Evaluating the Response of Cobb MV × Cobb 500 Broilers to Varying Amino Acid Density Regimens for a Small Bird Program

Journal of Applied Poultry Research

J. Caldas¹  L. Mejia¹  C. Coto¹  R.A. Hirai²  C.D. McDaniel²  K.G.S. Wamsley² 

[1] Cobb-Vantress, Siloam Springs, AR 72761, USA;Department of Poultry Science, Mississippi State University, 46 Old Bully Blvd, Mississippi State, MS 39762, USA;

关键词: amino acid density;    lysine;    live performance;    processing yield;   

DOI  :  

来源: DOAJ

【 摘 要 】

SUMMARY: Primary breeder companies are continuously striving to improve existing commercial broiler crosses to increase performance and reduce cost. The objective of this study was to evaluate the response of a new commercial broiler cross (Cobb MV × Cobb 500) under 4 different amino acid density (AAD) regimens on live performance and carcass yield during a 36 d grow-out period with 2 processings to collect data at 32 and 35 d. Two basal diets were formulated to low AAD (LAAD, digestible lysine, dLys 1.08, 0.95, and 0.87% for starter, grower, and finisher) and very high AAD (VHAAD, dLys 1.39, 1.26, and 1.12%). Medium and high AAD (MAAD and HAAD) diets were created by mixing the LAAD and VHAAD diets at ratios of 66.6:33.3 and 33.3:66.6, respectively. This was a randomized complete block design with 12 replications/treatment (16 birds/pen, 0.07 m2/bird). Feed intake/bird was reduced (P < 0.05) when birds were fed the VHAAD diet at 0–32 and 0–35 d. As AAD increased, FCR decreased significantly in a stepwise manner by approximately 4 points at each AAD level (P < 0.05). Feeding higher levels of AAD improved broiler live performance and carcass yields. At 33 d, birds fed the HAAD diet had the highest potential gross profit/bird, and at 36 d, birds fed the VHAAD diet had the highest potential gross profit/bird. Further research should evaluate the effects of feeding increased AAD diets to male and female Cobb MV × Cobb 500 separately, as well as in different feeding phases and longer grow-out periods.

【 授权许可】

Unknown