Effects of Shipping and Heat Stress on Embryonic Mortality in Cattle
Sarah Fields, Graduate Research Assistant in Beef Reproduction, and Dr. George Perry, Beef Reproduction and Management Specialist, SDSU Animal and Range Sciences Department
Embryonic loss is the greatest economic loss in the cow/calf industry, affecting number of cows carrying to term and percent calf crop weaned.
Fertilization rates are usually between 90% and 100% when semen is present at ovulation. Fertilization usually takes place, but conception rates (number of animals that conceive divided by number of animals inseminated) are usually around 70% for natural service or artificial insemination.