Live Performance, Carcass Yield, and Welfare of Broilers of Different Genetic Strains Reared at Different Housing Densities
Autor: | J. N. T Arruda, RR Sikorski, M Schneider, Ecbp Guirro, Angélica Signor Mendes, D. Bonamigo, L Sausen, E. R Dias |
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Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
0301 basic medicine
Veterinary medicine live performance Blood count Biology Body weight Feed conversion ratio 03 medical and health sciences stress Animal science Yield (wine) lcsh:Zoology medicine lcsh:QL1-991 Physiological stress poultry industry lcsh:SF1-1100 lcsh:Veterinary medicine 0402 animal and dairy science 04 agricultural and veterinary sciences 040201 dairy & animal science Housing density 030104 developmental biology lcsh:SF600-1100 Animal Science and Zoology lcsh:Animal culture medicine.symptom Weight gain |
Zdroj: | Brazilian Journal of Poultry Science, Vol 18, Iss 1, Pp 141-152 (2016) Brazilian Journal of Poultry Science v.18 n.1 2016 Brazilian Journal of Poultry Science Fundação APINCO de Ciência e Tecnologia Avícolas (FACTA) instacron:FACTA Revista Brasileira de Ciência Avícola, Volume: 18, Issue: 1, Pages: 141-152, Published: MAR 2016 |
ISSN: | 1806-9061 |
Popis: | This study evaluated the performance, carcass yield and quality, and physiological stress indicators of broilers of three genetic strains reared at three housing densities for 29 days. A total of 828 day-old male chicks, with average initial weight of 40.0± 2.0g were used. Three genetic strains (Cobb 500, Ross 808, and Ross 508, with 276 birds each) and three housing densities (17, 19, and 21 broilers/m²) were tested. A completely randomized experimental design in a 3 x 3 factorial arrangement, with four replicates of 23 birds each, was applied. The following responses were evaluated: performance parameters (average weekly body weight, average daily gain, feed intake, feed conversion ratio), physiological stress indicators (blood glucose levels, blood cell counts), and carcass yield and quality (dermatosis, bruising, dermatitis, and femoral degeneration scores). Average weekly body weight (BW) and daily weight gain (DWG) were not influenced by rearing density (p≥0.05), but Cobb 500 broilers were the heaviest during the analyzed period. In the second week, Ross 508 birds showed better feed conversion ratio (FCR) when housed at the density of 17 broilers/m² (p≤0.001), whereas the best FCR of Ross 808 and Cobb 500 broilers was obtained at 21 broilers/m² (p≤0.001). Carcass yield was not influenced by the treatments (p≥0.05). Physiological stress indicators were not affected by the treatments, and remained within normal ranges (p≥0.05). Dermatosis scores (scratches) increased (p≤0.05) when housing density increased from 17 to 19 broilers /m². |
Databáze: | OpenAIRE |
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