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KMID : 1023520230460030227
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Korean Journal of Veterinary Service
2023 Volume.46 No. 3 p.227 ~ p.234
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Heat stress during summer reduced the ovarian aromatase expression of sows in Korea
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Kim Hwan-Deuk
Kim Sung-Ho
Lee Sang-Yup
Kim Tae-Gyun
Heo Seong-Eun
Seo Yong-Ryul
Cho Jae-Keun
Jang Min
Yun Sung-Ho
Kim Seung-Joon
Lee Won-Jae
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Abstract
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It has been addressed that heat stress due to high atmospheric temperature during summer in Korea induces impaired release of reproductive hormones, followed by occurring abnormal ovarian cyclicity, lower pregnancy ratio, and reduced litter size. Therefore, the present study attempted to compare seasonal change (spring versus summer) of the ovarian aromatase expression, an enzyme for converting testosterone into estrogen. While serum estrogen level in summer group was significantly lower than that of spring group, testosterone was not different between groups. Consistent with estrogen level, the ovarian aromatase expression in summer at follicular phase was significantly lower than the counterpart of spring. The ovarian aromatase expression was positively related with serum estrogen level significantly (r=0.689; P=0.008) and strongly negative correlation was identified (r=-0.533; P=0.078) with atmospheric temperature. The ovarian aromatase expression was not detected in immature ovarian follicles but specifically localized in the granulosa cell layers in both seasons. However, the aromatase intensity in the granulosa cell layers was stronger in spring than summer. Because testosterone level was not different between groups, it could be concluded that the lower level of estrogen during summer might be derived by not lack of substrate but lower expression of ovarian aromatase by heat stress.
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KEYWORD
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Heat stress, Aromatase, Ovary, Sow, Summer
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