The relationship between degree of Mycoplasma hyosynoviae infection and front leg soundness in Duroc swine was examined in three lines of pigs (structurally sound, control and unsound) from a population divergently selected for front leg soundness. Analysis of sera collected between 6 and 26 weeks of age yielded complement-fixing antibody titers which were interpreted as being indicative of the degree of infection with M. hyosynoviae. Statistical analysis of several variables defined using titer levels failed to reveal significant differences between the three selected lines but trends indicated higher titer values for those pigs from the unsound line. Heritability estimates for the defined titer variables ranged from .28 + .25 to .51 + .28.

L. S Lawrisuk, R. F Ross, Max F Rothschild, L. L Christian, D. L Meeker

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 665–670, 1986
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