Consulta: subjectFacets:"Laying hens"
Registros recuperados: 59
Data/hora: 06/06/2024 02:24:27

AN EVALUATION OF THE THERMAL AND LUMINOUS ENVIRONMENT OF LAYING HEN AVIARIES EQUIPPED WITH LIGHT-EMITTING DIODE AND COMPACT FLUORESCENT LAMPS AND THEIR EFFECTS ON PRODUCTION AND EGG QUALITY
Provedor de dados: 70
Autores: Ribeiro,Priscilla A. P.; Yanagi Junior,Tadayuki; Lima,Renato R. de; Oliveira,Daniela D. de; Abreu,Lucas H. P.
ABSTRACT The thermal and luminous conditions in aviaries affect the production and quality of eggs. Thus, the aim of the present study was to evaluate the thermal and luminous environment of commercial laying hen aviaries equipped with compact fluorescent (CF) and light-emitting diode (LED) lamps and their influence on egg production and quality. The study was carried out in two commercial laying hen facilities with similar construction features and management. The first facility was illuminated with CF lamps and the second with LED lamps. The thermal environment was assessed via air temperature, air relative humidity, and enthalpy. The evaluated lamps provided a similar thermal environment in both facilities. The aviary equipped with LED lamps showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal environment; Artificial lighting; Laying hens.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000100001

Oviduct-specific expression of tissue plasminogen activator in laying hens
Provedor de dados: 74
Autores: Kaleri,Hubdar Ali; Xiang,Liu; Aniwashi,Jueken; Xu,Shiyong.
Egg-laying hens are important candidate bioreactors for pharmaceutical protein production because of the amenability of their eggs for protein expression. In this study, we constructed an oviduct-specific vector containing tissue plasminogen activator (tPA) protein and green fluorescent protein (pL-2.8OVtPAGFP) and assessed its expression in vitro and in vivo. Oviduct epithelial and 3T3 cells were cultured and transfected with pL-2.8OVtPAGFP and pEGP-N1 (control vector), respectively. The pL-2.8OVtPAGFP vector was administered to laying hens via a wing vein and their eggs and tissues were examined for tPA expression. The oviduct-specific vector pL-2.8OVtPAGFP was expressed only in oviduct epithelial cells whereas pEGP-N1 was detected in oviduct epithelial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Green fluorescent protein; Human tissue plasminogen activator; Laying hens; Oviduct-specific expression.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000200011

MANUAL de manejo das poedeiras coloniais de ovos castanhos: Embrapa 051.
Provedor de dados: 14
Características das poedeiras Embrapa 051: As poedeiras coloniais Embrapa 051 são galinhas híbridas, resultantes do cruzamento entre linhas Rhode Island Red e Plymouth Rock Branca, selecionadas na Embrapa Suínos e Aves. Essas galinhas são especializadas para produção de ovos de mesa casca marron e por serem rústicas se adaptam bem aos sistemas menos intensivos, como parques.
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Poedeira Embrapa 051; Brown eggs; Ovo castanho; Galinha para postura; Galinha caipira; Produção animal; Poultry production; Laying hens; Egg shell formation.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1026304

10 procedimentos básicos para o controle de Salmonella em granjas de postura comercial.
Provedor de dados: 14
Autores: DUARTE, S. C.; GASPAR, L. F.; OLMOS, A. R.; FORTES, F. B. B.
bitstream/item/156490/1/final-8399novo.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Poedeira.; Sanidade animal; Galinha para postura; Granja; Salmonella.; Animal health; Laying hens; Aviaries.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1064907

Ninho adaptado para galinhas poedeiras.
Provedor de dados: 14
Autores: SAATKAMP, M. G.; AVILA, V. S. de.
bitstream/item/145677/1/final8201.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Galinha para postura; Instalação para animal; Ninho; Poultry housing; Laying hens; Nests.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1049374

Modeling energy utilization in broiler breeders, laying hens and broilers
Provedor de dados: 89
Autores: Sakomura,NK.
The factorial approach has been used to partition the energy requirements into maintenance, growth, and production. The coefficients determined for these purposes can be used to elaborate energy requirement models. These models consider the body weight, weight gain, egg production, and environmental temperature to determine the energy requirements for poultry. Predicting daily energy requirement models can help to establish better and more profitable feeding programs for poultry. Studies were conducted at UNESP-Jaboticabal to determine metabolizable energy (ME) requirement models for broiler breeders, laying hens, and broilers. These models were evaluated in performance trials and provided good adjustments. Therefore, they could be used to establish...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broilers; Broiler breeders; Energy metabolism; Energy requirement; Factorial approach; Laying hens; Modeling.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2004000100001

Pearl millet utilization in ccommercial laying hen diets formulated on a total or digestible amino acid basis
Provedor de dados: 89
Autores: Filardi,RS; Junqueira,OM; Casartelli,EM; Laurentiz,AC; Duarte,KF; Assuena,V.
An experiment was carried out to evaluate the effect of replacing corn with pearl millet in commercial layer diets, formulated according to the minimal requirements for total and digestible amino acids. Two hundred and forty Lohmann LSL laying hens with 25 weeks of age were distributed in a completely randomized experimental design according to a 2 x 5 factorial arrangement with 3 replicates of 8 birds. Feed was formulated on two amino acid basis (total or digestible) according to Rostagno et al. (2000) and there were five pearl millet inclusion levels (0%, 25%, 50%, 75%, and 100%). Performance and egg quality were evaluated during five periods of 21 days.At the end of each period, feed intake, egg production, egg weight and feed conversion were evaluated....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestible amino acids; Egg quality; Laying hens; Pearl millet; Performance; Total amino acids.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000200006

Effect of feeding whole linseed as a source of polyunsaturated fatty acids on performance and egg characteristics of laying hens kept at high ambient temperature
Provedor de dados: 89
Autores: Ahmad,S; Ahsan-ul-Haq,; Yousaf,M; Kamran,Z; Ata-ur-Rehman,; Sohail,MU; Shahid-ur-Rahman,.
The present study was conducted to evaluate the effects of feeding whole linseed on the laying performance and egg characteristics in laying hens kept at high ambient environmental temperatures (average 34 ºC; the diurnal temperature range 26 ºC to 41 ºC). Two hundred and forty 38-wk-old white Leghorn laying hens were fed diets containing 0, 5, 10 or 15% whole linseed (as a source of n-3 polyunsaturated fatty acids) for a period of 12 weeks. Egg production was recorded daily, while feed intake and egg characteristics were monitored on weekly basis. The results of the study demonstrated that egg production and feed intake decreased, while feed conversion ratio (FCR) per dozen of eggs increased (p &lt; 0.05) with increasing dietary linseed levels. Egg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Linseed; N-3 PUFA; Laying hens; Hot climate; Performance.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000100004

