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A new fact sheet has been published in the Best Management Practices to Control Internal Parasites in Small Ruminants series. It is entitled "Worm-Killing Fungus"." It was written by Drs. Jim Miller and Joan Burke, Louisiana State University and USDA ARS, respectively.
There are two ways to get dewormer-resistant worms: breed your own or import them from someone else's farm. Sheep and goat farms in the US without dewormer-resistant worms are rare. Assume that any sheep or goat brought to your farm is carrying worms with some degree of dewormer resistance.
Adriano Vatta joined the faculty of the School of Veterinary Medicine at Louisiana State University in December 2020. Just prior, he spent eight years at Zoetis where he focused on anti-parasitic drug research. For several years, Vatta taught veterinary parasitology to students at Ross University in St. Kitts, West Indies.
The periparturient egg rise is a well known phenomenon in small ruminants. It is the reduction in immunity to parasites that occurs around the time of birthing. The resulting high fecal egg counts are a primary source of pasture infectivity, especially for lambs/kids.
Since 2013, over 60 "Timely Topic" articles have been published to the web site of the American Consortium for Small Ruminant Parasite Control (ACSRPC; WormX). The articles are written by members of the consortium and cover various topics pertaining to internal parasite control in sheep, goats, and camelids. Some of the articles are available in PDF format.