Comparative Efficacy of Two Ivermectin Pour-on Anthelmintics in Beef Steers in a Commercial Feedyard

Abstract

Parasitism leads to decreased performance and quality of life in cattle. Producers often treat or prevent parasitism with a number of approved brand name and generic anthelmintics. Generic products generally have a cost advantage for beef producers when compared to trade-name products. Data comparing brand-name anthelmintic efficacy to that of generic in feedlot cattle are limited. Feedyards must balance efficacy and cost of administration when deciding between brand-name and generic anthelmintics. The objective of this study was to compare the efficacy of Vetrimec® pour-on and Ivomec® pour-on by utilizing the fecal egg reduction test in newly arrived feedlot steers.