Purebred Yorkshire, Large White and their reciprocal crosses were evaluated for growth and carcass traits. A portion of each set of females was retained and mated to Duroc sires to produce 205 litters for evaluation and estimation of maternal heterosis. Of the four genotypes purebred Large White gilts had the fastest daily gain (P<.05), the least backfat (P<.05), the greatest loin depth (P c.05) and the highest percentage lean cuts (P c.05). The difference between purebred average and crossbred average for growth and carcass traits was not significant. Crossbred average exceeded purebred average for average pig birth weight (P c.05). Maternal heterosis for average pig birth weight was 6.18%. Average pig birth weight was heaviest for pigs produced by Yorkshire-Large White dams (P c.05). Other litter traits were not significantly different between breeds or breed crosses.

S. M Neal, K. M Irvin

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 436–438, 1994
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