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Registros recuperados: 13
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Bone mineral density of tibae and femura of broiler breeders: growth, development and production Rev. Bras. Ciênc. Avic.
Almeida Paz,ICL; Mendes,AA; Quinterio,RR; Vulcano,LC; Takahashi,SE; Garcia,RG; Komiyama,CM; Balog,A; Pelícia,K; Wescheler,FS; Scudeller,PSO; Piccinin,A.
The aim of this study was to follow-up the physiological variations in the development of the bone tissue, associating them with the egg production curve. This study was carried out in the facilities of the Faculdade de Medicina Veterinária e Zootecnia of the UNESP, Botucatu, Brazil. Twenty-three families of Ross broiler breeders were used, each family consisting of 13 females and 1 male, distributed in 23 pens of 5.0m² each. The management was that recommended by the genetic company manual (Agroceres Ross, 2003), with daily feeding until 6th week of age; and birds were fed according to a 5:2 schedule (5 days fed, 2 days of fasting) between 7 and 17 weeks of age, returning to daily feeding starting at 18 weeks of age. Birds did not receive afternoon...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bone; Bone density; Broiler breeders; Egg production; Shell quality.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000200002
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Development and Performance of a Mechanical Egg Collection System Versus the Hand-Operated Dutch Nest Rev. Bras. Ciênc. Avic.
Pilotto,F; Ribeiro,AML; Cargnelutti Filho,A; Klein,VA.
ABSTRACT The aim of this study was to design a new mechanical nesting system based on scientific works on the behavior of laying hens, and to compare its performance with that of a hand-operated Dutch nest. The equipment was assessed in two poultry houses; in the first one, the eggs were collected manually, whereas in the second one, the newly designed mechanical nest was used for the collection. A total of 7,800 hens and 800 males were housed in each poultry house, and the percentages of eggs produced, nest dirty eggs, floor eggs, and cracked and discarded eggs were determined between weeks 25 and 52. The percentage of eggs with microcracks, infertility, embryo mortality, bacterial contamination, fungal contamination, chicks with stunting syndrome and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Broiler breeders; Laying behavior; Mechanical nest.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000400523
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Efeitos do horário de postura de matrizes pesadas sobre o rendimento de incubação Arq. Bras. Med. Vet. Zootec.
Barbosa,V.M.; Rocha,J.S.R.; Pompeu,M.A.; Fernandes,M.N.S.; Machado,A.C.; Cunha,C.E.; Cardeal,P.C.; Ruiz,L.E.A.; Lara,L.J.C.; Baião,N.C..
The effects of oviposition time, which represents different positions of the follicles in a sequence of posture, were studied on egg weight, chick weight, egg weight loss during incubation, hatchability, embryo mortality and infertility . A total of 19, 820 eggs, layed on the same day, from Cobb® broiler breeders aging 46-week-old were used. The eggs were classified according to the oviposition time posture (corresponding to the time of collection) from 8:30 am, 10:30 am, 12:30 pm, 14:30 pm and 16:30 pm, which represented the folowing treatments: 1st, 2nd, 3rd, 4th and 5th collects, respectively. The experimental design was completely randomized with five treatments and 36 repetitions, and each tray of 96 eggs was considered a repetition. The normal and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Broiler breeders; Embryo development; Incubation; Time of laying.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352013000400045
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Effect of storage period and egg weight on embryo development and incubation results Rev. Bras. Ciênc. Avic.
Schmidt,GS; Figueiredo,EAP; Saatkamp,MG; Bomm,ER.
A total number of 300 females and 30 males of two experimental broiler lines, TT (male) and PP (female), with 39 and 36 weeks of age, respectively. Experiment 1 (TT) evaluated the effect of storage time (ST) on hatchability and embryo mortality (EM). Eggs were stored for 2 (ST1), 4 (ST2), 6 (ST3), 8 (ST4), 10 (ST5), 12 (ST6), and 24 (ST7) days and EM was assessed in the periods of 0 to 6 (EM1), 7 a 13 (EM2), 14 to 17 (EM3), 18 to 21 (EM4), and 0 to 21 (TEM) days. Experiment 2 (PP) evaluated the effect of egg weight (EW) on embryo development. Eggs were individually collected and weighed. Embryos were collected and weighed on days 9 (EW9), 11 (EW11), 13 (EW13), EW15, 17 (EW17) days of incubation and at hatching (EW21). ST linearly influenced hatchability...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chick weight; Broiler breeders; Embryo development; Embryo mortality; Egg weight; Incubation.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2009000100001
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Inclusion of canthaxanthin and 25-hydroxycholecalciferol in the diet of broiler breeders on performance and incubation parameters Ciência Rural
Duarte,Vinicius; Minafra,Cibele Silva; Santos,Fabiana Ramos dos; Perim,Francisco dos Santos.
