期刊
POULTRY SCIENCE
卷 99, 期 1, 页码 142-150出版社
ELSEVIER
DOI: 10.3382/ps/pez571
关键词
broiler chicken; heat stress; synbiotic; intestinal histomorphology; heat shock protein 70
资金
- National Natural Science Foundation of China [31702307]
- Fundamental Research Funds for the Central Universities [XDJK2019BO13]
- USDA-NIFA-AFRI [2017-67015-26567]
- Egyptian Cultural and Educational Bureau (ECEB) in Washington DC., Ministry of Higher Education and Scientific Research, Egypt
This.study examined effect of a dietary synbiotic supplement on the concentrations of plasma thyroid hormones, expressions of heat shock protein 70 (HSP70), and intestinal histomorphology in broiler chickens exposed to cyclic heat stress (HS). Three hundred and sixty day old male Ross 708 broiler chicks were randomly distributed among 3 dietary treatments containing a synbiotic (PoultryStar me(US)) at 0 (control), 0.5 (0.5x), and 1.0 (1.0x) g/kg. Each treatment contained 8 replicates of 15 birds each housed in floor pens in a temperature and lighting controlled room. Heat stimulation was established from days 15 to 42 at 32 degrees C for 9 h daily. The results indicated that under the HS condition, both synbiotic fed groups had lower liver and hypothalamus HSP70 levels (P < 0.001) compared to control group; however, HSP70 mRNA expression was not different among treatments (P > 0.05). There were no treatment effects on the levels of triiodothyronine (T-3) and thyroxine (T-4) as well as T-3/T-4 ratio (P > 0.05). Compared to controls, 1.0 x HS broilers had greater villus height in the duodenum (P < 0.01), and greater villus height and villus height:crypt depth ratios in the ileum (P < 0.01). There were no differences among treatments on the measured intestinal parameters in the jejunum (P > 0.05). The results suggest that the synbiotic may ameliorate the negative effects of HS on chicken health as indicated by the changes in the intestinal architecture and the levels of HSP70. Dietary synbiotic supplement could be a feasible nutritive strategy for the poultry industry to improve the health and welfare of chickens when exposed to hot environmental temperature.
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