Severe Outbreak of Avian Encephalomyelitis in Laying Hens in Northeastern Brazil
Provedor de dados: 89
Autores: Rocha,PMC; Barros,MEG; Rocha,BP; Souza,FAL; Mendonça,FS; Evêncio-Neto,J.
ABSTRACT This paper describes the epidemiological, clinical and pathological aspects of an avian encephalomyelitis (AE) outbreak in commercial laying hens in Northeastern Brazil. The disease affected 23,409 layers (from day one until 100 weeks) leading to mortality of 16.5% (5,049/30,600) of the flock. Twenty laying hens were clinically examined, and blood samples were collected and tested by Enzyme-Linked Immunosorbent Assay (ELISA). Five laying hens with neurological signs were necropsied and samples of the brain, cerebellum, spinal cord, sciatic nerve, heart, ceca tonsils, proventriculus and liver were collected, fixed in formalin buffered solution and processed according to routine methods for histological examination. Clinical signs were observed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avian encephalomyelitis; Birds; Laying hens; Nonsuppurative encephalomyelitis; Vaccination.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000200305

Effect of the calcium level and limestone particle size on the performance of semi-heavy layers in the second cycle of egg production
Provedor de dados: 89
Autores: Pizzolante,CC; Garcia,EA; Laganá,C; Saldanha,ESPB; Deodato,AP; Faitarone,ABG; Scherer,MR; Batista,L.
An experiment was carried out at the Research and Development Unit of Brotas aiming at evaluating dietary calcium level and limestone particle size on the production performance of commercial (Hy-Line Brown) layers in the second lay cycle. Experiment duration was 112 days. A total number of 288 hens, with 83 weeks of age in the beginning of the experiment, were used in a completely randomized experimental design in a factorial arrangement of 2x3, with two calcium levels (3.5 and 4.0%) and three limestone particle size compositions: 100% fine limestone (FL), 30% coarse limestone (CL) + 70% fine limestone (FL), and 50% (CL) + 50% (FL), with six replicates of eight birds each. Egg weight (g), egg production (%), egg mass (%), feed intake (g), feed conversion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcium; Laying hens; Limestone; Particle size; Performance.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000300006

Effect of cage density on the performance of 25- to 84-week-old laying hens
Provedor de dados: 89
Autores: Rios,RL; Bertechini,AG; Carvalho,JCC; Castro,SF; Costa,VA.
Three experiments were carrie out to evaluate the influence of cage density on the performance of 25- to 84-week-old laying hens. Forty hundred Lohmann-LSL layers were distributed in cages (100x40x 45x50cm) according to a completely randomized experimental design with split plot in time.Three treatments (10, 12, or 14 hens per cage, corresponding, to 450, 375, and 321cm²/bird, respectively), with 15 assessment periods (four weeks each), and eight replicates per treatment were applied. Considering that layer's production cycle is affected by age, three experimental trials (25 to 44; 45 to 64 and 65 to 84 weeks of age) were carried out, and the data collected in each trial was individually analyzed. Increasing cage density significantly reduced feed intake...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Birds per cage; Cage density; Egg production; Laying hens.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2009000400007

Dietary Lactic Acid Bacteria Modulate Yolk Components and Cholesterol Metabolism by Hmgr Pathway in Laying Hens
Provedor de dados: 89
Autores: Deng,Q; Shi,H; Luo,Y; Liu,N; Deng,X.
ABSTRACT This study aimed to investigate the effect of dietary lactic acid bacteria (LAB) on egg production, yolk components, cholesterol metabolism, and enterohepatic circulation of bile acids in hens. Four treatment diets included a control and LAB added at 3 × 105 (low), 3 × 107 (medium), or 3 × 109 (high) cfu/kg. The treatment LAB contained equal amounts of Lactobacillus acidophilus, Lactobacillus plantarum, and Enterococcus faecium. Results showed that high LAB increased (p&lt;0.05) laying rate, egg mass, and yolk phospholipid, but decreased (p&lt;0.05) yolk triglyceride and phosvitin. Diets with LAB decreased (p&lt;0.05) yolk and serum cholesterol content, and serum bile acid by 9.3 to 39.9%. In liver, high LAB downregulated (p&lt;0.05) mRNA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cholesterol metabolism; HMGR pathway; Lactic acid bacteria; Laying hens; Yolk components.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2020000300303

Cobalt and vitamin B12 in diets for commercial laying hens on the second cycle of production
Provedor de dados: 89
Autores: Kato,RK; Bertechini,AG; Fassani,EJ; Santos,CD; Dionizio,MA; Fialho,ET.
The supplementation of cobalt and vitamin B12 in diets for commercial laying hens on the second production cycle was studied. Four hundred and eighty light commercial laying hens, Lohmann LSL, were used at initial phase of forced molting laying period. The trial was conducted in a randomized design. The plots were the treatments which were constituted by combination of five cobalt levels (0.00; 0.30; 0.60; 0.90 and 1.20ppm) and two vitamin B12 levels (without and with 10µ/kg), and the split-plots were four periods (21, 42, 63 and 84 days) during the second period of production, with 4 repetitions and 12 hens per experimental unit. Food and water were provided ad libitum and eggs were collected twice daily. Performance and egg quality parameters were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cobalt; Egg production; Laying hens; Nutrition; Vitamin B12.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000100006

Effect of Dietary Inclusion of Leucaena (Leucaena leucocephala) and Banana Flour (Musa cavendishii) on Performance of Laying Hens
Provedor de dados: 89
Autores: Dumorné,K.
ABSTRACT The aim of the present study was to evaluate the effects of Leucaena (Leucaena leucocephala) and Banana flour (Musa cavendishii) on performance of laying hens. Fifty laying hens (3 months of age) were randomly distributed into five experimental groups, each consisting of 10 laying hens. The groups were control (10 laying hens); L6 (Leucaena, 6 g/day (10 laying hens)); L8 (Leucaena, 8.0 g/day (10 laying hens)); L10 (Leucaena, 10 g/day (10 laying hens)); and L12 (Leucaena, 12 g/day (10 laying hens)), in addition, five levels of Banana flour control (10 laying hens); 25% (10 laying hens); 50%, (10 laying hens); 75% (10 laying hens); and 100% (10 laying hens), were assessed respectively. The experimental period lasted from 4 to 8 weeks. The results of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal diet; Banana flour; Laying hens; Leucaena.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000400725

Infectious laryngotracheitis: a review
Provedor de dados: 89
Autores: Hidalgo,H.
Infectious laryngotracheitis (ILT) herpesvirus continues to cause outbreaks of respiratory disease in chickens world-wide. Sporadic cases of ILT occur in all classes of birds, including hobby/show/game chickens, broilers, heavy breeders, and commercial laying hens. These epornitics of ILT tend to occur where there are large populations of naïve, unvaccinated birds, i.e., in concentrated areas of broiler production. ILT virus can be transmitted through (a) chickens with acute upper respiratory tract disease, (b) latently infected "carrier" fowls, and (c) fomites and contaminated persons. Chicken flocks which are endemic infected with ILT virus occur only in some regions of countries or even in particular multiple-age production farms. In these cases...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosecurity; Broiler breeders; ILT virus; Laryngotracheitis; Laying hens; Vaccines.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000300001