The objective of this experiment was to evaluate the effects of a diet containing canthaxanthin and 25-hydroxycholecalciferol (25-OH-D3) on the production and reproductive performances of Cobb 500 broiler breeders aged 53 to 61 weeks. The study included 36,000 Cobb 500 female and 3,600 male broiler breeders aging 51 weeks. The birds were housed in three poultry houses divided into four plots, totaling 12 experimental units each containing 3,000 females and 300 males. The birds received the following treatments: control diet (without the studied additives) or the control diet with the addition of 60mg kg-1feed of 25-(OH)-D3 and canthaxanthin feed (6mg of canthaxanthin and 2,760,000IU of 25-(OH)-D3 per kg of feed) per the supplier's recommendations. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carotenoids; Vitamin D; Broiler breeders; Hatching; Egg production.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015001102050
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Infectious laryngotracheitis: a review Rev. Bras. Ciênc. Avic.
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
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Influence of egg pre-storage heating period and storage length on incubation results Rev. Bras. Ciênc. Avic.
Silva,FHA; Faria,DE; Torres,KAA; Faria Filho,DE; Coelho,AAD; Savino,VJM.
This experiment aimed at evaluating the influence of different heating times of settable eggs of Cobb 500® broiler breeders before submitting them to different storage periods on egg weight loss, embryo mortality, and hatchability. A total number of 1,980 eggs were distributed in a completely randomized experimental design with a 3 x 3 factorial arrangement, comprising nine treatments with 22 replicates of 10 eggs each. The following factors were analyzed: pre-storage heating periods (0, 6, 12 hours at 36.92°C) and storage periods (4, 9, 14 days at 12.06°C). After storage, eggs were incubated under usual conditions, and were transferred to the hatcher at 442 hours of incubation. Eggs were weighed before heating, incubation, and transference to determine...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Broiler breeders; Egg weight loss; Embryo development; Embryo mortality; Hatch.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2008000100003
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Influence of feeding time on sexual maturity and carcass composition in female broiler breeders Rev. Bras. Ciênc. Avic.
Avila,VS de; Penz Jr.,AM; Rosa,PS; Brum,PAR de; Guidoni,AL; Ledur,MC.
One thousand two hundred and ninety six Arbor Acres females and 144 males were used to study the influence of feeding time on sexual maturity and carcass composition. Treatments were: T1 = feeding at 6:30 am, T2 = 50% feeding at 6:30 am and 50% at 3:30 pm (dual), T3 = feeding at 11:00 am, T4 = feeding at 3:30 pm. Nutrition and management were as recommended to the commercial line. Variables studied were: sexual maturity at 5% production (SM), mean egg production percentage (PEP) body weight (BW), carcass composition, tibia weight (TIBW) and tibia calcium (Ca) and phosphorus (P) contents. Analysis of variance was used, and the means were compared using Student's t test. T2 females reached SM at 25.92 weeks, which was earlier (p<0.01) than the other...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Broiler breeders; Carcass composition; Egg production; Feeding time; Sexual maturity.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000300006
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Is the Eggshell Quality Influenced by the Egg Weight or the Breeder Age? Rev. Bras. Ciênc. Avic.
Crosara,FSG; Pereira,VJ; Lellis,CG; Barra,KC; Santos,SKA; Souza,LCGM; Morais,TA; Litz,FH; Limão,VA; Braga,PFS; Fernandes,EA.
