Three generations of selection for increased weight at 200 days of age were practiced in Landrace pigs. Weights and ultrasonic baekfat thickness at 200 days of age were collected on 539 pigs. The objective each generation was to have the select line sired by nine boars and out of 18 sows which had the heaviest weights at 200 days of age. The control line was to be sired by five boars and out of 10 sows randomly selected within pedigree. The traits evaluated were 200 day weight, days required to reach 100 kg, ultrasonic baekfat thickness at 200 days and adjusted to 100 kg. Responses to selection were estimated by regressing generation means adjusted for environmental generation effects on generation number. The realized heritability of 200 day weight was calculated by regressing response on weighted cumulative selection differential and was .22±.09. Weight at 200 days increased by 3.7+1.5 kg/generation. Correlated responses in days to 100 kg, baekfat thickness at 200 days and at 100 kg were -6.7±.4 days/generation, .048±.039 and -.015+.033 em/generation, respectively.

D. L Kuhlers, S. B Jungst

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 407–412, 1986
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