Dietary Effects of Natural Polyphenol Antioxidant on Laying Performance and Egg Quality of Laying Hens Fed Diets with Oxidized Oil
Provedor de dados: 89
Autores: Lee,HH; Kim,DH; Lee,KW; Kim,KE; Shin,DE; An,BK.
ABSTRACT This study was conducted to investigate the effects of dietary oxidized oil and natural polyphenol antioxidants on laying performances and egg quality of laying hens. A total of two hundred, 61-week-old Lohmann Brown laying hens were divided into five groups, consisting in four replicates of 10 birds each. They were fed one of the five experimental diets (fresh oil only, oxidized oil without antioxidants, oxidized oil with vitamin E 200 ppm, oxidized oil with vitamin E 100 ppm + Cabanin CSDⓇ 100 ppm, oxidized oil with Cabanin CSDⓇ 500 ppm)respectively, for 6 weeks. There were no significant differences in laying performances and egg weight among the treatments. However, egg mass in group fed oxidized oil with vitamin E 100 ppm + Cabanin CSDⓇ 100...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laying hens; Oxidized oil; Natural antioxidants; Vitamin E; Egg quality.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000100319

Requirement of Digestible Sulfur Amino Acids in Laying Hens Fed Sorghum- and Soybean Meal-Based Diets
Provedor de dados: 89
Autores: Gomez,RS; Angeles,ML.
ABSTRACT Two experiments were done to evaluate the effect of increasing levels of dietary digestible methionine (Met) and Met:cysteine (Met:Cys) ratio on the productivity of Hy-Line W-36 laying hens fed sorghum- and soybean meal-based diets. In Exp. 1, 160 hens from 68 to 75 weeks of age were assigned to four dietary levels of digestible Met (0.20 0.24, 0.28 and 0.32%). The digestible total sulfur amino acids:Lysine (TSAA:Lys) ratios were: 62, 68, 76 and 84%. In Exp. 2, 192 hens from 76-83 weeks of age were assigned to four dietary digestible Met:Cys ratios (160, 116.7, 85.7 and 62.5%). The digestible TSAA:Lys ratio was kept constant across diets (80%). Results were subjected to ANOVA and linear regression analyses. In Exp. 1, optimal egg production, egg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laying hens; Requirements; Methionine; Cysteine; Productivity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000200231

Physical-Chemical Characteristics of Designer and Conventional Eggs
Provedor de dados: 89
Autores: Kralik,Z; Kralik,G; Grčevi&amp;#263;,M; Kralik,I; Gantner,V.
ABSTRACT The objective of this study was to compare the internal and external quality of conventional and designer eggs. In total, 120 Tetra SL laying hens were randomly allotted to two treatments (K and P groups), with 12 replicates of five hens each. The control group (K) was fed a standard layer diet, producing conventional eggs, and the P group was fed a modified diet supplemented with 5% of an oil mixture, 0.5 mg organic selenium/kg, 200 mg lutein/kg and 200 mg vitamin E/kg, producing designer eggs. Treatments did not influence (p&gt;0.05) egg weight or egg component weights. Designer eggs presented higher albumen proportion and lower eggshell proportion than conventional eggs (p&lt;0.01). Relative to egg quality parameters, designer eggs presented...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Designer eggs; Haugh units; Laying hens; PH; TBARS.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000100119

Climate Change in Layer Poultry Farming: Impact of Heat Waves in Region of Bastos, Brazil
Provedor de dados: 89
Autores: Lamarca,DSF; Pereira,DF; Magalhães,MM; Salgado,DD.
ABSTRACT The region around the municipality of Bastos, state of São Paulo, accounted for about 7% of Brazilian egg production in 2015. In 2012, it experienced a heat wave that resulted in the death of approximately 500,000 hens, according to information released at the time. Considering the impact of heat waves on layer mortality, the objective of this study was to analyze how heat waves impact the layer farming in the region of Bastos, considering the climate change scenarios forecasted by the IPCC for the next years. This study was conducted in three stages: i) analysis of the IPCC reports to understand climate change scenarios; ii) analysis of historical temperature data in the region of Bastos; iii) analysis of how climate change, through heat waves,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg production; Extreme event; IPCC; Laying hens; Mortality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000400657

Effects of Flammulinavelutipes Stem Base on Microflora and Volatile Fatty Acids In Caecum of Growing Layers under Heat Stress Condition
Provedor de dados: 89
Autores: Wang,S; Mahfuz,S; Song,H.
ABSTRACT The present study was undertaken to investigate the effects of Flammulinavelutipes stem base (FVS) on growth performance, microbial flora and volatile fatty acids of growing layers under heat stress condition. A total of 72 ISA Brown hens were randomly divided into six treatments: thermoneutral temperature control group (CON), heat stress control group (HS), heat stress antibiotic group (ANT) as positive control and heat stress FVS groups (20, 40 or 60 g/kg FVS). The experimental period had a duration of 28 d (days 84-112). On day 98, daily gain average was significantly higher (p&lt;0.05) in the FVS groups than in the HS group. The number of bands in the FVS groups were higher (p&lt;0.05) than in the HS group on day 98. The microbial similarity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laying hens; Thermal stress; Microbial flora; Mushroomstembase; Short chain fatty acids.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000400303

Infection of commercial laying hens with Salmonella Gallinarum: clinical, anatomopathological and haematological studies
Provedor de dados: 89
Autores: Freitas Neto,OC; Arroyave,W; Alessi,AC; Fagliari,JJ; Berchieri,A.
This study aimed at evaluating the susceptibility of commercial laying hens to Salmonella Gallinarum (SG). Two experiments were carried using a mutant strain of Salmonella Gallinarum resistant to nalidix acid (SGNALr). In the first trial, the resistance of birds was evaluated based on clinical signs, faecal shedding, and mortality. It was carried out with six lines of commercial layers being three light white layers, considered to be resistant to SG (W1, W2, W3), and three semi-heavy brown varieties (B1, B2, B3), considered susceptible to SG. Each group contained 15 one-day-old birds. Hens were inoculated in the crop at 5 days of age with 0.2 mL of SGNALr neat culture. In addition, to each brown variety, a new group of 15 birds was challenged with 0.2mL of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fowl typhoid; Hematology; Laying hens; Salmonella Gallinarum; Susceptibility.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2007000200010

Comparison of the Dietary Supplementation of Lactobacillus plantarum, and Fermented and Non-Fermented Artemisia Annua on the Performance, Egg Quality, Serum Cholesterol, and Eggyolk-Oxidative Stability During Storage in Laying Hens
Provedor de dados: 89
Autores: Lee,AR; Niu,KM; Lee,WD; Kothari,D; Kim,SK.
ABSTRACT Artemisia annua L. is a widely distributed medicinal plant and well-known for treating malaria due to the artemisinin content. We previously found enhanced antioxidant and antibacterial activities of Lactobacillus plantarum-fermented A. annua dried leaves in vitro. The present study compared the effects of the dietary supplementation of L. plantarum, fermented (FA) or non-fermented (NFA) A. annua on laying performance, egg quality, serum cholesterol, and egg yolk oxidative stability during storage in 40-weeks-old Hy-Line Brown layers. In total, 180 layers were randomly allocated into four treatments for 6 weeks: basal diet (CON), basal diet + 0.5% L. plantarum only (LO), basal diet + 0.5% NFA, and basal diet + 0.5% FA. Each treatment comprised...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artemisia annua L; Egg quality; Lactobacillus plantarum; Laying hens; Malondialdehyde.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000400311

