Across-herd Expected Progeny Differences for Yorkshire pigs bom since 1982 were analyzed to
 determine die amount of genetic trend which has taken place in the breed. Five traits and three indexes were examined. Four traits and all indexes have shown a trend in the desired direction since 1987-1988; at that time, genetic evaluations were first calculated using animal model technology and used by a substantial number of breeders. Means for animals which became parents have been consistently superior to nonparent means. The fifth trait, which is not reported to breeders, has shown no change. The improvement in
 performance reflected by the maternal line index is worth more than $10 for each litter produced by a
 daughter of a Yorkshire animal, relative to the beginning of the program.

D. L Lofgren, D. L Harris, T. S Stewart, D. D Anderson, A. P Schinckel, M. E Einstein

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 425–428, 1994
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