An ovine major histocompatibility complex DRBI allele is associated with low faecal egg counts following natural, predominantly Ostertagia circumcincta infection

Abstract

Infection with Ostertagia circumcincta is a major constraint on sheep production in temperate areas of the world. A potential control strategy is the use of genetically resistant sheep. Therefore we examined the association between MHC-DRB1 alleles and faecal egg counts following natural, predominately O. circumcincta infection in a flock of Scottish Blackface sheep. Nineteen DRB1 alleles were identified by a combination of variation in the length of simple repetitive sequences within the intron between exons 2 and 3 and hybridisation of selected oligonucleotides to polymorphisms within exon 2. Faecal samples were taken from 200 lambs from one to six months of age at intervals of 4 weeks. Genetic effects were strongest at 6 months of age. Least-squares analysis indicated that substitution of the most common allele (I) by allele G2 would result in a 58-fold reduction in faecal egg counts in 6-month-old lambs and a 22-fold reduction in 5-month-old lambs. These results suggest that the major histocompatibility complex plays an important role in the development of resistance to O. circumcincta.

Citation

Schwaiger, F.W.; Gostomski, D.; Stear, M.J.; Duncan, J.L.; McKellar, Q.A.; Epplen, J.T.; Buitkamp, J. An ovine Major histocompatibility complex DRB1 allele is associated with low faecal egg counts following natural, predominantly Ostertagia circumcincta infection. International Journal for Parasitology (1995) 25 (7) 815-822. [DOI: 10.1016/0020-7519(94)00216-B]

An ovine major histocompatibility complex DRBI allele is associated with low faecal egg counts following natural, predominantly Ostertagia circumcincta infection

Help us improve GOV.UK

Don’t include personal or financial information like your National Insurance number or credit card details.