| Project/Area Number |
04660309
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
畜産化学
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| Research Institution | Kagoshima University |
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Principal Investigator |
HAYASHI Kunioki Kagoshima University Faculty of Agriculture Associate Professor, 農学部, 助教授 (80041656)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1993: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Broiler / Hot Environment / Muscle protein turnover / Thyroxine / Corticosterone |
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| Research Abstract |
Four experiments were conducted to clarify the effect of environmental temperature on the performance, plasma hormones concentrations and skeletal muscle protein turnover rate in force-fed broiler chicken.
In experiment 1, the performance and rates of skeletal muscle protein synthesis and breakdown of chickens were measured under high (34ﾟC) and low (19ﾟC) environmental temperatures. The performance including muscle growth was superior in the moderate environment (25ﾟC) than in the hot and the cool environments despite the birds were force-fed. However, both the rates of muscle protein synthesis and breakdown were significantly lower in the hot environment. Inexperiment 2, the role of thyroid function in decreasing muscle protein turnover under hot environment was examined. The rates of protein synthesis and breakdown were decreased in the hot environment and the decreased rates of protein synthesis and breakdown were normalized by thyroxine administration. Experiment 3 and 4 were conducted to clarify the effect of ambient temperature on muscle protein turnover, heat production and plasma concentrations of thyroxine and corticosterone. The rates of protein synthesis and breakdown and heat production were lower in the warmer environment as was expected and both plasma thyroxine and corticosterone were also lower in the warmer environment. This indicates that corticosterone as well as thyroid hormone may play important roles in decreasing heat production and protein turnover when exposed to hot environment, suggesting a mechanism of the growth retardation due to heat.
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