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| Registros recuperados: 32 | |
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| MacDonald, James M.. |
| Broiler production in the United States is coordinated almost entirely through systems of production contracts, in which a grower’s compensation is based, in part, on how the grower’s performance compares with that of other growers. The industry is undergoing a gradual structural change as production shifts to larger broiler enterprises that provide larger shares of an operator’s household income. Larger enterprises require substantially larger investments in broiler housing, and new or retrofitted houses are also an important source of productivity growth in the industry. This report, based on a large and representative survey of broiler operations, describes the industry’s organization, housing features, contract design, fees and enterprise cost... |
| Tipo: Report |
Palavras-chave: Broilers; Chickens; Production contracts; Broiler grower financial performance; Chicken housing; Chicken litter; Poultry; Farm Management; Production Economics. |
| Ano: 2008 |
URL: http://purl.umn.edu/58627 |
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| Silva,IGO; Vellano,IHB; Moraes,AC; Lee,IM; Alvarenga,B; Milbradt,EL; Hataka,A; Okamoto,AS; Andreatti Filho,RL. |
| ABSTRACT The present study evaluated a probiotic and a competitive exclusion product injected in ovo on day 18 of incubation together with Marek's disease vaccine in eggs of 56-week-old broiler breeders. Three experiments were carried out. The first trial evaluated the effect of treatments on hatchability, cecal colonization of Salmonella Heidelberg (SH), and intestinal mucosa immunity (immunoglobulin A levels in the intestinal fluid). The second trial evaluated the viability of the microorganisms in the products inoculated in a solution containing diluent and Marek's disease vaccine. The third trial evaluated the colonization of the cecal microbiota in non-challenged chickens during first four days of life by culturing cecal samples under aerobic and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chickens; Competitive exclusion; In-ovo inoculation; Probiotic; Salmonella Heidelberg. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2017000100019 |
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| Xie,LJ; Xie,XZ; Zhou,YW; Liang,C; Jiang,YY; Chen,Z. |
| ABSTRACT We investigated the effect of heat stress (HS) on the expression of the GABA receptor in the hypothalamic-pituitary-gonadal (HPG) axis of Wenchang chickens. Real-time quantitative RT-PCR (qRT-PCR) was used to quantify the GABA receptor mRNA levels along the HPG axis of chickens under HS (40±0.5 °C) for 1-6 weeks. Our results showed that the expression of GABAA and GABAB receptor at the mRNAs levels in the tissues of HPG axis exhibited fluctuation and variability. After HS, the mRNA level of GABAA receptor was significantly reduced in the hypothalamus of 1-week-old and in the pituitary of 3-week-old chickens, but significantly increased in the pituitary of 1-, 4-, and 5-week-old chickens. The GABAB receptor mRNA level significantly declined in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heat Stress; GABA receptor mRNA; HPG axis; Chickens. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000200277 |
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| Camilotti,E; Moraes,LB; Furian,TQ; Borges,KA; Moraes,HLS; Salle,CTP. |
| ABSTRACT The Infectious Bursal Disease (IBD) is a contagious viral disease that affects young chickens and may cause high morbidity and mortality. As the virus is very resistant to the environment, vaccination is required in case of high infection pressure. Due to variations in the virulence degree of the vaccines available to control IBD, this study aimed at evaluating the pathogenicity and immunogenicity of three types of vaccines. In total, 220 one-day-old specific pathogen free (SPF) chickens were immunized with recombinant, immune-complex and intermediate vaccines, or not vaccinated (55 birds per group) and challenged with IBD G11 strain on day 25. On days 25, 30, and 35, the Bursa of Fabricius (BF) were submitted to gross and histological... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Infectious Bursal Disease; Chickens; Vaccine; Immunity. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000200303 |
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| Mesa,D; Muniz,E; Souza,A; Geffroy,B. |
