Effects of L-arginine and L-citrulline supplementation in reduced protein diets for broilers under normal and cyclic warm temperature

• 作者: Hiep Thi Dao Nishchal K.Sharma Emma J.Bradbury Robert A.Swick
• 来源期刊: 动物营养（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: POULTRY NUTRITION
• 页码范围: 927-938
• 页数: 12页
• 语种: 英文

摘要

Heat stress causes significant economic losses in the broiler industry.Dietary supplementation of argi-nine (Arg) and citrulline (Cit) might increase the performance of broilers raised under warm temperature due to vasodilation effects.This study investigated the effects of L-Arg or L-Cit supplementation in broilers fed a reduced protein wheat-based diet deficient in Arg under thermoneutral (NT) and cyclic warm temperature (WT).Ross 308 cockerels (n =720) were randomly allocated to 4 dietary treatments with 12 replicates of 15 birds per pen from d 7 to 21.The 4 treatments were:normal protein (NP),i.e.,22.3％ and 20.9％ crude protein in grower and finisher,respectively;reduced protein (RP),i.e.,2.5％ lower protein and deficient in Arg;and RP supplemented with 0.28％ Arg (RP-Arg) or 0.28％ Cit (RP-Cit).A factorial arrangement of treatments was applied during the finisher phase (21 to 35 d).Factors were:diet(4 diets above);and temperature,NT (24 ℃) or cyclic WT (33 ± 1 ℃ for 6 h per day) with 6 replicate pens per treatment.During 7 to 35 d and 21 to 35 d,the birds fed the RP diet had lower body weight gain(BWG) and higher FCR compared to the NP diet (P ＜ 0.01).The addition of Arg or Cit to RP decreased FCR compared to RP (P ＜ 0.01).During 21 to 35 d,the birds exposed to WT had lower feed intake (FI),lower BWG (P ＜ 0.001) but similar FCR (P ＞ 0.05) compared to birds exposed to NT.Diet by temperature in-teractions were not observed for performance parameters during the period of WT (P ＞ 0.05).On d 35,the RP-fed birds had a lower yield of thigh and drumstick,higher fat pad,lower femur ash,and breaking strength but similar serum uric acid level and higher nitrogen digestibility on d 21 compared to those offered NP (P ＜ 0.05).Supplementation of Arg or Cit to RP resulted in increased femur ash on d 35(P ＜ 0.05).Thus,feeding the NP diets is necessary to maintain growth performance in broilers regardless of the temperature conditions.