Effects of GnRH treatment on superovulatory responses of dairy cows

Twenty-eight Holstein cows were randomly divided into two groups. Group received 50 mg of FSH-P intramuscularly in declining doses for five days. Cows in group II received the same treatment as those in Group I but were also administered 250 ug of GnRH on the day of expected estrus. Neither the mean number of corpora lutea palpated nor the mean number of embryos recovered nonsurgically was different (P0.05) between treatments. However, administration of GnRH resulted in a higher fertilization rate and recovery of more developing embryos.