确定雄性和雌性科布 MV × 500 肉鸡低粗蛋白日粮中的第 4 种限制氨基酸。

Determining the 4th limiting amino acid in low crude protein diets for male and female Cobb MV × 500 broilers.

Centre of Excellence for Poultry Science, University of Arkansas , Fayetteville, AR, USA.

Poultry Research Foundation, School of Life and Environmental Sciences, Faculty of Science, The University of Sydney , Camden, NSW, Australia.

Br Poult Sci. 2020 Dec;61(6):695-702. doi: 10.1080/00071668.2020.1782348. Epub 2020 Jul 17.

Abstract

Four experiments were conducted to determine the 4th limiting amino acid (AA) in maize-soybean meal-based diets. 2. Deletion assay methodology was used to quantify performance and carcase trait responses to potential deficiencies in essential and conditionally essential AA caused by reductions in dietary crude protein of maize-soybean meal-based diets from 202.9 to 186.5 g/kg. 3. The deletion of Val, Phe and Gly + Pro resulted in negative effects on live performance and carcase traits for male broilers, whereas AA deletion only affected wing weights for females with no response on live performance. 4. Further experimentation could not duplicate a response to Phe or Pro in male broilers. 5. Valine was identified as the potential 4th limiting AA in maize-soybean meal-based diets and was not found to be co-limiting with Ile.

摘要

进行了四项实验，以确定基于玉米-豆粕的日粮中的第四种限制氨基酸（AA）。
采用删除试验方法，定量评估由于降低基于玉米-豆粕的日粮粗蛋白水平（从 202.9 降至 186.5 g/kg）对雄性肉鸡生产性能和胴体性状的影响，以及对必需和条件必需氨基酸潜在缺乏的反应。
缬氨酸、苯丙氨酸和缬氨酸+脯氨酸的删除对雄性肉鸡的生产性能和胴体性状产生负面影响，而 AA 删除仅影响雌性鸡的翅膀重量，对生产性能没有影响。
进一步的试验无法复制对雄性肉鸡中苯丙氨酸或脯氨酸的反应。
缬氨酸被确定为基于玉米-豆粕的日粮中的潜在第四种限制 AA，并且与异亮氨酸没有共同限制作用。