Repeat Breeding Share
Normally cyclic cows with no clinical abnormalities that have failed to conceive after at least three successive inseminations.
In herds where conception rates are commonly 50-55%, one would expect about 9-12% of those cows to be repeat breeders.
|
Early Repeats | Late Repeats |
---|---|---|
Cows come into heat | Within 17-24 days after AI | Later than 25 days after AI |
Luteal function | Shorter than normal | Longer than normal |
Causes | Failure of fertilization (delayed ovulation, poor semen quality) Early embryonic death (delayed ovulation, poor embryo quality, unfavorable uterine environment, precocious luteolysis) |
Inadequate luteal function, inadequate embryo signalling, infectious diseases, induced luteolysis |