Standardization of A Sample-Processing Methodology for Stable Isotope Studies in Poultry
Provedor de dados: 89
Autores: Denadai,JC; Sartori,JB; Pezzato,AC; Costa,VE; Sartori,MMP; Petinati,BES; Gennari,RS; Silva,ET; Carvalho,MAG; Ishizuka,AND.
ABSTRACT The objective of this study was to determine if lipid extraction processes alter the isotopic value of δ13C and δ15N of tissues (pectoral muscle, thigh and liver) and eggs and if the use of anticoagulants interferes with blood and plasma δ13C and δ15N isotopic values. Samples were acquired from the same flock of birds. The 32 egg samples were randomly divided into four treatments (liquid, dehydrated, and fat-extracted with ether or chloroform + methanol) with eight replicates each. The 24 samples of pectoral muscle, thigh muscle and liver of broilers were randomly divided into three treatments (dehydrated, fat-extracted with ether and chloroform + methanol) with eight replicates each. Blood samples were divided into a 3x3 factorial arrangement...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon-13; Broilers; Nitrogen-15; Laying hens.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000100302

Mathematical Model to Compare Egg Production C
Provedor de dados: 89
Autores: Fialho,FB; Ledur,MC; Avila,VS.
A segmented polynomial model was used on several egg production curves in an attempt to analyze the differences between the curves in a more descriptive manner. Production curves from different commercial and experimental genetic lines of layers were used. The parameters of the model include the age and level of peak production, rate of decrease in production after the peak and time between start and peak of production. These and other derived variables were compared between the curves using contrasts. The methodology used allowed an easier interpretation of the curves, and the detection of differences in sexual maturity, uniformity and peak of production. This work validates the segmented polynomial model for use in future research dealing with analysis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg production; Layers; Laying hens; Model.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2001000300002

Effects of Arginine Supplementation on Organ Development, Egg Quality, Serum Biochemical parameters, and Immune Status of Laying Hens
Provedor de dados: 89
Autores: Yang,H; Ju,X; Wang,Z; Yang,Z; Lu,J; Wang,W.
Abstract This experiment was conducted to study the effects of arginine supplementation on organ development, egg quality, blood parameters, and immune status of laying hens. A total of 360 25-week-old brown Leghorn laying hens were randomly divided into three groups with six replicates of 20 birds each and fed diets supplemented with 0, 8.5, or 17 mg of L-arginine/kg for 42 days. Results showed that the weight of proventriculus and duodenum in the treatment supplemented with 17 mg/kg L-arginine was heavier than that of 0 mg L-arginine/kg treatment (p&lt;0.05). The weight of oviduct in the treatments supplemented with 17 mg/kg L-arginine was smaller than that of 0 and 8.5 mg L-arginine/kg treatment (p&lt;0.05), and the small yellow follicle amount in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arginine; Clinical blood parameters; Immune status; Laying hens; Organs development.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000100181

Effect of Plant Essential Oil on Growth Performance and Immune Function During Rearing Period in Laying Hens
Provedor de dados: 89
Autores: Gao,J; Liu,W; Geng,B; Lei,Q; Han,H; Zhou,Y; Liu,J; Cao,D; Li,H; Li,F.
ABSTRACT The effects of plant essential oil (PEO) on the production performance and immune function of laying hens were evaluated to provide theoretical basis for promoting the natural plant extracts. Eight thousand 1-day-old healthy laying hens were randomly divided into a control group or PEO group, with four replicates per treatment and 1000 hens per replicate. The PEO diet was supplemented with 3g/kg plant extract. Diets were fed for 56 days. The tibia length and keel length were detected on an empty stomach at the end of the trial. Blood samples were collected on the 28th and 56th days to detect the level of C3, C4, IL-1, IL-2, IL-17 and immunoglobulin in the serum. The results showed that, compared with the control, PEO supplementation significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laying hens; Plant essential oil; Production performance; Immune function.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2020000300301

Evaluation of genetic divergence among lines of laying hens using cluster analysis
Provedor de dados: 89
Autores: Barbosa,L; Regazzi,AJ; Lopes,PS; Breda,FC; Sarmento,JLR; Torres,RA; Torres Filho,RA.
Cluster analysis was used to investigate the genetic divergence among five lines of laying hens. The following traits were evaluated: body weight at 40, 48 and 56 weeks of age; egg weight at 40, 44, 52 and 60 weeks of age; and laying rate from 40 to 60 weeks of age. Three groups were formed when data were analyzed by the single-linkage hierarchical method using squared Mahalanobis distance (D²) as dissimilarity measures: one group comprised lines 3 and 5, the second group line 1, and the third group comprised lines 2 and 4. Using Tocher's optimization method, only two groups were formed: one group comprised lines 3, 5 and 1, and the second comprised lines 2 and 4. This evidences the disagreement between the methods over the evaluation of genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laying hens; Mahalanobis distance; Single linkage; Tocher's optimization method.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000200003

Modelling energy utilization for laying type Pullets
Provedor de dados: 89
Autores: Neme,R; Sakomura,NK; Fialho,FB; Freitas,ER; Fukayama,EH.
Three trials were carried out to determine energy metabolized (EM) requirement model for starting and growing pullets from different strains, at five ambient temperatures and different percentage feather coverage. In Trial I, metabolizable energy requirements for maintenance (MEm) and efficiency of energy utilization were estimated using 64 birds of two different strains, Hy-Line W36 (HLW36) and Hy-Line Semi-heavy (HLSH), from 9 to 13 weeks of age. The effects of ambient temperature (12, 18, 24, 30 and 36ºC) and percentage feather coverage (0, 50 and 100%) on MEm were assessed in the second trial, using 48 birds per temperature per strain (HLSH and HLW36) from 9 to 13 weeks of age. Trial III evaluated ME requirements for weight gain (MEg) using 1,200 birds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body composition; Energy requirements; Feather coverage; Laying hens; Model; Temperature.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000100007

Technical and Economic Efficiency of Laying Hen Farms in Konya, Turkey
Provedor de dados: 89
Autores: Dogan,N; Kaygisiz,F; Altinel,A.
ABSTRACT This study was carried out to determine the technical and economic efficiency levels of laying hen farms and factors affecting the efficiency scores. For this purpose, a personal interview was carried out. Technical and economic data of 39 laying hen farms consisting their inputs and outputs over the period 2013-2015 was formed the material of this study. Efficiency levels were estimated by using Data Envelopment Analysis (DEA). Mean technical efficiency score of the enterprises were determined as 98.6%. Also 48.7% of the enterprises were determined fully technical efficient. On the other hand, mean economic efficiency of the enterprises was determined as 88.8%, while only 17.9% of the enterprises were fully economic efficient. In order to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Data envelopment analysis; Economic analysis; Efficiency; Laying hens; Tobit regression.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000200263

The Effect of Supplementing Tea Polyphenols in Diet of Laying Hens on Yolk Cholesterol Content and Production Performance
Provedor de dados: 89
Autores: Wang,Y; Yang,Q; Lin,P; Li,C; Lu,Y; Daijun,S.
ABSTRACT This study was conducted to evaluate the influence of supplementing tea polyphenols (TP) in diet of laying hens on yolk cholesterol content and production performance. A total of 1800 Lohmann laying hens aged 48 weeks were randomly allocated to 6 groups. Each group consisted of 6 replicates with 50 layers. The feeding experiment was 4 weeks including one-week acclimatization. Layers fed basal diet supplemented with 0, 150, 200, 250, 300 and 350 mg TP/kg diet, respectively. The results showed that average daily feed intake (ADFI), feed conversion ratio (FCR), average egg weight (AEW), laying rate and the indicators of egg quality were not significantly affected by the diet supplemented with 300 mg/kg TP (p&gt;0.05). However, yolk cholesterol...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Laying hens; Production performance; Tea polyphenols; Yolk cholesterol content.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2021000200302

