Abstract
Eprinomectin is recommended for use as an anti-parasitic agent in livestock, including cattle. Yaks are a member of the cattle family living in the high altitude mountains of China and adjacent countries; however, there have been no clinical trials of the anthelmintic efficacy and pharmacokinetics of eprinomectin in yaks. The purpose of this study was to investigate the endectocidal efficacy and pharmacokinetics of eprinomectin following topical (at 0.5 mg/kg) and subcutaneous (at 0.2 mg/kg) administration in the yak. After topical administration, plasma eprinomectin reached a peak value of 15.31 ± 3.71 ng/ml (Cmax) at 3.01 ± 1.22 days (Tmax). In milk, the Cmax was 3.74 ± 1.05 ng/ml at 3.00 ± 0.88 days. The AUC0-t for plasma was 193.84 ± 26.34 ng d/ml and for milk AUC(0-t) was 46.24 ± 10.37 ng d/ml. The mean residence time (MRT) was 10.74 ± 1.44 days and 10.90 ± 3.87 days in plasma and milk, respectively. After subcutaneous administration, the Cmax was 35.78 ± 10.53 ng/ml at 0.91 ± 0.39 days in plasma and 9.10 ± 3.61 ng/ml at 1.61 ± 1.05 days in milk. The MRTs in plasma and milk were 3.07 ± 1.50 and 3.64 ± 1.15 days, respectively. The AUC(0-t) was 133.71 ± 32.51 ng d/ml for plasma and 43.85 ± 14.16 ng d/ml for milk. Both the po...Continue Reading
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