Zaoral J, Ríha J
Vet Med (Praha). 1979 Aug;24(8):475-82.
A pilot experiment with heifer heat synchronization with chlorsuperlutin-soked intravaginal tampons was conducted with 254 heifers in six herds in the North Moravian region. The rubber-foam tampons, cylindrical in shape (diameter 70 mm, height 70-90 mm), were introduced into the cranial part of the vagina, using an applicator and a vaginal speculum. Sixteen days after introduction, the tampons were removed by pulling the silon thread with which the tampons were cross-stitched. The heifers were inseminated on the second to fifth day after the removal of the tampons. The average performance in the application of the tampons was 38.5 tampons per hour, and in their removal 20.7 tampons per hour. The retention rate of the tampons was 97.6%; out of this, 79.8% of the tampons were pulled out by the silon thread. The signs of heat were good, 87.9% of the heifers could be inseminated intrauterinally. All the heifers with retained tampons were inseminated. The conception rate after the first insemination was 32.7%, after the second insemination 56.4%, and after two inseminations 68.1%. Out of the synchronized heifers, 8.1% were culled for slaughter. The drawbacks of this treatment include the low conception rate of the synchronized heifers, a high requirement for repeated insemination in the synchronized oestrus, and, consequently, a high sperm consumption.
在北摩拉维亚地区的六个牛群中，对254头小母牛进行了一项使用氯孕酮浸泡的阴道内棉塞进行发情同步化的试点实验。橡胶泡沫棉塞呈圆柱形（直径70毫米，高度70 - 90毫米），使用涂抹器和阴道窥器将其插入阴道的颅部。插入16天后，通过拉动与棉塞交叉缝合的硅酮线将棉塞取出。小母牛在取出棉塞后的第二天至第五天进行授精。棉塞插入的平均操作速度为每小时38.5个棉塞，取出的平均速度为每小时20.7个棉塞。棉塞的留存率为97.6%；其中，79.8%的棉塞是通过硅酮线拉出的。发情迹象良好，87.9%的小母牛可进行子宫内授精。所有留存棉塞的小母牛都进行了授精。第一次授精后的受孕率为32.7%，第二次授精后为56.4%，两次授精后为68.1%。在同步发情的小母牛中，8.1%被淘汰屠宰。这种处理方法的缺点包括同步发情的小母牛受孕率低、同步发情时对重复授精的要求高，因此精子消耗量也高。
