Ảnh hưởng của bột lông vũ thủy phân trong thức ăn đến khả năng sinh trưởng của gà Ross 308 nuôi thịt thương phẩm

Abstract

The objective of the experiment was to determine effects of hydrolyzed feather meal (HFM) on growth performance and carcass yield of broilers. A total of 1760 day-old male chicks (Ross 308) were assigned to one of 4 dietary treatments in a completely randomized design. Birds were fed the experimental diets containing 0 (control), 2, 4, and 6% HFM. Each treatment was replicated with 11 pens of 40 birds each. During the first 2 weeks of age, birds fed the diet containing 4% HFM had the same average daily gain (ADG) and feed conversion ratio (FCR) as those fed the control (P > 0.05). Over a 5-week period, the average body weight of birds fed the control was greater than that of birds fed diets with 2, 4 and 6% HFM (P < 0.001). The average daily feed intake of birds fed the control was similar (P > 0.05) to that of birds fed diets with 2 and 4% HFM, but greater (P < 0.05) than that of birds fed a 6% HFM diet. Birds fed diets with HFM had a lower ADG and greater FCR than those fed the control (P < 0.001). No differences were found among the treatments in dressing percentage, proportion of visceral organs, and survival rate (P > 0.05). Briefly, inclusion of 2-6% HFM in diets for broilers over 5 weeks reduced their growth performance.