J. Anim Sci.
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J. Anim Sci. 2008. 86:1765-1769. doi:10.2527/jas.2007-0628
© 2008 American Society of Animal Science
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ANIMAL GENETICS

Estimates of genetic parameters for kyphosis in two crossbred swine populations1,2

J. W. Holl3, G. A. Rohrer, S. D. Shackelford, T. L. Wheeler and M. Koohmaraie

US Meat Animal Research Center, USDA, ARS, Clay Center, NE 68933

3 Corresponding author: Justin.Holl{at}ars.usda.gov

Genetic parameters for degree of kyphosis were estimated from a Duroc-Landrace F2 population (n = 316) and from a composite population (line C) composed of Duroc, Large White, and 2 sources of Landrace (n = 1,552). Live presentation did not indicate kyphosis in pigs or sows. Degree of kyphosis was measured by scoring the shape of the vertebral column of split carcasses on a scale from 0 (normal) to 3 (severe). Of the animals slaughtered, 75.6 and 68.9% were normal, 11.1 and 23.3% were mild, 11.1 and 6.2% were moderate, and 2.2 and 1.5% were severe in F2 and line C, respectively. Fixed effects of age, sex, number of ribs, number of lumbar vertebrae, number of nipples, carcass length, and HCW were not significantly associated (P > 0.10) with kyphosis score when using linear models. Estimated heritabilities for kyphosis score were 0.30 and 0.32 in F2 and line C, respectively, when using an animal model. Estimated genetic correlations between kyphosis score and number of ribs, number of lumbar vertebrae, number of nipples, carcass length, and HCW were 0.05, –0.13, 0.00, 0.05, and 0.03, respectively. Selection to decrease kyphosis should be effective and would not be expected to affect the number of ribs, lumbar vertebrae, nipples, or carcass length. In addition, selection for growth should not affect the incidence of kyphosis.

Key Words: heritability • kyphosis • pig






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