Protein sources and starch-protein digestive dynamics manipulate growth performance in broiler chickens defined by an equilateraltriangle response surface design

作     者：Shemil P.Macelline Peter V.Chrystal Peter H.Selle Sonia Y.Liu Shemil P.Macelline;Peter V.Chrystal;Peter H.Selle;Sonia Y.Liu

作者机构：Poultry Research FoundationThe University of SydneyCamden NSW 2570Australia School of Life and Environmental SciencesFaculty of ScienceThe University of SydneySydney NSW 2006Australia Sydney School of Veterinary ScienceThe University of SydneySydney NSW 2006Australia 

出 版 物：《Animal Nutrition》 (动物营养（英文版）)

年 卷 期：2022年第9卷第2期

页      面：204-213页

核心收录：

学科分类：090502[农学-动物营养与饲料科学] 0905[农学-畜牧学] 0906[农学-兽医学] 09[农学] 

基　　金：Australian Research Council Discovery Early Career Researcher Award(DE190101364)for supporting Dr Sonia Liu's salary and this feeding study.We would like to acknowledge the financial support provided by Australian Government Research Training Program Scholarship(RTP)for PhD candidate Mr Shemil Macelline 

主　　题：Amino acid Digestive dynamics Glucose Protein Starch 

摘      要：A total of 360 male,off-sex Ross 308 chicks were offered 10 dietary treatments from 14 to 35 d post ehatch in an equilateral-triangle response surface design feeding study in order to confirm the importance of protein and amino acid digestive dynamics in broiler *** 3 apical diets were nutritionally-equivalent containing either soybean meal,non-bound amino acids or whey protein concentrate as the major source of dietary protein and amino *** blends of the 3 apical diets comprised the balance of 7 diets and each dietary treatment was offered to 6 replicate cages with 6 birds per *** performance,nutrient utilisation,apparent protein and starch digestibility coefficients were determined in 4 small intestinal *** optimal weight gain(2,085 g/bird)and feed conversion ratios(FCR,1.397)were generated by Diet 50S50W which included a 50:50 blend of apical diets rich in whey protein concentrate and soybean *** chickens offered Diet 50S50W also had the highest experimental and predicted jejunal digestibility(0.685 in proximal jejunum and 0.823 in distal jejunum).FCR was not correlated with apparent distal ileal digestibility coefficient(P0.05)of protein but was correlated with apparent protein digestibility in proximal jejunum(r=-0.369,P=0.040)and distal jejunum(r=-0.316,P=0.015).Surplus dietary starch was correlated with increased fat pad weight(r=0.781,P?0.008).The findings confirmed the relevance of protein digestion rate,reflected by jejunal digestibility,on feed conversion of broiler chickens.A balance between protein-bound and non-bound crystalline or synthetic amino acids may be required for optimal growth and protein digestion.