高剂量植酸酶对饲粮可消化含硫氨基酸水平梯度变化条件下肉鸡生长性能及表观回肠氨基酸消化率的影响。

High doses of phytase on growth performance and apparent ileal amino acid digestibility of broilers fed diets with graded concentrations of digestible sulfur amino acids.

机构信息

AB Vista, Marlborough, Wiltshire SN8 4AN, UK.

Sri Ramadhootha Poultry Research Farm Pvt Ltd, Hyderabad 500030, India.

出版信息

Poult Sci. 2018 Oct 1;97(10):3610-3621. doi: 10.3382/ps/pey218.

DOI:10.3382/ps/pey218

PMID:29901749

Abstract

Two experiments of the same design were conducted to determine the influence of phytase on performance and apparent ileal digestibility (AID) of amino acids in broilers fed graded concentrations of digestible sulfur amino acids (dgM+C). Cobb 400 male broilers were allocated to 1 of 10 diets consisting of 5 basal diets formulated at 75, 82, 89, 96, or 103% of the Cobb 400 dgM+C requirements for each feeding phase. Phytase was included in each basal diet at 0 or 2,000 FTU/kg. In experiment 1, 33 birds/pen from hatch to day 42 were fed a 2-phase feeding program with 10 replicate pens/diet. In experiment 2, there were 26 birds/pen from hatch to day 21 and 8 replicate pens/diet. Data were analyzed as a 5 × 2 factorial and means separated using orthogonal contrasts. In experiment 1, overall (hatch to day 42) feed intake (FI) decreased (linear, P < 0.05), body weight gain (BWG) increased (quadratic, P < 0.05), and feed conversion ratio (FCR) was improved (quadratic, P < 0.05) as dgM+C increased to ≥96% in the diet. Phytase increased (P < 0.05) BWG and improved (P < 0.05) FCR, regardless of the percent dgM+C in the diet. In experiment 2, overall (hatch to day 21) BWG increased (quadratic, P < 0.05), and FCR was improved (quadratic, P < 0.05) as dgM+C increased to ≥96% in the diet. Phytase increased FI (P < 0.05) and BWG (P < 0.05) and improved FCR (P < 0.05), regardless of the percent dgM+C in the diet. In the absence of phytase, the AID of all amino acids was greatest (quadratic, P < 0.05) in birds fed between 89 and 96% dgM+C. However, in the presence of phytase the AID of all amino acids was greatest (quadratic, P < 0.05) in birds fed 82% dgM+C and greater at all levels of dgM+C than birds fed diets without phytase (dgM+C × phytase, P < 0.05). In conclusion, phytase improved AID of all amino acids and improved growth performance regardless of the level of dgM+C in the diet.

摘要

进行了两项相同设计的实验，以确定植酸酶对饲粮可消化硫氨基酸（dgM+C）浓度梯度下肉鸡的生产性能和氨基酸表观回肠消化率（AID）的影响。将科宝 400 雄性肉鸡分配到 10 种饲粮中的 1 种，这 10 种饲粮由 5 种基础饲粮组成，分别以满足科宝 400 肉鸡每个饲养阶段 dgM+C 需要量的 75%、82%、89%、96%或 103%配制。在每种基础饲粮中添加 0 或 2,000 FTU/kg 的植酸酶。在实验 1 中，从孵化到第 42 天，33 只鸡/笼采用 2 个阶段饲养程序，每个饲粮设 10 个重复笼。在实验 2 中，从孵化到第 21 天，每个重复 8 个笼，每笼 8 只鸡。数据采用 5×2 因子分析，用正交对比法进行均值分离。在实验 1 中，整体（从孵化到第 42 天）采食量（FI）降低（线性，P＜0.05），体重增加（BWG）增加（二次，P＜0.05），饲料转化率（FCR）改善（二次，P＜0.05），饲粮中 dgM+C 增加至≥96%。植酸酶增加了（P＜0.05）BWG，并改善（P＜0.05）FCR，而与饲粮中的 dgM+C 百分比无关。在实验 2 中，整体（从孵化到第 21 天）BWG 增加（二次，P＜0.05），FCR 改善（二次，P＜0.05），饲粮中 dgM+C 增加至≥96%。植酸酶增加了（P＜0.05）FI 和 BWG，并改善（P＜0.05）FCR，而与饲粮中的 dgM+C 百分比无关。在没有植酸酶的情况下，在饲粮中 dgM+C 为 89%～96%时，所有氨基酸的 AID 最高（二次，P＜0.05）。然而，在添加植酸酶的情况下，在饲粮中 dgM+C 为 82%时，所有氨基酸的 AID 最高（二次，P＜0.05），并且在所有 dgM+C 水平下，添加植酸酶的氨基酸 AID 均高于未添加植酸酶的饲粮（dgM+C×植酸酶，P＜0.05）。总之，植酸酶提高了所有氨基酸的 AID，并改善了生长性能，而与饲粮中的 dgM+C 水平无关。