Effect of ivermectin on weightgains of yearling steers on pasture in central Alberta
Canadian Veterinary Journal
Canadian Veterinary Medical Association
The use of anthelmintics for the control of parasites is an important part of cattle management in Alberta. When evaluating new anthelmintics, requirements such as efficacy against adult and immature parasites, degree of toxicity, and cost per treatment to the user need to be considered. The discovery of a new family of anthelmintic agents (the avermectins) in 1979 (1-3) has resulted in a number of reports establishing the efficacy of one member of the family, ivermectin, against many nematode and arthropod parasites (e.g. 4-8). Although research has confirmed the efficacy of ivermectin under field conditions (9), the economic benefit to farmers raising cattle on pasture in Alberta has not been determined. The present investigation was conducted to evaluate the efficacy and economic advantage of two treatments with ivermectin in naturally infected yearling steers.
Kennedy, M.J., D.R. ZoBell, and L.A. Goonewardene. 1989. Effect of ivermectin on weight gains of yearling steers on pasture in central Alberta. Can. Vet. J. 30:346-347.