Data from 5,062 boars performance tested at the Korea Swine Testing Station from March, 1984 to November, 1989 were analysed by least squares method to evaluate the performance and the time trend in performance of Durocs, Hamp- shires, Landraces and Yorkshires. Durocs had a higher average daily gain than other breeds, Yorkshires and Durocs had a lower final age and were more efficient than other breeds. Durocs had the most thickness of backfat. The final age decreased significantly in Durocs during the 6-year period. The yearly decline in backfat thickness was .010, .009, .081 and .069 cm for Durocs, Hamp- shires, Landraces and Yorkshires, respectively. Regressions of feed efficiency on year of test were statistically insignificant in all four breeds, and the regressions of average daily gain on year of test were inconsistent among the breeds.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 443–445, 1990
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