Layer Performance Recovery After Feeding Amino Acid-deficient Diets
Provedor de dados: 89
Autores: Faria,DE; Harms,RH; Russell,GB.
Three hundred and twenty Hy-Line W36&lt;FONT FACE=Symbol&gt;Ò&lt;/FONT&gt; commercial laying hens, 39 weeks of age, were used to determine the sequence and the length of time needed for hens to recover performance characteristics after an eight-week period under graded levels of threonine deficiency. Eight experimental diets with Thr levels ranging from 0.35 to 0.53% were randomly fed with eight replicates of five hens each. After the previous experiment, the hens were fed a control diet (0.53% Thr) for a four-week period. Feed consumption (FC), energy intake (EI), egg production (EP), egg weight (EW), egg mass (EM), and body weight (BW) were evaluated. All performance characteristics were impaired on Thr deficient diets. The recovery sequence order was FC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amino acid deficiency; Egg production; Laying hens; Threonine.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2002000200007

Egg quality in layers housed in different production systems and submitted to two environmental conditions
Provedor de dados: 89
Autores: Barbosa Filho,JAD; Silva,MAN; Silva,IJO; Coelho,AAD.
The production system using cages is a highly polemical issue in Europe, because of the space restriction imposed to laying hens. It is considered that the cage system might compromise important comfort movements, welfare and egg quality. This study evaluated egg quality and welfare of two strains of hens housed in a conventional system (battery laying cages) or litter system with nest and perches, and submitted to heat stress or comfort conditions. Two groups of 20 birds (10 Hy-line W36 and 10 Hy-line Brown) were submitted to two environmental conditions (26°C and 60% RH or 35°C and 70% RH) and two housing systems (cages or litter) in the early production phase. Egg quality was analyzed based on egg weight, eggshell thickness, specific gravity, and Haugh...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg quality; Environment; Housing systems; Laying hens.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000100003

Economic effects of avian influenza on egg producers in Turkey
Provedor de dados: 89
Autores: Demircan,V; Yilmaz,H; Dernek,Z; Bal,T; Gül,M; Koknaroglu,H.
This study determined the economic effects of avian influenza on the egg-production sector of Afyon Province, Turkey. Economic indicators were compared before and during the avian influenza outbreak. A questionnaire was conducted with 75 poultry farmers. Farms were divided into three groups according to their size. The profitability of the three farm size groups was compared during two study periods: before and during the avian influenza outbreak. The results indicate that, as compared to previous levels, farms experienced significantly reduced incomes during the avian influenza episode. While net income and profit margin were found to be negative in all three farm groups during the avian influenza period, only group I showed economic loss prior to avian...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avian influenza; Economic analysis; Laying hens.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2009000300010

Performance, Body Temperature and Egg Quality of Laying Hens Fed Vitamins D and C Under Three Environmental Temperatures
Provedor de dados: 89
Autores: Faria,DE; Junqueira,OM; Souza,PA; Titto,EAL.
Three experiments were conducted in a climatic chamber to determine the effects of vitamins D3 and C supplementation on performance, body temperature, and egg quality under thermoneutral temperature (24.8º to 27.0º C), a cyclic heat stress (26.2º C for 16 h and 32.1º C for 8 h) and a constant heat stress (30.0º to 32.0º C) for three weeks in each temperature. One hundred forty-four White Leghorn hens aged 31 weeks were used in a completely randomized design with a factorial arrangement of 3 x 3: vitamin D3 (2,500, 3,000, and 3,500 IU/kg) and vitamin C (0, 200, and 400 ppm), with a total of nine treatments with four replicates of four hens each. Parameters measured included feed intake (FI), feed:gain (FG), egg production (EP), egg weight (EW), egg mass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascorbic acid; Cholecalciferol; Egg; Heat stress; Laying hens.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2001000100005

ACTIVITY OF SOME BRAZILIAN ISOLATES OF ENTOMOPATHOGENIC FUNGI AGAINST THE POULTRY RED MITE DERMANYSSUS GALLINAE DE GEER (ACARI: DERMANYSSIDAE)
Provedor de dados: 89
Autores: Kasburg,CR; Alves,LFA; Oliveira,DGP; Rohde,C.
ABSTRACT Poultry red mite Dermanyssus gallinae is a cosmopolitan and hematophagous species commonly found in layer houses around the world. Poultry mite infestations may cause anemia, stress, low body weight and egg production, and mortality. Mite control is typically based on chemical products, but they are not effective and leave residues in eggs; therefore, alternative control methods, such as entomopathogenic fungi, need to researched. This study aimed at evaluating, in the laboratory, the activity of Brazilian isolates of entomopathogenic fungi against D. gallinae. The mites were collected from a commercial layer house and were sprayed with conidial suspensions (1 × 108 conidia/mL) of five isolates of Beauveria bassiana and Metarhizium anisopliae. All...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hematophagous mites; Microbial control; Ectoparasites; Laying hens.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000300457

Occurrence of Salmonella sp in laying hens
Provedor de dados: 89
Autores: Gama,NMSQ; Berchieri Jr,A; Fernandes,SA.
This study was carried out to investigate the presence of Salmonella sp in flocks of white laying hens. In different farms, the transport boxes of twelve flocks were inspected at arrival for the presence of Salmonella. Four positive (A, B, L and M) and one negative (I) flocks were monitored at each four weeks using bacteriological examination of cecal fresh feces up to 52 weeks. Birds were also evaluated at 52 weeks, when 500 eggs were taken randomly, and at 76 weeks, after forced molt. Salmonella enterica serovar Enteritidis and S. enterica rough strain were isolated from the transport boxes of the four positive flocks (flocks A, B, L and M). Salmonella sp was not isolated from the transport boxes or from the feces after 76 weeks-old in flock I....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eggs; Feces; Laying hens; Salmonella.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000100002

Effect of Ultra-fine Traditional Chinese Medicine Compounds on Regulation of Lipid Metabolism and Reduction in Egg Cholesterol of Laying Hens
Provedor de dados: 89
Autores: Song,Y; Zhu,J; Wang,T; Zhang,C; Yang,F; Guo,X; Liu,P; Cao,H; Hu,G.
ABSTRACT This study has the objective of investigating the effects of traditional Chinese medicine prescriptions (TCM) on serum lipid, abdominal and hepatic fat percentage, cholesterol content in eggs, and mRNA expression of genes apoA I and apoB100. One hundred and thirty five healthy (300-day-old) layers were randomly assigned to three treatments. The hens in control group were fed with the basal diet. The hens in the experimental groups (TCM 1 and TCM 2) were fed with the basal diet supplemented with 1% TCM 1 and 1% TCM 2 respectively over a period of 60 days. Laying performance and the serum parameters relevant to fat metabolism were measured. The results showed that no significant differences were found in average daily feed intake and egg weight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laying hens; Cholesterol; Traditional Chinese medicine; Lipid metabolism; Apolipoprotein.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000100153

