Effects of Moist-Heat Stress on Growth Performance, Oxidation Resistance and Immunity of Tibetan Sheep and Goats

ZHANG Can, WANG Zhisheng, PENG Quanhui, ZOU Huawei, JING Xiaoping, PU Qijian

doi:10.3969/j.issn.1006-267x.2017.06.041

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 6: 2179 - 2187

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.06.041

Molecular Nutrition

Effects of Moist-Heat Stress on Growth Performance, Oxidation Resistance and Immunity of Tibetan Sheep and Goats

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Institute of Animal Nutrition, Sichuan Agricultural University, Ya'an 625014, China

Received date: 2016-12-14

Online published: 2017-06-07

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Abstract

The present study was conducted to investigate the variation regularities of serum hormone, antioxidant and immune indices of Tibetan sheep and goats raised under the same nutritional condition with moist-heat environment, and aimed to reveal the different effects of moist-heat stress on growth performance, oxidation resistance and immunity between Tibetan sheep and goats. Six individuals of Tibetan sheep and goats (Boar goat×local yellow goat) were selected based on similar age and body weight[(45.83±3.54) kg]. Feeding experiment lasted for 135 days, including a 15-day adaption period and another 120-day text period. Temperature and humidity of sheep barn were measured daily and temperature-humidity index (THI) was calculated, and serum related indices of Tibetan sheep and goats were monitored monthly. The results showed as follows:1) the THI of sheep barn was significantly raised in May to July along with month increasing (P<0.05). The THI of sheep barn was above 72 in June to August so that this period was regarded as the moist-heat stress period. 2) Respiratory rate and rectal temperature of Tibetan sheep and goats were all significantly increased in July and August compared with those in May (P<0.05). Compared with goats, Tibetan sheep presented a significantly higher respiratory rate and rectal temperature during the moist-heat stress period (P<0.05). 3) During the text period, the maximal decrease of dry matter intake (DMI) of Tibetan sheep and goats was 10.70% and 10.44%, respectively, besided, the maximal decrease of average daily gain was 50.00% and 47.82%, respectively. 4) The THI of sheep barn was raised from 71.17 (May) to 76.82 (July) resulted in a significant rise in serum cortisol and insulin concentrations (P<0.05) accompanied with a significant reduction in serum glucose and triiodothyronine concentrations (P<0.05). The maximal amplifications in serum growth hormone and thyroxine concentrations of Tibetan sheep were larger than those of goats under moist-heat stress. 5) In addition to the serum total antioxidant capacity (T-AOC) of Tibetan sheep (July) and goats (August), the serum superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) activities and T-AOC in July and August were all significantly decreased compared with those in May (P<0.05), while the serum malondialdehyde (MDA) concentration was significantly increased (P<0.05). Under moist-heat stress, the variation ranges of serum SOD activity, T-AOC and MDA concentration of goats were larger than those of Tibetan sheep. 6) The serum immunoglobulin A (IgA), immunoglobulin M (IgM), immunoglobulin G (IgG) and interleukin-2 (IL-2) concentrations of Tibetan sheep and goats were all significantly decreased in August compared with those in May (P<0.05), while the serum tumor necrosis factor-α (TNF-α) concentration was significantly increased (P<0.05). Under moist-heat stress, the variation ranges of serum immunoglobulin, IL-2 and TNF-α concentrations of Tibetan sheep were larger than those of goats. It is concluded that moist-heat stress increase the respiratory rate and rectal temperature in both Tibetan sheep and goats accompanied with the decrease of growth performance, oxidation resistance and immunity. The Tibetan sheep is affected severer by moist-heat stress on growth performance and immunity, whereas the oxidation resistance of goat is affected severer by moist-heat stress.

Key words： moist-heat stress; Tibetan sheep; goat; growth performance; oxidation resistance; immunity

Cite this article

ZHANG Can, WANG Zhisheng, PENG Quanhui, ZOU Huawei, JING Xiaoping, PU Qijian . Effects of Moist-Heat Stress on Growth Performance, Oxidation Resistance and Immunity of Tibetan Sheep and Goats[J]. Chinese Journal of Animal Nutrition, 2017 , 29(6) : 2179 -2187 . DOI: 10.3969/j.issn.1006-267x.2017.06.041

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