Effect of three anthelmintics on weight gain of feedlot cattle.

Three groups of 50 heavy feedlot steers were treated with 1 of 3 anthelmintics (haloxon, tramisol, or thiabendazole). One group of 50 steers was not treated and served as a control. The initial degree of infection with gastrointestinal nematodes was light and decreased during the course of the study. There were no significant differences in weight gains among any of the groups at the end of a 113-day feeding period.