Effect of oils sources on blood lipid parameters of commercial laying hens
Provedor de dados: 89
Autores: Murata,LS; Ariki,J; Machado,CR; Silva,L da PG da; Rezende,MJM.
The experiment was carried out to verify if total cholesterol, HDL-cholesterol and triacylglicerol plasma levels are affected when laying hens are fed rations containing different dietary oil sources. One hundred sixty 50 week-old hens, assigned to four treatments with five replicates using 8 hens per replicate were used. The experimental period was of 84 days divided in 3 cycles of 28 days each. In the last day of each cycle, blood samples of 2 hens per replicate were randomly choose and blood samples were collected. On the other hand, blood was also collected at 7 am, 11 am and 3 pm aiming to study the daily changes of these lipids. Blood lipid parameters were not affected by different dietary oil sources (p &gt; 0.05); however, HDL-cholesterol did...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Blood lipids; Diet; Laying hens; Oil source.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000300008

Assessment of Egg Quality in Native and Foreign Laying Hybrids Reared in Different Cage Densities
Provedor de dados: 89
Autores: Ozenturk,U; Yildiz,A.
ABSTRACT This study aimed to compare the eggs of the native-Turkish Atak-S (A-S) hybrid and the foreign brown layer Isa Brown (IB) and white layer Novogen White (NW) hybrids reared in two different cage densities (468.75 cm2/hen and 312.50 cm2/hen) in terms of the internal and external quality parameters of the eggs. A total of 540 hens including 180 from each genotype were used. To determine the egg quality characteristics, one randomly selected egg was taken out of each cage every 4 weeks in the yield period of 24-68 weeks, and analysis were carried out. A total of 648 eggs were used. In the study, the effect of genotype on all parameters was found to be significant. The shell thickness, Haugh unit and albumen index were lower in the Atak-S hybrid. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Age; Atak-S; Cage density; Egg quality; Laying hens.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2020000300313

Effect of Fennel (Foeniculum Vulgare Mill.) Used as a Feed Additive on The Egg Quality of Laying Hens Under Heat Stress
Provedor de dados: 89
Autores: Gharaghani,H; Shariatmadari,F; Torshizi,MA.
In this study, one hundred and twenty 40-wk-old White Leghorn laying hens were submitted to two different thermal conditions (24° C vs. 34° C) and were fed three levels (0, 10, or and 20 g/kg of diet)of fennel fruits (Foeniculum vulgare Mill.) as a feed additive in. This study was carried out according to a factorial design consisting of two temperatures and three fennel levels with five 5 replicates each (n = 2 × 3 × 5). Performance, egg production, egg quality, and oxidative product levels (malondialdehyde, MDA, and carbonyl) in the eggs were measured before and after heat exposure. The results showed that the tested temperatures did not affect egg production (p&gt;0.05), but the production of eggs with broken shell and feed intake were affected by heat...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fennel; Heat stress; Laying hens; Antioxidant; Feed.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000200199

Utilization of sunflower seed in laying hen rations
Provedor de dados: 89
Autores: Tsuzuki,ET; Garcia,ER de M; Murakami,AE; Sakamoto,MI; Galli,JR.
The objective of this trial was to evaluate the effect of sunflower seed inclusion (0, 1.4, 2.8, 4.2 and 5.6%) in a laying hen diet containing corn, soybean meal, wheat meal and soybean oil as main ingredients on performance and egg quality. The evaluated variables were daily feed intake, average egg weight, feed conversion (kg.kg-1 and kg.dz-1), eggshell percentage, yolk color and Haugh unit. One hundred and sixty 25 week-old Lohmann laying hens were used in a completely randomized design with five treatments and four replications of eight birds per experimental unit. Four periods of 28 days were evaluated during 112 days. The inclusion of sunflower seed in the diet had no effect on production parameters during the experimental period. Thus, can be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg quality; Laying hens; Performance; Sunflower seed.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000300004

Occurrence and Epidemiology of Fannia Spp. (Diptera: Fanniidae) in Laying Poultry Farms in State of Minas Gerais, Brazil
Provedor de dados: 89
Autores: Rezende,LC; Oliveira,TM; Teixeira,CM; Oliveira,PR; Martins,NRS; Cunha,LM.
ABSTRACT Aspects related to epidemiology of flies belonging to Fannia genus were studied in order to determine predisposing factors for its occurrence in layer hens houses of commercial farms in the state of Minas Gerais, Brazil. An observational, analytical and sectional survey was conducted to verify major epidemiological aspects associated to infestations. This research was accomplished starting from an adapted secondary database of and structured with information on the presence and absence of ectoparasites and arthropods, characteristics of chicken houses, the poultry, type of facilities, geographical location and the management. The study was conducted in four hundred and thirty one houses located in forty three farms visited in 2012 year in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flies; Laying hens; Management of poultry manure.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000300419

Analysis of Behavioural Profile of Hens with the Use of Computer Software
Provedor de dados: 89
Autores: Rozempolska-Rucinska,I; Bownik,A; Prochniak,T; Zieba,G; Slaska,B; Kasperek,K; Kozak,A.
ABSTRACT The aim of the study was to evaluate the emotional reactivity of hens with the use of physical parameters such as movement velocity and position of the selected parts of the body analysed by computer software - Tracker®. 200 Rhode Island White hens kept individually in a laying hen breeding farm were used in the study. The analysis of hens behaviour was performed with the use of Novel Object Test. Afterwards the video clips were analysed to determine behavioural reactivity with the use of Tracker® software by analysis of two control points: the upper part of the head and the peak of the tail. The results suggest that it is possible to use Tracker® software for evaluation of hens behavioural profile and this sort of analysis enables to classify...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Emotional reactivity; Laying hens; Novel Object Test; Tracker® software.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000300413

Assessment of Egg Quality in Native and Foreign Laying Hybrids Reared in Different Cage Densities
Provedor de dados: 89
Autores: Ozenturk,U; Yildiz,A.
ABSTRACT This study aimed to compare the eggs of the native-Turkish Atak-S (A-S) hybrid and the foreign brown layer Isa Brown (IB) and white layer Novogen White (NW) hybrids reared in two different cage densities (468.75 cm2/hen and 312.50 cm2/hen) in terms of the internal and external quality parameters of the eggs. A total of 540 hens including 180 from each genotype were used. To determine the egg quality characteristics, one randomly selected egg was taken out of each cage every 4 weeks in the yield period of 24-68 weeks, and analysis were carried out. A total of 648 eggs were used. In the study, the effect of genotype on all parameters was found to be significant. The shell thickness, Haugh unit and albumen index were lower in the Atak-S hybrid. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Age; Atak-S; Cage density; Egg quality; Laying hens.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2020000400313

Salmonella serovars in laying hen flocks and commercial table eggs from a region of São Paulo state, Brazil
Provedor de dados: 89
Autores: Freitas Neto,OC de; Galdino,VMCA; Campello,P L; Almeida,AM de; Fernandes,SA; Berchieri Júnior,A.
Salmonella spp. is the main originator of human foodborne diseases worldwide and is mainly transmitted by food containing eggs. In Brazil, as a result of the lack of studies and data collection very little is known about the prevalence of Salmonella spp. in laying hen flocks and commercial table eggs. Consequently the present study was elaborated and aimed at generating data about Salmonella spp. in part of the Brazilian egg production chain. Eight flocks of day-old chicks, eight flocks of adult laying hens (four vaccinated with bacterin against Salmonella Enteritidis and four unvaccinated) and commercial table eggs from four supermarkets were examined. Salmonella spp. was isolated in 50 % of the newly hatched chicks, 25 % of the adult flocks and 1.5 % of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salmonella serovars; Laying hens; Chicks; Feces; Eggs.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2014000200008

