An experiment examining the benefit of treating repeat-breeders with 100
µg GnRH (Cystorelin ®) at the time of third or fourth insemination was conducted
in 513 dairy cows of which 93 (abnormal cows) had been diagnosed previously
(during the 60 to 90 days postpartum) as having reproductive disorders, including
retained placenta, uterine infections, prolonged anestrus, and cystic ovaries.
Treatment with GnRH improved conception in normal and abnormal repeat-breeding
cows by 13 percentage points or 42%