Effects of Cyclic Heat Stress on Breathing Function, Growth Performance and Liver Antioxidant Function of Yellow-Feathered Broilers

ZHONG Guang, SHAO Dan, SHI Shourong, TONG Haibing, SONG Zhigang

doi:10.3969/j.issn.1006-267x.2018.03.018

2018 , Vol. 30 >Issue 3: 947 - 952

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.03.018

Molecular Nutrition

Effects of Cyclic Heat Stress on Breathing Function, Growth Performance and Liver Antioxidant Function of Yellow-Feathered Broilers

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1. College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018, China;
2. Poultry Institute, Chinese Academy of Agricultural Sciences, Yangzhou 225125, China

Received date: 2017-09-27

Online published: 2018-03-05

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Abstract

This study was designed to investigate the effects of cyclic heat stress on breathing function, growth performance and liver antioxidant function of yellow-feathered broilers. A total of 144 thirty-five-day-old yellow-feathered broilers with similar body weight were randomly divided into 2 groups (normal temperature group and cyclic heat stress group) with 12 replicates per group and 6 chicks per replicate. Broilers in the two group were all fed the basal diets, the temperature for normal temperature group next day (26.0±0.5)℃, while the cyclic heat stress group received cyclic heat stress:20:00 to next day 08:00 was 26℃, 08:00 to 12:00 and 16:00 to 20:00 was 30℃, 12:00 to 16:00 was 34℃. The experimental lasted for 6 days. The results showed that after 2 days of cyclic heat stress, the comb temperature, wing temperature, rectal temperature, breathing rate, ratio of feed to gain (F/G) and liver protein carbonyl content of cyclic heat stress group were significantly higher than those of normal temperature group (P<0.05), however, the average daily feed intake (ADFI), average daily gain (ADG) and activities of catalase (CAT) and superoxide dismutase (SOD) in liver were significantly lower than those of normal temperature group (P<0.05). After 6 days of cyclic heat stress, the comb temperature, breathing rate, F/G and liver protein carbonyl content of cyclic heat stress group were significantly higher than those of normal temperature group (P<0.05), however, the ADFI, ADG and activities of CAT, SOD and glutathione peroxidase and content of glutathione in liver were significantly lower than those of normal temperature group (P<0.05). In conclusion, cyclic heat stress can increase body temperature, improve breathing function, reduce the growth performance and liver antioxidant function of yellow-feathered broilers.

Key words： yellow-feathered broiler; cyclic heat stress; breathing function; growth performance; antioxidant function

Cite this article

ZHONG Guang, SHAO Dan, SHI Shourong, TONG Haibing, SONG Zhigang . Effects of Cyclic Heat Stress on Breathing Function, Growth Performance and Liver Antioxidant Function of Yellow-Feathered Broilers[J]. Chinese Journal of Animal Nutrition, 2018 , 30(3) : 947 -952 . DOI: 10.3969/j.issn.1006-267x.2018.03.018

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