不同饲养阶段快大型黄羽肉鸡异亮氨酸需要量研究

doi:10.16431/j.cnki.1671-7236.2021.01.014

Abstract

Abstract: This experiment was conducted to determine isoleucine (Ile) requirement of Yellow-feathered broiler chickens at different feeding stages.2 400,2 160 and 1 920 Yellow-feathered broiler chickens of 0,22 and 43 days age were selected,according to gender and body weight,they were randomly divided into eight dietary treatments with six replicates (half male and half female),there were 50,45 and 40 chickens at 0-21,22-42 and 43-63 days of age,the levels of Ile in basal diet were 0.55%,0.50% and 0.45%,respectively.Ile was added gradiently in the basal diet in each treatment group,and the inter group interval level was 0.05%,the nutritional levels of all treatments were the same except for Ile.The experimental chickens were raised on the ground,and they were free to eat granular materials and drink freely.The results showed that the level of Ile and gender had significant effects on the growth performance of the three stages,and their interaction had significant effects on growth performance during the three stage (P<0.05).The average daily gain (ADG) and feed/gain (F/G) showed significant or extremely significant quadratic response with the increase of dietary Ile level (P<0.05;P<0.01).The prediction results of the two-slope broken-line model showed that,at 0-21 days of age,the optimal dietary Ile level that maximized ADG were 0.77%,0.72% and 0.73%,that optimized F/G were 0.75%,0.70% and 0.73% for male,female and mix chicks,respectively.At 22-42 days of age,the optimal dietary Ile level that maximized ADG were 0.68%,0.64% and 0.66%,that optimized F/G were 0.66%,0.62% and 0.64% for male,female and mix chicks,respectively.At 43-63 days of age,the optimal dietary Ile level that maximized ADG were 0.64%,0.59% and 0.61%,that optimized F/G were 0.61%,0.57% and 0.59% for male,female and mix chicks,respectively.In conclusion,the Ile requirement decreased with the increase of age,its requirement of male was significantly higher than that of female,and the nutrient requirement of Ile evaluated by F/G was lower than the recommended value based on ADG.

Key words: Yellow-feathered broiler chickens; growth performance; isoleucine; nutrient requirement; two-slope broken-line model

CLC Number:

S816

JIANG Shouqun, WANG Yibing, LIN Xiajing, FAN Qiuli, LI Long, CHENG Zhonggang, ZHENG Chuntian. Study on Isoleucine Requirement of Yellow-feathered Broiler Chickens in Different Feeding Stages[J]. China Animal Husbandry and Veterinary Medicine, 2021, 48(1): 124-134.

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Study on Isoleucine Requirement of Yellow-feathered Broiler Chickens in Different Feeding Stages

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