We’re mainly concerned with
parasitism in the younger animal
because that’s where we see most of the production loss.
TSCRA_BW_1.3Page.pdf 1 15/05/2013 1:40:11 PM
fore and after deworming they can see if their anthelmintic (dewormer) is working. In conjunction with a number of parasitologists, Merck Animal Health developed a stan- dardized fecal egg count reduction test. The test should be conducted on 20 animals randomly selected from a defi ned group. Twenty ani- mals, says Newcomb, “gives us a statistical look at what’s going on in the herd and overcomes the day- to-day variation in egg shedding.” For best results, sample animals
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from the same age group — ideally, cattle from 6 months to 2 years of age. For cow-calf operators, the fi eld test should be conducted dur- ing optimal parasite transmission conditions on your pasture. Stocker cattle, feedlot cattle and replace- ment heifers should be tested and treated upon arrival, and stockers and replacement heifers should be tested again after at least 2 months on permanent pasture. The second test to gauge effi cacy
should be conducted 14 days after the fi rst. According to Newcomb, “14 days is the magic number, be- cause that gives all the dewormers the chance to kill all the worms that they can. Yet, you should be under a time period before any re- infestation and new egg production can be going on.” If egg counts are not reduced by
48 The Cattleman June 2014
thecattlemanmagazine.com
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