Efficacy and production benefits following use of eprinomectin extended-release injection in pastured dairy heifers

摘要: A study was conducted in grazing dairy heifers to assess anthelmintic efficacy and production responses treated with a single injection of eprinomectin an extended-release formulation over 123 day-period. The on pasture-based the Southeastern United States (North Carolina) summer months. Sixty crossbred were weighed randomly allocated into 2 groups. One group (n = 30) given 5% subcutaneously cervical region while other equivalent volume saline. Calves every 30 days throughout trial for calculation average daily gain differences overall weight gain. In addition, fecal samples collected at 0, 30, 60, 90 worm egg count coproculture. Both groups cattle had similar concentrations start study. However, control increasing eggs months that received minimal eggs. primary parasite species identified this Haemonchus placei, Cooperia Ostertagia. gained 105 + 2.8 kg during 123-day period, representing 0.85 kg/day compared 78.3 4.1 (0.64 kg/day) group. This represented 33 % increase associated deworming. results indicate dose sufficient parasites through season administration significant impact