| ABSTRACT In the last decades animal production has considerably increased worldwide to sustain an ever-growing human population. Among animal reared for consumption purposes, chickens are undoubtedly one of the most successful, mainly due to their rapid growth rate. The development of broiler farming has been accompanied in recent years by a substantial attention to animal welfare. This study is aimed at assessing the effects of different housing conditions on both feed conversion ratio and mortality of male broiler flocks through a large-scale study (more than 100 million birds) involving 977 farms belonging to one major producer. For this, we evaluated nine features of the housing system using a linear model with random effect. The features were:... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chickens; Sheds; Feed conversion ratio; Mortality; Welfare.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2017000200263 |
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| Jones,RC. |
| The emergence and nature of different strains of infectious bronchitis virus (IBV) in Europe are described. Infectious bronchitis (IB) is the most important endemic viral respiratory disease where highly pathogenic Newcastle disease and avian influenza are not present. IB was first described in the UK in 1948 and identified as Massachusetts type. In the 1970s and 80s new serotypes were reported in Holland and elsewhere and new vaccines were developed. The 1990s saw the emergence of the major variant commonly called 793B, again needing a new vaccine. Two novel types have been recognised since 2000, Italy 02 and QX. Italy 02 appears to be well controlled by the use of two different live vaccines (H120 and the 793B-related 4/91) while for QX, associated with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Control; Chickens; Europe; Infectious bronchitis; Vaccine. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2010000200009 |
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| Morgado,HS; Cysneiros,CSS; Sousa,CM; Stringhini,JH; Ulhoa,CJ; Silva,AS; Fabino Neto,R; Freitas,PVDX; Oliveira,HP; Batista,LHC. |
| ABSTRACT Two experiments were performed to evaluate the hematological and blood biochemistry parameters, biometry of digestive organs, enzyme activities, protein content and absolute weight of the pancreas of broilers fed pre-starter and pre-starter diets supplemented or not with amylase from Aspergillus awamori. In total, 120 male Cobb chicks were housed in heated cages in each experiment. A completely randomized experimental design, with two treatments (feed with and without amylase) and six replicates per treatment of 10 birds each was applied. The data were subjected to analysis of variance using the F-test at 5% probability level. The dietary amylase addition did not affect hematological and blood biochemistry parameters and the biometry of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Blood; Chickens; Fungi; Nutrition. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000400725 |
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| Fonseca,BB; Soncini,RA; Vieira,FL; Siqueira,MS; Guimarães,AR; Beletti,ME; Rossi,DA. |
| Campylobacter sp is an important agent that causes foodborne infection, particularly in food of poultry origin. Therefore, the efficient control of the transmission routes in chicken farms is of outmost importance to prevent it from spreading. In chicken farms, the main transmission route of this microorganism is horizontal, as the vertical route continues to be the object of inconclusive researches. The objective of this study was to verify the presence of Campylobacter sp in breeder hens, meconium, and other organs of day-old chicks derived from these breeders in order to obtain information on vertical transmission. Microbiological analyses were performed, using cloacal swabs from 279 breeder hens. Positive breeders were segregated, and the presence of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Campylobacter sp; Chickens; Vertical transmission; Epidemiology. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000400010 |
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| Pinto,Luís Fernando Batista; Packer,Irineu Umberto; Ledur,Mônica Corrêa; Moura,Ana Silvia Alves Meira Tavares; Nones,Kátia; Coutinho,Luiz Lehmann. |
| This study aimed at mapping QTL (quantitative trait loci) using linear combinations of characteristics of economical interest in Gallus gallus. A total of 350 F2 chickens from an initial crossing among males from a broiler line (TT) with females from a layer line (CC) were used. It was conducted a QTL mapping in chromosomes of Gallus gallus (GGA1, GGA3, GGA5, GGA8, GGA11, and GGA13) for 20 performance and carcass traits. For detecting QTL, it was used the likelihood ratio test between a reduced model (including fixed effects of sex, hatch and random effect of infinitesimal genetic value) and a full model (including all the previous effects plus QTL effects). When original characterists were analyzed, that is, before the formation of linear combinations,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broilers; Canonical variables; Chickens; Genome. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001100016 |
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| Registros recuperados: 32 | |
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