首页 | 本学科首页   官方微博 | 高级检索  
     


Effects of AI protocol and time interval from onset of estrus to AI on conception rate in Japanese Black cows
Authors:Koichiro HEMMI  Ikuo KOBAYASHI  Makoto KAJISA  Go KITAHARA  Kiichi FUKUYAMA  Hiroshi HARADA  Shunichi KAMIMURA
Affiliation:1. Faculty of Agriculture, University of Miyazaki, Miyazaki;2. Soo Agricultural Mutual Aid Association, Kagoshima, Japan
Abstract:
Two different artificial insemination (AI) protocols were investigated to determine the effect of the time interval from the onset of estrus (as detected by a pedometer) to the AI on the conception rate in Japanese Black cows. Seventy‐three cows were divided into two groups that received AI either after the induction of synchronized ovulation (synchronized AI group; n = 26) or at the time of observed estrus (control AI group; n = 47). Each group was further divided into two subgroups, which were artificially inseminated either 0–12 h (early AI group; n = 21) or 12–24 h (late AI group; n = 52) after the onset of estrus. There was no significant difference in the conception rate between the synchronized AI and control AI groups. The AI protocol and the detection of estrus using a threshold of counted steps (as measured by a pedometer) in this study could be effective for planned reproduction management without the observation of standing estrus in Japanese Black cows.
Keywords:conception rate  Japanese Black cows  pedometer  synchronized AI  timing
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号