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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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Your Position :Home->Past Journals Catalog->2021 Vol.40 No.5

Effect of Critical Point Temperature of Thermal Neutral Zone on Energy Budget of Lactating Striped Hamsters
Author of the article:WANG Guiying1, CAO Jing2, ZHAO Zhijun2
Author's Workplace:1. School of Agricultural Science, Liaocheng University, Liaocheng, Shandong Province 252059, China;
2. College of Life and Environmental Science, Wenzhou University, Wenzhou, Zhejiang Province 325035, China
Key Words:Cricetulus barabensis; maximum energy budget; prolactin; thermal neutral zone; uncoupling protein 1
Abstract:In this study, the energy budget, serum prolactin levels and mRNA expression of uncoupling protein 1 in brown adipose tissue (BAT UCP1) of lactating striped hamsters (Cricetulus barabensis) at the upper and lower points of thermal neutral zone (25℃ and 32.5℃) were measured. The results showed that the resting metabolic rate, the rate of thermal conductance, gross energy intake, milk energy output and litter mass of striped hamsters were significantly lower at 32.5℃ than those at 25℃. The expression of BAT UCP1 was significantly down-regulated at 32.5℃ compared to that at 25℃. In addition, the serum prolactin levels, and the expression of neuropeptide Y and agouti-related protein of hypothalamus were not significantly different between the two temperatures. These findings suggest that the upper point of thermal neutral zone considerably inhibits the maximum energy budget, and thus provide a support for the "heat dissipation limitation hypothesis". The prolactin-mediated neuroendocrine pathway may be not involved in the heat dissipation limitation on maximum energy budgets in lactating striped hamsters.
2021,40(5): 481-488 收稿日期:2021-03-01
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