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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Non-invasive Study on Physiological Responses of Captive Przewalski's horses (Equus przewalskii) in High Temperature Period of Summer
Author of the article:JI Shengnan1, XIAO Nengwen1, DENG Huaiqing2*, HU Defu3
Author's Workplace:1.Biodiversity Research Center, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 2.School of Life Sciences, Guizhou Normal University, Guiyang 550001, China; 3.School of Nature Conservation, Beijing Forestry University, Beijing 10083, China
Key Words:Equus przewalskii; high temperature stimulation; non-invasive sampling method; glucocorticoid metabolites; thyroid T3 metabolites
Abstract:Physiological responses of captive Przewalski’s horses (Equus przewalskii) in high temperature period of summer were investigated at Xinjiang Wild Horse Breeding and Research Center using radioimmunoassay by the non-invasive sampling method. We randomly selected five adult male horses, five adult female horses and five lactating female horses from five family groups, to measure the fecal metabolites of glucocorticoid and thyroid T3. The results show that (1) Przewalski's horses have maintained high level of hormones in summer; (2) glucocorticoid metabolites in three groups were significant different (Multivariate test of general linear model, F2, 60=22.885, P<0.001), and the order was male > female > lactating female; (3) Similarly, thyroid T3 metabolites in different groups were also significantly different (Multivariate test of general linear model, F2, 60=37.780, P<0.001), which order was female > male > lactating female; (4) However, the hormones performed no significant difference in various levels of heat stress (THI>28.9 vs. THI≤28.9). Meanwhile, there was no interaction between group and stress level. Overall, the captive Przewalski’s horses performed different physiological responses to high temperature stimulation in summer. In light of these results, we propose that should be feed separately to prevent accidental injury caused by high temperature in summer of Xinjiang. Moreover, the noninvasive measurement of fecal glucocorticoid and thyroid T3 can be introduced as a monitoring method for captive Przewalski’s horses during high temperature period of summer, and provide a scientific basis for artificial management.
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