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Genetic factors influencing atrophic rhinitis in the pig

Published online by Cambridge University Press:  02 September 2010

B. W. Kennedy  and
J. E. Moxley
B. W. Kennedy
Affiliation:
Macdonald College of McGill University, Ste-Anne de Bellevue, Quebec H9X 1CO, Canada
J. E. Moxley
Affiliation:
Macdonald College of McGill University, Ste-Anne de Bellevue, Quebec H9X 1CO, Canada
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Abstract

Data from 1447 pigs from 438 litters were used to estimate heritability, breeding and mating system differences and heterosis of atrophic rhinitis. Yorkshire, Landrace and Lacombe breeds and their crosses were represented. Rhinitis was measured by necropsic examination of the degree of degeneration of the nasal turbinates. Two traits were considered: rhinitis incidence, based on whether or not pigs showed any nasal turbinate degeneration; and rhinitis score, which ranged from zero to four, based on the percentage of nasal turbinate degeneration exhibited. Heritabilities of rhinitis incidence and score were 0·12±0·09 and 0·03±0·02, respectively. Mating system differences were significant but differences between crosses within mating system were not. Estimates of heterosis of two-breed, backcross and three-breed cross pigs over purebreds were respectively, 1·1, 3·4 and 22·1% for rhinitis incidence and 10·1, 13·2 and 28·5% for rhinitis score.

Type
Research Article
Information
Animal Production , Volume 30 , Issue 2 , April 1980 , pp. 277 - 283
Copyright
Copyright © British Society of Animal Science 1980

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