Analysis of the data from 7,750 boars of Durocs, Landraces and Yorkshires performance tested at the Korea Swine Testing Station from 1985 to 1993 showed the significant main effects of breed, test diet, year of test and months of test for all three traits studied, average daily gain, feed efficiency and backfat thickness. The effect of the difference in initial weights was significant for average daily gain and feed efficiency The effects of the interaction of breed with other factors were also estimated. Yearly reduction in backfat thickness over the nine year period was .029, .077 and .079 cm for Durocs, Landraces and Yorkshires. Feed efficiency was also improved significantly during the period in all three breeds. 

Y. I Park, K. S Seo, H. C Park, H. W Chung

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 429–431, 1994
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