Using EBVs to Reduce Parasitism

Genetic selection for internal parasite resistance in sheep is a valuable tool to mitigate effects of parasitism, especially when significant within breed variation exists. Towards this objective, West Virginia University (WVU) and Virginia Tech researchers devised a divergent mating scheme using Katahdin rams selected for high or low estimated breeding values (EBVs) for fecal egg count (FEC). High FEC EBV (n=2) and low FEC EBV (n=2) rams were randomly mated to Katahdin ewes at Virginia Tech's Southwest Virginia Agriculture Research & Extension Center. Lambs were born in mid-March and weaned in mid-June. They were exposed to parasites during the pre-weaning phase. After weaning, the lambs we

Brazilians Evaluate TST Alternatives

Brazilian researchers designed a study to evaluate the effectiveness of both productive and clinical indicators in the targeted selective treatment (TST) of gastrointestinal parasites in growing lambs. Two experiments were carried out between 2015 and 2016. In the first experiment, lambs (n=70) were raised exclusively on pasture and evaluated from 60 to 180 days of age. In the second experiment, lambs (n=48) were raised on pasture and fed a commercial supplement. They were evaluated from 60 to 150 days of age. Parasitological, productive, and clinical parameters were measured every 14 days. Lambs were divided into four experimental groups, based on different criterion for anthelmintic treatm

Worms in German Lambs

Researchers determined the prevalence and variation of natural gastrointestinal nematode (GIN) infections in lambs according to birth type, gender, and breed based on individual fecal egg counts (FEC) from various regions in Germany. A total of 3,924 lambs (3-15 months old) with different genetic backgrounds (Merinoland, German Blackhead Mutton, Rhoen, Texel, and Merino long-wool) were individually sampled during the grazing period between 2006 and 2008. Sixty-three percent of the lambs were infected with GIN. The infection level of GIN based on FEC was low to moderate and involved multi-species infections. Trichostrongylus spp. (52.8%), H. contortus (32.9%), and Teladorsagia spp. (14%) were

Understanding Nematophagous Fungi

Nematophagous fungi are carnivorous fungi specialized in trapping and digesting nematodes. Around 160 species are known. There exist both species that live inside the nematodes from the beginning and others that catch them, mostly with glue traps or in rings, some of which constrict on contact. [Wikipedia] by Ray Kaplan Soil biota is an incredibly competitive environment with free-living nematodes, virus, bacteria, fungi, insects, protozoans, etc. Adding more of one does not permanently change the balance, as the competitive environment returns rapidly to a steady state. Duddingtonia flagrans is just one of hundreds of species of nematophagous fungi that exist in the soil, and these fungi u

Birdsfoot Trefoil for Parasite Control

High-tannin forages can be used to help mitigate the serious limitations associated with gastrointestinal nematode (GIN) infections on efficient small ruminant production. Research conducted at West Virginia University showed that grazing a high-tannin cultivar of birdsfoot trefoil (Lotus corniculatus L.) had both therapeutic and preventative effects on Haemonchus contortus infections in lambs and could be used in a systems approach to control GIN parasites in grazing sheep. Source: Journal of Animal Science, January 2019 Read article in Feedstuffs magazine

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