Effect of dietary energy concentration on performance parameters and egg quality of white leghorn laying hens
Provedor de dados: 89
Autores: Ribeiro,PAP; Matos Jr,JB; Lara,LJC; Araújo,LF; Albuquerque,R; Baião,NC.
An experiment was carried out with 1200 23-week-old white Dekalb commercial laying hens to investigate production responses, egg quality, and energy utilization of laying hens fed different dietary energy levels at the beginning of lay. Birds were housed and divided in five groups of 240 birds according to dietary apparent metabolizable energy corrected for nitrogen (AMEn): 2700 kcal/kg; 2775 kcal/kg; 2850 kcal/kg; 2925 kcal/kg; and 3000 kcal/kg, with six replicates of 40 birds each. Birds were fed the experimental diets based on corn and soybean meal for 17 weeks. Diets were iso-nutritive, except for energy level. Increasing AMEn levels had a negative effect on egg production and egg mass (p≤0.05). AMEn levels did not influence body weight, egg weight, or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy conversion; Egg quality; Laying hens.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2014000400007

Reduction of the nutritional values of diets for hens through supplementation with phytase
Provedor de dados: 96
Autores: Lima,Matheus Ramalho de; Costa,Fernando Guilherme Perazzo; Givisiez,Patrícia Emília Naves; Silva,José Humberto Vilar da; Sakomura,Nilva Kazue; Lima,Denise Fontana Figueiredo.
The aim of this work was to evaluate the effects of the reduction on nutritional levels of diets for semi-heavy hens during the laying peak on performance, egg quality and bone parameters. A total of eight diets were evaluated, each one with five repetitions of eight birds: 1) control: formulated to supply requirements by the birds; 2) control + 0.03% or 600 FTU; 3) 15% crude protein; 2,800 kcal ME; 3.8% Ca and 0.28% aP; 4) diet 3 + 0.03% or 600 FTU; 5) 14% crude protein; 2,750 kcal ME; 3.4% Ca and 0.23% aP; 6) diet 5 + 0.03% or 600 FTU; 7) 13% crude protein; 2,700 kcal ME; 3.0% Ca and 0.18% aP; and 8) diet 7 + 600 FTU. The reduction of the nutritional levels harmed the performance of the birds, particularly egg production and egg mass, which improved by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone health; Eggs; Laying hens; Performance.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001000016

Effect of using organic microminerals on performance and external quality of eggs of commercial laying hens at the end of laying
Provedor de dados: 96
Autores: Maciel,Mônica Patrícia; Saraiva,Edilson Paes; Aguiar,Édina de Fátima; Ribeiro,Pedro Assunção Pimenta; Passos,Débora Pereira; Silva,Jussara Barros.
The objective of the present study was to evaluate the effect of using microminerals in organic form on the performance and quality of eggs from commercial laying hens at the end of laying. Four hundred and eighty Hisex strain hens, 72 to 80 weeks of age, were used. A randomized complete design was used, with six replications and 16 birds for each experimental unit. Five diets were evaluated: basal feed supplemented with all microminerals in inorganic form (control); basal feed supplemented with 50% microminerals zinc (Zn) + manganese (Mn) + copper (Cu) in organic form and 50% in inorganic form; basal feed supplemented with 50% zinc in organic form and 50% in inorganic form; basal feed supplemented with 50% manganese in organic form and 50% in inorganic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg characteristics; Laying hens; Minerals; Production.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000200017

Effects of arginine and phytogenic additive supplementation on performance and health of brown-egg layers
Provedor de dados: 96
Autores: Fascina,Vitor Barbosa; Pasquali,Guilherme Aguiar Mateus; Berto,Daniella Aparecida; Silva,Amanda da Lapa; Garcia,Edivaldo Antônio; Pezzato,Antonio Celso; Gonzales,Elisabeth; Sartori,José Roberto.
ABSTRACT This study was performed to evaluate the effects of the association of different digestible arginine and phytogenic additive dietary levels on performance and health status of brown-egg layers. In this study, a total of 504 33-week-old Hisex Brown layers were distributed into a completely randomized experimental design to a 4 × 3 factorial arrangement (dietary digestible arginine levels: 880, 968, 1056, or 1144 mg/kg of feed × phytogenic additive levels: 0, 100, and 200 mg/kg of feed) with six replicate cages of seven birds per cage. The phytogenic additive was composed of extracts of Baccharis dracunculifolia (40%), Astragalus membranaceus lipopolysaccharides (20%), cinnamon, and grape seed (20%). Feed intake was reduced when diets containing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aminoacids; Arg; Laying hens; Plant extract.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000600502

Use of water-treated black tea waste instead of wheat bran in laying hen diets
Provedor de dados: 96
Autores: Kaya,Hatice; Çelebi,Şaban; Kaya,Adem; Gül,Mehmet.
ABSTRACT We assessed the effects of different amounts of water-treated black tea waste (BTW) in the diets of laying hens on performance, egg quality, yolk peroxidation, and blood parameters in this study. The experiment lasted for 12 weeks, during which a total of 108 Lohman layers, of 24 weeks old, were randomly allocated to one of six dietary treatments (18 hens each); each treatment consisted of six replicate cages, each containing three hens. Experimental animals were fed a commercial diet that contained 0 (control), 20, 40, 60, 80, and 100% BTW in place of wheat bran. Providing BTW in diets for laying hens, instead of wheat bran, did not have a significant effect on egg production, egg weight, or body weight change. As the amount of BTW in the diet...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Egg quality; Laying hens; Performance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100545

Presence of roosters in an alternative egg production system aiming at animal welfare
Provedor de dados: 96
Autores: Pereira,Dayana Cristina de Oliveira; Miranda,Késia Oliveira da Silva; Demattê Filho,Luiz Carlos; Pereira,Gustavo do Valle; Piedade,Sonia Maria De Stefano; Berno,Patricia Rodrigues.
ABSTRACT The objective of this study was to evaluate the effect of the presence of roosters on welfare and egg production of laying hens reared in an alternative system. Two breeding systems were established: barn 1 - laying hens reared without roosters (4500 birds); and barn 2 - laying hens reared with roosters (4500 layers and 250 roosters). In the poultry facilities, microclimate, egg production, mortality rate, and bird behavior were evaluated. Microclimate analysis showed that the birds were subjected to periods of constant heat stress, except for the morning hours. However, even under these conditions, egg production results and mortality rate were consistent with the indices recommended in the Isa Brown management guide in the barn with roosters;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Behavior; Enthalpy; Husbandry environment; Laying hens.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000300175

