Parasitology of sucking beef calves treated with macrocylic lactone anthelmintics in either an extended-release injectable formulation or a pour-on formulation

Authors

  • W. D. Whittier Production Management Medicine, VA-MD Reg. College Vet. Med., VA Tech, Blacksburg, VA 24061
  • J. F. Currin Production Management Medicine, VA-MD Reg. College Vet. Med., VA Tech, Blacksburg, VA 24061
  • S. Holland Production Management Medicine, VA-MD Reg. College Vet. Med., VA Tech, Blacksburg, VA 24061
  • A. M. Zajac Production Management Medicine, VA-MD Reg. College Vet. Med., VA Tech, Blacksburg, VA 24061
  • R. Kasimanickam Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, WA 99164

DOI:

https://doi.org/10.21423/aabppro20153618

Keywords:

parasiticide, extended-release, beef calves, eprinomectin, parasite, pour-on ivermectin, Cooperia oncophora, Ostertagia ostertagi, Cooperia punctata

Abstract

The objective of this trial was to test the hypothesis that treating suckling beef calves grazing summer pastures with an extended-release injectable parasiticide containing eprinomectin (ERE) would result in changes in GI parasite loads when compared to a pour-on ivermectin (P0I) formulation. ERE contains the anthelmintic with poly(lactic-co-glycolic acid) (PLGA) polymer allowing slow release of eprinomectiin following injection with a label claim for protection against reinfection with Cooperia oncophora and punctata for 100 d and Ostertagia ostertagi for 120 d. POI claims 21 d control for Cooperia punctata with 14 for Ostertagia ostertagi and Cooperia oncophora.

Cover image of the 48th Conference Proceedings: An image of Dr. Fred Gingrich II dressed in a red shirt and overalls and standing in front of dairy cows in a barn interior. Yellow background.

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Published

2015-09-17

Issue

2015

Section

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