...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of dairy science >Hot topic: Successful fixed-time insemination within 21 d after first insemination by combining chemical pregnancy diagnosis on d 18 with a rapid resynchronization program
【24h】

Hot topic: Successful fixed-time insemination within 21 d after first insemination by combining chemical pregnancy diagnosis on d 18 with a rapid resynchronization program

机译：热门话题：通过将第18天的化学妊娠诊断与快速重新同步程序相结合，在首次人工授精后21 d内成功进行了固定时间授精

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Cattle that are not pregnant to first fixed-time artificial insemination (TAI) may be resynchronized for a second TAI if they are found nonpregnant at pregnancy diagnosis. The specific interval between first and second TAI ranges from 4 to 8 wk. The selected interval depends on the available method of pregnancy diagnosis and the efficiency of the resynchronization program. The objective of this experiment was to evaluate a pregnancy diagnosis and resynchronization system that achieved a 21-d interval between TAI. This 21-d interval approximates the natural return-to-service interval. It also enables resynchronization to be implemented within the same estrous cycle in which cattle are first inseminated. Holstein heifers were randomly assigned to a 21-d resynchronization program (21d_resynch; n = 40) or a control group in which estrus was observed for the purpose of re-insemination (control; n = 29). The 21d_resynch heifers were diagnosed for pregnancy on d 18 after a TAI (d 0) by using predetermined cutoff values for 2'-5' oligoadenylate synthetase 1 (Oasl) gene expression in leukocytes and plasma progesterone concentration. Heifers that were not pregnant to first TAI had greater expression of Oasl at the time of PGF_(2α) (d -3) than pregnant heifers, but this relationship was reversed on d 18 after TAI: the heifers that were pregnant to first TAI had almost 5-fold greater expression of Oasl compared with nonpregnant heifers. Nonpregnant heifers in the 21d_resynch group were injected with a luteolytic dose of PGF_(2α) on d 19 and were injected with GnRH on d 21 and submitted to TAI. The pregnancy per AI after first insemination was similar for 21d_resynch (50.0%; pregnancy diagnosis on d 18) and control (51.7%; pregnancy diagnosis on d 27). Likewise, no difference was detected in second insemination pregnancy per AI for 21d_resynch (36.8%; nonpregnant heifers TAI on d 21) and control (35.7%; nonpregnant heifers inseminated at return to estrus or after nonpregnant diagnosis on d 27). The interval between first and second insemination was shorter for 21d_resynch compared with control (21.0 ± 0 and 27.5 ± 2.1 d). The conclusion is that a TAI resynchronization can be programmed within 21 d of previous TAI when a d 18 pregnancy test and a rapid resynchronization are used.
机译：如果未在怀孕固定时间进行人工授精（TAI），未怀孕的牛在怀孕诊断时被发现未怀孕，则可以将其重新同步进行第二次TAI。第一和第二TAI之间的特定间隔范围是4到8 wk。选择的时间间隔取决于怀孕诊断的可用方法和重新同步程序的效率。该实验的目的是评估在TAI之间达到21天间隔的妊娠诊断和再同步系统。这个21天的时间间隔近似于自然的返回服务间隔。它还使重新同步可以在牛首次受精的同一发情周期内实现。荷斯坦小母牛被随机分配到21天再同步程序（21d_resynch; n = 40）或对照组，在该组中观察到发情以重新授精（对照组； n = 29）。通过使用预定的白细胞中2'-5'寡腺苷酸合成酶1（Oasl）基因表达的截止值和血浆孕酮浓度，在TAI后第18天诊断出21d_resynch小母牛怀孕。没有怀孕的小母牛在PGF_（2α）（d -3）时比怀孕的小母牛具有更高的Oasl表达，但是这种关系在TAI后的第18天被逆转：怀孕的母牛在第一次TAI时具有与未怀孕的小母牛相比，Oasl的表达增加了近5倍。在21d_resynch组中，未怀孕的小母牛在第19天注射了黄体溶解剂量的PGF_（2α），在第21天注射了GnRH，并送交TAI。初次授精后每个AI的妊娠率在21d_resynch（50.0％;在第18天的妊娠诊断）和对照（51.7％;在第27天的妊娠诊断）相似。同样，在21d_resynch（36.8％；未怀孕的小母牛TAI在第21天）和对照（35.7％;在发情期或未怀孕的诊断后第27天的授精的未怀孕小母牛）中，每个AI的第二次受精怀孕也没有差异。与对照组相比，第一次授精和第二次授精之间的间隔较短，为21d_resynch（21.0±0和27.5±2.1 d）。结论是，当使用d 18妊娠试验和快速重新同步时，可以在先前TAI的21 d内对TAI重新同步进行编程。

著录项

  • 来源
    《Journal of dairy science》 |2010年第12期|p.5668-5672|共5页
  • 作者

    J. C. Green; C. S. Okamura; D. J. Mathew; E. M. Newsom; M. C. Lucy;

  • 作者单位

    Division of Animal Science, University of Missouri, Columbia 65211;

    Division of Animal Science, University of Missouri, Columbia 65211;

    Division of Animal Science, University of Missouri, Columbia 65211;

    Division of Animal Science, University of Missouri, Columbia 65211;

    Division of Animal Science, University of Missouri, Columbia 65211;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    oasl; pregnancy; resynchronization; heifer;

    机译：绿洲怀孕;重新同步小母牛;

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号