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KMID : 0900919930170040325
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Korean journal of Animal Reproduction
1993 Volume.17 No. 4 p.325 ~ p.329
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Effect of Season on Testis Function and Freezing and Fertilizing Ability of Spermatozoa in Korean Native Goat II. Seasonal and Diurnal Change in Serum Testosterone Level
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Kim Chang-Keun
Lee Chang-Hee
Chung Yung-Chai
Jung Young-Ho
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Abstract
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Seasonal and diurnal variation in serum testosterone was measured by radioimmunossary in 3 mature Korean native male goats. Blood was collected at 3-h intervals for 24h in each season. Mean levels of 4 seasons ranged from 0.82 to 2.06ng/ml and no difference was among seasons, although level in fall and winter was slightly higher. Diurnal level tended to increase at daytime in all season and when diurnal variation in level was compared to daily mean of each season, level of daytime greatly(P<0.05) increased in summer. However, variation between light and dark period in other seasons did not show significant difference. Daytime increase of testosterone was found 3 to 4 after dawn and level increased 1 to 2h ahead in summer and fall than that in others. These results in serum testosterone suggest that there was no great seasonal variation in endocrine function of goat testis.
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KEYWORD
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native goat, RIA, seasonal variation, testosterone
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