文献类型：期刊文献

英文题名：Effects of Dietary Betaine on Growth Performance, Digestive Function, Carcass Traits, and Meat Quality in Indigenous Yellow-Feathered Broilers under Long-Term Heat Stress

作者：Liu, Wenchao[1];Yuan, Yilin[1];Sun, Chenyu[1];Balasubramanian, Balamuralikrishnan[2];Zhao, Zhihui[1];An, Lilong[1]

机构：[1]Guangdong Ocean Univ, Coll Agr, Dept Anim Sci, Zhanjiang 524088, Peoples R China;[2]Sejong Univ, Dept Food Sci & Biotechnol, Coll Life Sci, Seoul 05006, South Korea

年份：2019

卷号：9

期号：8

外文期刊名：ANIMALS

收录：SCI-EXPANDED(收录号：WOS:000483726700088)、、Scopus(收录号：2-s2.0-85070633938)、WOS

基金：This research was funded by Talent Research Start-up Project of Guangdong Ocean University (R18007); Innovative Strong School Engineering Youth Talent Project (2017KQNCX090) and Key Platform Projects (2018302) by Department of Education in Guangdong Province; Natural Science Foundation of Guangdong Province (2018A030307023); Pandeng Program of Guangdong Province (pdjh2019b0234); and National Research Foundation grant (2018R1C1B5086232) funded by Korean Government (MEST).

语种：英文

外文关键词：broilers; digestive function; heat stress; indigenous yellow-feathered breed

外文摘要：Simple Summary Heat stress, one of the major problems in tropical and subtropical regions, adversely affects poultry production. This study was designed to evaluate the effects of dietary betaine on growth performance, digestive function, carcass traits, and meat quality in indigenous yellow-feathered broilers subjected to long-term heat stress. The results demonstrated that long-term heat exposure reduced the growth performance, digestive function, and carcass yield, and dietary betaine supplementation partially alleviated the adverse effects of heat stress on these parameters. These findings are useful for development of anti-heat stress feed additives in indigenous yellow-feathered broilers. Heat stress has a profound effect on poultry health and productivity. The present study evaluated whether feeding betaine could ameliorate long-term heat stress-induced impairment of productive performance in indigenous yellow-feathered broilers. A total of 240 five-week-old male broilers were randomly allocated to five treatments with six replicates of eight broilers each. The five treatments included a thermoneutral zone control group (TN, fed basal diet), a heat stress control group (HS, fed basal diet), and an HS control group supplemented 500, 1000, 2000 mg/kg betaine, respectively. The TN group was raised at 26 +/- 1 degrees C during the whole study, HS groups exposed to 32 +/- 1 degrees C for 8 h/day from 9:00 am to 17:00 pm. The results showed that heat stress decreased the body weight gain (BWG) and feed intake of broilers during 1-5, 6-10, and 1-10 weeks (p < 0.05). Dietary betaine tended to improve the BWG and feed intake of broilers under 5 weeks of heat stress (linear, p < 0.10), and betaine supplementation linearly increased the BWG and feed intake during 6-10 and 1-10 weeks (p < 0.05). Additionally, nitrogen retention was reduced by 5 weeks and 10 weeks of heat stress (p < 0.05), whereas dietary betaine could improve nitrogen retention in heat stressed broilers after both 5 and 10 weeks of heat stress (linear, p < 0.05). Moreover, this study observed that the trypsin activity of jejunum was decreased by 5 weeks of heat stress (p < 0.05), whereas betaine supplementation had quadratic effects on trypsin activity of jejunum in heat stressed broilers (p < 0.05). Furthermore, 10 weeks of heat stress induced a reduction of villus height of the duodenum and jejunum (p < 0.05), and decreased the villus height to crypt depth ratio of the jejunum (p < 0.05). Supplementation with betaine ameliorated the adverse effects of heat stress on these parameters (p < 0.05). Compared with the TN group, 10 weeks of heat stress reduced carcass and breast yield (p < 0.05) and betaine supplementation improved carcass and breast yield of heat stressed broilers (linear, p < 0.05). In conclusion, dietary supplementation of betaine could reduce the detrimental effects of long-term heat stress on growth performance, digestive function, and carcass traits in indigenous yellow-feathered broilers.