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Reduced fecundity of Psoroptes ovis (Hering) (Acari: Psoroptidae) on calves treated with ivermectin*

Published online by Cambridge University Press:  10 July 2009

Frank S. Guillot  and
Fred C. Wright
Frank S. Guillot
Affiliation:
U.S. Livestock insects Laboratory, U.S. Department of Agriculture, Agricultural Research Service, Kerrville, Texas 78028, USA
Fred C. Wright
Affiliation:
U.S. Livestock insects Laboratory, U.S. Department of Agriculture, Agricultural Research Service, Kerrville, Texas 78028, USA
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Abstract

Ivermectin injected subcutaneously into calves at the rate of 200 μ/kg body weight completely eliminated females of Psoroptes ovis (Her.) in 22 days. Injection of ivermectin also adversely affected the number and hatch of eggs and the proportion of adult males forming attachment pairs. The reduced number of eggs recovered in skin scrapings was apparently the result of a significantly lower fecundity among females that temporarily survived on treated calves. Females that were exposed to ivermectin for only three days did not recover their full reproductive potential even though they were transferred to calves not injected with ivermectin. The proportion of ovigerous females among survivors was not significantly affected five days after injection. Since the number of eggs recovered in skin scrapings was substantially reduced after only three days, the effect of ivermectin on female fecundity was not primarily gonadal. Reduction in the number of P. ovis eggs three days after treatment probably occurred because of a combination of mortality of adult females and reduced oviposition by ovigerous females surviving in the population.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 74 , Issue 4 , December 1984 , pp. 657 - 662
Copyright
Copyright © Cambridge University Press 1984

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