Relationship of fertility to ovarian follicular waves before breeding in dairy cows.
Relationship of fertility to ovarian follicular waves before breeding in dairy cows.
复制标题
奶牛繁殖前生育力与卵巢卵泡波的关系。
DOI：
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发表时间：
2002
影响因子：
3.3
通讯作者：
Joy L. Pate
中科院分区：
文献类型：
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作者：
D. Townson;Paul C. W. Tsang;W. Butler;M. Frajblat;L. Griel;C. Johnson;R. Milvae;G. Niksic;Joy L. Pate
与具有三波卵泡生长的奶牛相比，在发情周期中具有两波卵泡生长的奶牛在排卵时产生的卵泡更老、更大。本研究的目的是：1）比较具有两个或三个卵泡波的奶牛的生育力; 2）检查黄体功能、卵泡发育和繁殖后生育力之间的关联。应用超声技术对106头奶牛输精前发情周期卵泡波进行了监测。在下一次发情和排卵前，三波卵泡数的奶牛显著少于两波卵泡数的奶牛（P < 0.01;分别为30%和68%），但妊娠率显著高于两波卵泡数的奶牛（P = 0.058;分别为81%和63%）。两波组发情周期短（P < 0.01），排卵卵泡大（P < 0.05），年龄大（P < 0.01）。与两波奶牛相比，三波奶牛的黄体功能延长（P < 0.05），血浆孕酮峰值出现在发情周期的较晚（P < 0.05）。考虑到怀孕的奶牛，在授精前的发情周期中，黄体期长度比未怀孕的奶牛短（P < 0.05）。总之，与两波奶牛相比，第三波卵泡排卵后授精的泌乳奶牛的生育力更高，第三波卵泡在发情周期中的天数更少。
Cows with two waves of follicular growth during the estrous cycle yield follicles that are older and larger at ovulation compared with cows having three waves. The objectives of the current research were 1) to compare fertility in cows with two or three follicular waves and 2) to examine associations between luteal function, follicular development, and fertility after breeding. Follicular waves were monitored by ultrasonography during the estrous cycle before insemination in 106 dairy cows. Fewer cows had three follicular waves before next estrus and ovulation than two waves (P < 0.01; 30% vs 68%, respectively), but pregnancy rate was higher (P = 0.058; 81 vs 63%, respectively). Cows with two waves had shorter estrous cycles (P < 0.01), with the ovulatory follicle being both larger (P < 0.05) and older (P < 0.01). In cows with three waves, luteal function was extended (P < 0.05) and the peak in plasma progesterone occurred later (P < 0.05) in the estrous cycle compared to two wave cows. Considering cows that became pregnant, luteal phase length was shorter (P < 0.05) during the estrous cycle preceding insemination than for nonpregnant cows. In conclusion, fertility was greater in lactating cows inseminated after ovulation of the third-wave follicle that had developed for fewer days of the estrous cycle as compared with two-wave cows.