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Qaid,M; Albatshan,H; Shafey,T; Hussein,E; Abudabos,AM. |
ABSTRACT The current experiment was conducted to evaluate the effect of stocking density (SD) on the performance and immunity of 1- to 14-d-old broilers. A total of 1836 one-day-old Cobb 500 broilers were housed at four different SD (30, 60, 90 and 120 chicks/m2). Body weight gain (BWG), feed intake (FI) and feed conversion ratio (FCR) were estimated on d 2, 5, 8, 11 and 14. Relative lymphoid organ weights, maternal antibody titers against IBV, IBD and NDV, and stress indicators were estimated on d 3, 6, 9 and 12.The results indicated that age significantly (p<0.001) affected the performance and immunity of broiler chicks. Stocking density significantly (p<0.001) affected the performance and physiological stress indicators of broiler chicks, but not... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broilers; Immune response; Stocking density. |
Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000400683 |
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Abudabos,AM; Aljumaah,RS; Algawaan,AS; Al-Sornokh,H; Al-Atiyat,RM. |
ABSTRACT In total, 806 eggs of free-range Hassawi indigenous chickens were collected from local farm in Saudi Arabia. Eggs were weekly collected for 11 weeks. Initial egg weight (IEW) was recorded, and eggs were graded into four classes (A: 35-40 g, B: 40-45 g, C: 45-50 g, and D: 50-55 g). Eggs were stored for seven days at 75-80% relative humidity and 14-16 C, after which egg weight losses (WL0) were calculated. During incubation, eggs were weighed on days 7 (W7) and 14 (W14), and egg weight losses on days 7 (WL7) and 14 (WL14), and total loss (WL0-14) were calculated. Hatchling weight (CW) was measured. The proportion of CW relative to egg weight loss (WL) on days0, 7 and 14 days of incubation (CW:WL0; CW:WL7 and CW:WL14, respectively), and break out... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Egg weight; Embryo mortality; Hassawi chicken; Hatchability; Hen age. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2017000100033 |
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