PDCA - One Blog

Welcome to the first Dexter cattle blog to disseminate information for members of the Purebred Dexter Cattle Association of North America (PDCA) and for those with a curiosity about Irish Dexter cattle, cattle in general, as well as news from the PDCA. Expressions of opinion are to not be regarded as expressing the official opinion of the PDCA unless expressly stated. Hopefully you will find something here of interest and don't overlook browsing through the archives. Comments are welcomed.

Tuesday, May 17, 2005

Timing of Service or Insemination

Artificial insemination or natural service lead to a pregnancy only if the spermatozoa are "at the right place at the right time." The egg is released from the ovary about 10 to 14 hours after the end of heat and can only survive unfertilized for six to 12 hours. In contrast, the spermatozoa may live up to 24 hours in the reproductive tract of a cow. A common recommendation for the best timing of artificial insemination is the "morning-evening" rule: cows observed in heat in the morning are inseminated the same evening, and cows observed in heat in the afternoon are inseminated the next morning.

In the case of natural service, the cow and the bull may be allowed to mate starting a few hours after the cow accepts mounting until the cow refuses to be mounted.

The Babcock Institute - Michel A. Wattiaux

PDCA - One Google