ABSTRACT For a long time, it has been said that eggshell quality decreases as eggs increase in size, but this increase is seen as the breeder age advances. Therefore, the present study aimed to evaluate the age and egg weight effect on Cobb 500 broiler breeders on eggshell quality. The quality measures tested were eggshell and mineral matter percentage, eggshell surface, shape and eggshell index, eggshell and membrane thickness and specific gravity. Eggs from 27, 31, 36, 40, 46, 48, 53, 58 and 63 week-old breeders were classified as eggs with a constant weight ranging from 63.8 ± 0.2; and eggs with increasing weight, according to age, being: 55.8g; 60g; 62.2g; 64.2g; 65.2g, 66.6g, 68.1g, 69.9g and 72.5g, respectively. The eggs weight did not influence the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Broiler breeders; Eggshell thickness; Shell area; Shell index.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000200314
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Modeling energy utilization in broiler breeders, laying hens and broilers Rev. Bras. Ciênc. Avic.
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
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Performance of female broiler breeders submitted to different feeding schedules Rev. Bras. Ciênc. Avic.
Avila,VS de; Penz Jr.,AM; Brum,PAR de; Rosa,PS; Guidoni,AL; Figueiredo,ÉAP de.
The performance of Arbor Acres broiler breeders (1,296 females; 144 roosters) was evaluated when submitted to the following treatments (T): T1 = feeding at 6:30 a.m. (control); T2 = 50% feeding at 6:30 a.m. and 50% at 3:30 p.m. (dual feeding); T3 = feeding at 11:00 a.m.; and T4 = feeding at 3:30 p.m. Treatments were randomly distributed in 48 pens. There were 27 females and 3 males in each pen and 12 repetitions per treatment. Nutrition and management were as recommended for the commercial strain. It was evaluated age at first egg (AFE), total egg production (TEP), number of days with production above 80% (DAP80), laying peak (P), female mortality (MOR), and gross profit margin (GM) per hen. Data were submitted to analysis of variance and means were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Broiler breeders; Economic evaluation; Feeding time; Performance.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000300007
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Test profiles of broiler breeder flocks housed in farms with endemic Mycoplasma synoviae infection Rev. Bras. Ciênc. Avic.
Fiorentin,L; Mores,MAZ; Trevisol,IM; Antunes,SC; Costa,JLA; Soncini,RA; Vieira,ND.
There is a need for a better understanding of the epidemiology of Mycoplasma synoviae (MS) infection in broiler breeders in Brazil. Many features of the infection remain unrecognizable, because there are no clinical signs of the disease. A detailed testing was performed at each 6 to 8 weeks in three MS-free flocks introduced in farms with endemic MS infection for a follow-up epidemiological study. Every flock was monitored by polymerase chain reaction (PCR), by serum plate agglutination (SPA) and hemagglutination inhibition (HI) for serology studies, and isolation of mycoplasmas from tracheal swabs. PCR was found to be the most sensitive test, detecting early MS infection. Serology was positive in less than 50% of the sera and MS was isolated only between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Broiler breeders; Mycoplasma synoviae; PCR; Serology; Survey; Transmission.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000100005
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Use of radiograph optical densitometry to monitor bone quality in broiler breeders Rev. Bras. Ciênc. Avic.
Almeida Paz,ICL; Mendes,AA; Quinterio,RR; Vulcano,LC; Ballarin,AW; Takahashi,SE; Garcia,RG; Komiyama,CM; Balog,A; Pelícia,K; Wescheler,FS; Scudeller,PSO.
This study was carried out at Faculdade de Medicina Veterinária e Zootecnia, Universidade Estadual Paulista, Botucatu, SP, Brazil, and evaluated bone quality in broiler breeders. Twenty-three families of Ross broiler breeders were housed in 5.0-m² pens. The families were comprised of 13 females and one male at the onset of the experimental period. The mean number of females per family was 9.34 at the end of the trial. The feeding program and management followed strain guidelines (Agroceres Ross, 2003). Bone analyses were performed in the right tibia and femur using optical radiographic densitometry at 4, 8, 12, 15, 20, 24, 30, 35, 42, 47 and 52 weeks of rearing. Trap nests were used to collect eggs from the breeders two weeks before and after the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bone density; Broiler breeders; Eggshell quality; Optical densitometry; Seedor index.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000100005
Registros recuperados: 13
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