Twelve mature British crossbred cows were randomly divided into two equal groups. Group A was fed no monensin while group B received 200 mg/head/day. Superovulation with follicle stimulating hormone (FSH) was attempted in all cows between days 9 and 11 of the estrous cycle. The number of corpora lutea per treated cow was significantly greater (P<0.05) than in controls. The number of ova recovered per cow was not significantly different between the two groups. Mean total luteal weight was significantly greater for monensin-treated cows. Embryo viability was determined using fluorescein diacetate (FDA) and was found to be similar in both groups.
The effects of dietary monensin sodium upon superovulation and embyro viability from mature cows. Publishing Authors By Initials