Epidemiological characterization and risk evaluation associated with the presence of Phthiraptera in poultry farms from Minas Gerais, Brazil
Provedor de dados: 3
Autores: Oliveira, Tiago Mendonça de; Teixeira, Cristina Mara; Pinto, Mariana Olímpia Köhler Marra; Arcebispo, Thiago Luiz Mendes; Soriano-Araújo, Amanda; Cunha, Lucas Maciel; Diniz, Soraia Araújo; Silva, Marcos Xavier.
Phthiraptera are lice highly adapted to living as permanent and obligatory ectoparasites of birds and mammals. High infestations by biting lice contribute to the low productivity, loss quality of the eggs, besides weight decrease of chickens. Therefore, this study aimed to evaluate and to characterize the risks involved with the presence of biting lice in laying chicken from Minas Gerais, Brazil, throught a Multiple Correspondence Analysis (MCA). A secondary database with information regarding 402 chicken houses from 42 properties of laying hens from the same region was used and adapted for this study. The variables that composed the correspondence model were selected through Chi-square tests (p ≤ 0.05). A risk index was designed to relate the presence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epidemiology; Lice; Laying hens; Risk index; Correspondence analysis.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/47474

Concentrations and Settling Rates of Particulate Matter in Laying Hen Barns in the Hot Climatic Region of Cameroon
Provedor de dados: 111
Autores: Ngwabie, Ngwa Martin.
Particulate matter (PM) serves as a carrier of adhesive gaseous compounds, and may result to an underestimation of gas emissions from livestock barns when only filtered air samples are analysed. PM concentrations have hardly been studied in the unique livestock production system of Sub-Saharan Africa. This study was aimed at generating baseline data for PM (total suspended particulates) concentrations and settling rates in laying hen barns with cemented floors and wood shavings added as an initial bedding material. Measurements were conducted in two naturally ventilated laying hen barns in Cameroon; a barn with 4 months old hens that had just stated laying eggs and a barn with 18 months old egg laying hens. PM concentration was determined gravimetrically...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air pollution; Climate change; Dust; Laying hens; Particulate matter; Total suspended particulates; Cameroon.
Ano: 2020
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5566

Performance and egg quality of laying hens fed with dietary levels of digestible lysine and threonine
Provedor de dados: 45
Autores: Figueiredo,G.O; Bertechini,A.G; Fassani,E.J; Rodrigues,P.B.; Brito,J.Á.G; Castro,S.F.
The present study was developed using 864 Hy-Line W36 laying hens (42 to 58 weeks of age) with a randomized experimental design in a 4x3 factorial arrangement, with five replicates and 12 birds per experimental unit and 4 evaluation periods of 28 days each. The digestible lysine levels studied were 0.675%, 0.743%, 0.811% and 0.879%, and the digestible threonine levels were 0.542%, 0.596% and 0.650%. The performance and egg quality was evaluated. There were no significant effects on the egg production, specific gravity, albumen and yolk percentage and total solids in albumen and yolk for birds submitted to the different dietary digestible lysine and threonine levels. There was significant interaction between these amino acids on the egg shell percentage and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amino acids; Laying hens; Crude protein; Haugh unit.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352012000300028

Experimental Salmonella Gallinarum infection in light laying hen lines
Provedor de dados: 58
Autores: Berchieri Júnior,Angelo; Oliveira,Gláucia Helaine de; Pinheiro,Lucas Augusto Soeiro; Barrow,Paul A.
Although the epidemiology of fowl typhoid in chickens supposedly involves a vertical transmission stage, a previous work run by the authors has suggested that this did not happen in a commercial line of laying hens highly susceptible to systemic disease with Salmonella Gallinarum. A new experiment was carried out in two other lines of commercial layers, considerably more resistant than those used in the previous study. Clinical fowl typhoid was not observed, but Salmonella Gallinarum was isolated from the spleen and liver four weeks after infection and, sporadically, from the ovary.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Salmonella Gallinarum; White Leghorn; Infection; Laying hens.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822000000100012

Experimental infection of laying hens with Salmonella enterica serovar Gallinarum
Provedor de dados: 58
Autores: Oliveira,Gláucia Helaine de; Berchieri Junior,Angelo; Fernandes,Alexandre César.
Experimental infections were set up in commercial laying birds, comprising a white relatively resistant line and a red susceptible line infecting with Salmonella enterica serovar Gallinarum. The major findings were that in susceptible birds clinical disease occurred in a dose-dependent manner. Faecal excretion occurred in susceptible birds almost up to death but also occurred in the more resistant line and in birds, which were convalescing. Removal of birds, which had died from the disease, from the environment, reduced the resultant mortality/morbidity and may be regarded as a useful measure for control.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laying hens; Salmonella Gallinarum; Contact infection.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000100011

Egg shell treatment methods effect on commercial eggs quality
Provedor de dados: 65
Autores: Almeida,Dayane Santos de; Schneider,Aline Félix; Yuri,Flavio Manabu; Machado,Bárbara Dalazen; Gewehr,Clóvis Eliseu.
ABSTRACT: The objective was to evaluate commercial eggs quality after being subjected to a cleaning process and immersion in whey protein concentrate (WPC) as a function of storage time. The experimental design was completely randomized in a factorial 4x7, being four methods of treating shell (not cleaned and not coated with WPC, not cleaned and coated with WPC, cleaned and not coated with WPC, cleaned and coated with WPC and seven periods of storage (1, 7, 14, 21, 28, 35 and 42 days) for a total of 28 treatments, with five replicates of four eggs each. Quality parameters evaluated were weight loss of eggs (%), specific gravity (g/cm3), haugh units (HU), yolk index (YI) and potential hydrogen (pH) albumen. The storage period increase, regardless of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food; Laying hens; Storage; Whey protein concentrate.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000200336

Critical points on egg production: causes, importance and incidence of eggshell breakage and defects
Provedor de dados: 64
Autores: Mazzuco,Helenice; Bertechini,Antonio Gilberto.
The occurrence of broken eggs directly depends on the quality of the shell. It is important to consider that the problem of broken eggs is not due to a single factor but a combination of factors. Shell defects, irregularities in shell shape, texture and surface are commonly observed during a regular egg laying cycle and the causes are varied. The incidence of downgraded eggs still represents an important source of economic loss for the egg industry due to products damage and need for further processing. It is possible to obtain significant reduction in the number of eggs lost due to the inferior quality of the shell attempting to an adequate nutrition, disease control, good management practices, and use of genetic lines with higher quality eggshell traits.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Defective shell; Egg industry; Eggshell quality; Laying hens; Shell integrity.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000100001

Effects of the use of soybean oil and animal fat in the diet of laying hens on production performance and egg quality
Provedor de dados: 64
Autores: Oliveira,Daniela Duarte de; Baião,Nelson Carneiro; Cançado,Silvana de Vasconcelos; Oliveira,Benedito Lemos de; Lana,Ângela Maria Quintão; Figueiredo,Tadeu Chaves de.
The effects of different dietary lipids on the fatty acid profiles of eggs produced by 20 and 54 wk old Dekalb laying hens were investigated. Laying hens were subjected to three defined treatments according to the source of lipid added to their diets: soybean oil, beef tallow, and a control diet (without the addition of oil). The experimental design was in a 3x2 factorial arrangement (three treatments and two different ages). The fatty acid composition of the yolks in the eggs produced by the laying hens was analyzed. The eggs produced by laying hens on the soybean oil diet had a large amount of polyunsaturated fatty acids (PUFA) omega-6 (n-6) and omega-3 (n-3) in their yolks (23.55, 2.30% respectively), whereas egg yolks from hens who were given beef...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg yolks; Laying hens; Beef tallow; Soybean oil; Fatty acids.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542011000500018