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인공수정 후 외인성 Progesterone과 Estradiol 병용 투여 및 Progesterone 단독 투여가 젖소의 번식 성적에 미치는 영향 KCI 등재
Reproductive Performance of Holstein Cattle Treated with Progesterone and Combination of Progesterone and Estradiol
pp.115-119
본 연구는 젖소에 있어서 인공수정 후 외인성 progesterone과 estradiol을 병용 투여하거나 progesterone을 단독 투여하는 경우에 젖소의 번식 성적에 미치는 영향을 조사하기 위하여 대조군, CIDR에서 estradiol 캡슐을 부착시킨 progesterone과 estradiol 병용 투여군(P4+E2군) 및 CIDR에서 estradiol 캡슐을 제거한 progesterone 단독 투여군(P4군)로 구분하여, 인공수정 후 14일째에
This study was carried out to investigate the effects of hormones (progesterone, and combination of progesterone and estradiol) on the reproductive performance of dairy cattle. The intravaginal CIDR was inserted in the vagina of cow on day 14 post-insemination to stimulate progesterone secretion with and without estradiol. The CIDR was removed on the day of next expected estrus. The cows for control group were not treated with CIDR or hormones. Conception rate, estrus interval, estrus intensity and serum progesterone were measured. Conception rates in control, CIDR without estradiol and CIDR treated cows were 15.4, 38.9 and 60%, respectively. Estrus interval in cows treated with CIDR was 26.5 days compared with 37.1 and 48.5 days in control and CIDR without estradiol treated cows. Estrus signs were more intense in cows treated with CIDR compared with control and CIDR without estradiol treated cows. Pregnant cows treated with CIDR showed higher serum progesterone concentration than pregnant and non-pregnant cows in control group. Particularly, serum progesterone was significantly higher in CIDR treated pregnant cows compared to non-pregnant cows at days 1, 2 and 6 of gestation. It may be concluded from present results that CIDR treatment is better than CIDR without estradiol to improve conception rate in dairy cattle.
