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A common failure in embryo transfer programs is the selection and preparation of recipients. I am often asked which breed should be selected for receiving embryos. To date there is no evidence that any Bos Taurus (British and European) breed is superior. However, many years ago we found Bos...

Student Quarters for Field Experiments I’ve always been interested in history so I thought it would be interesting to briefly look back at the developments in my field of bovine reproduction and as the saying goes learn from history, so our activities over the past may point out our failures...

Demonstrating the damage caused by poor transfer techniques Frequently I have heard of artificial insemination (AI) technicians claiming higher pregnancy rates when semen is placed in the uterine horns. However, a study (Can. VET. J. 1965) reported that AI technicians frequently deposited semen...

The survival of frozen-thawed-transferred embryos depends on several factors, and they are based on a subjective classification of quality expressed as #1, 2 or 3 meaning excellent, good or fair quality. However, classification is not 100% reliable as the grading scores vary among practitioners...

We received several calls this summer regarding below average embryo collections and unsatisfactory pregnancy results in recipients. These concerns led to the creation of this month’s newsletter which addresses heat stress and its effects on bovine reproduction. Global warming is a term we are...

Unacceptable low pregnancy rates can be due to poor management practices of donors and recipients and not the often expected poor embryo technology. The most common practices causing stress can be divided into, incorrect condition of donors and recipients, transportation problems, rough...