Abstract

A genetic evaluation program was developed which provides best linear unbiased predictions of breeding values of s ir e s and dams of tested pigs and genetic trends in the tested population for backfat and growth rate. For pigs born between July, 1982 and December, 1984, annual genetic trends in backfat ranged from -.08 to -.19 iwi/yr in the white breeds (Yorkshire, Landrace, Lacombe) and were .03 mm/yr in the coloured breeds (Duroc, Hampshire). Genetic trends for days to 90 kg ranged from -.2 d/yr in Durocs to -1.7 d/yr in Lacombes. Average selection d if fe re n t ia ls for backfat among parents born between 1977 and 1983 ranged from -.19 (Hampshires) to -.64 (Lacombes) mm in g i l t s and -.10 (station tested Hampshires) to -1.06 (station tested Y orkshires) mm in boars. For days to 90 kg, selection d if f e r e n t ia ls ranged from -1.7 (Durocs) to -7.2 (Lacombes) d in g i l t s and -4.9 (home tested Hampshires) to -11.1 (home tested Lacombes) d in boars. Trends in selection d if f e r e n t ia ls indicated increased emphasis on growth rate and decreased emphasis on leanness over time.
 

B. W Kennedy, G. FS Hudson, Larry R Schaeffer

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume X. Breeding programs for swine, poultry, and fish., , 149–154, 1986
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