首页|Increasing concentrations of dietary threonine,tryptophan,and glycine improve growth performance and intestinal health with decreasing stress responses in broiler chickens raised under multiple stress conditions

Increasing concentrations of dietary threonine,tryptophan,and glycine improve growth performance and intestinal health with decreasing stress responses in broiler chickens raised under multiple stress conditions

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The current study aimed to compare the effects of increasing concentrations of dietary threonine(Thr),tryptophan(Trp),and glycine(Gly)on growth performance,stress biomarkers,and intestinal function in broiler chickens under multiple stress conditions.Five hundred sixty broiler chickens at 21 d old were randomly allotted to 5 treatments with 8 replicates.Birds in a positive control(PC)treatment were raised under low stock density(16.9 birds/m2 per cage)with recommended environmental conditions,whereas birds in 4 treatments were subjected to multiple stress conditions:a cyclic heat stress of 30±0.3 ℃ for 10 h and 23±0.2 ℃ for 14 h per day with high stock density(25.3 birds/m2 per cage).A basal diet was assigned to both PC and negative control(NC)treatments.Three additional diets were individually formulated to contain double concentrations of digestible Thr,Trp,or Gly+Ser compared with their concentrations in the basal diet.The experiment lasted for 14 d.Results showed that NC treatment had less growth performance(P＜0.001),jejunal goblet cell counts(P=0.018),and trans-epithelial electrical resistance(TEER;P＜0.001),but greater(P=0.026)feather corticosterone(CORT)concentrations than PC treatment.Thr treatment showed the least(P＜0.001)feed conversion ratio(FCR)among treatments under multiple stress conditions.Thr,Trp,and Gly treatments had less(P=0.026)feather CORT con-centrations,but had greater(P＜0.001)TEER than NC treatment.In conclusion,increasing concentrations of dietary Thr,Trp,or Gly improve the growth performance and intestinal health in broiler chickens with decreasing stress response under multiple stress conditions.

Broiler chickenGlycineMultiple stressThreonineTryptophan

Hyun Woo Kim、Jong Hyuk Kim、Gi Ppeum Han、Dong Yong Kil

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Department of Animal Science and Technology,Chung-Ang University,Anseong-si,Gyeonggi-do 17546,Republic of Korea

Department of Animal Science,Chungbuk National University,Cheongju 28644,Republic of Korea

Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of EducationChung-Ang University Graduate Research Scholarship in 2023

2021R111A1A010501414

2024

10.1016/j.aninu.2024.03.018

动物营养(英文)

动物营养(英文)

CSTPCD
ISSN：
年,卷(期)：2024.18(3)