Nutritional management affects embryo development, pregnancy.

Nutritional management affects embryo development, pregnancy.

Troy Smith

Angus Journal

Contrary to what most cattlemen may think, fertilization rates among  beef cows and heifers bred by artificial  insemination (AI) are quite high.  According to South Dakota State University  Reproductive Physiologist George Perry,  fertilization is successful about 90% of the  time when animals are detected in estrus  and semen is present at the time ovulation  occurs. So why is it that most well-managed  AI programs result in just 70%, or even fewer,  AI-sired calves?  

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