strategic parasite control has been reported to improve performance in a beef cow / calf herd that does not demonstrate clinical parasitism. this study was conducted to determine if strategic anthelmintic treatment at turnout and at midsummer would improve growth and reproduction. Two cow / calf groups of similar composition were grazed on separate, but equivalent pastures in the spring, and at midsummer, they were moved grazed on separate, but equivalent pastures in the spring, and at midsummer, they were moved to new pastures. The treated group was given fenbendazole at turnout (cows) and at midsummer (cows and calves). The control group was not treated. the study was repeated in the following year. Across both years of the study, parasite egg counts were substantially reduced in both the treated cows (P