Effects of Extended-release Eprinomectin on Cow/calf Performance and Reproductive Success in a Fall-calving Herd

Abstract

This study evaluated the effects of extended-release eprinomectin on performance parameters and reproductive efficiency of fall-calving cows. Cows were treated with either a conventional, short duration dewormer (CONV) or an injectable extended-release eprinomectin (EPR). Change in body weight (BW) and average daily gain were greater in EPR cows compared to CONV treated cows. Pregnancy rates tended to be greater for EPR than CONV cows. Calves from dams treated with EPR were younger at weaning, but had greater weaning weights than calves from CONV dams. Results from this study indicate performance and reproductive advantages for dams treated with EPR as well as possible indirect performance advantages for calves whose dams were treated with EPR.