Differences between Nn and NN were estimated within litters by HAL-1843 typing 905 pigs from three sire lines : one pure, one synthetic, and one F, cross. Pigs were fed ad libitum either w et or dry from 45 to 95 kg liveweight on three farms. Compared to NN over lines, only one out of four backfat depths (K) was conclusively reduced in Nn (-0 .5 5 s.e. 0.24 mm). There were nonsignificant indications that while Nn backfat was reduced in the pure line, it was increased in the cross. There were no conclusive effects of Nn on growth rate, but evidence of a small reduction in the cross ( - 3 5 s.e. 19 g/day). Judged solely from these traits, and w ithout direct measures of lean yield, the commercial advantage of Nn over NN would be very small and would not justify its longterm retention.

A. J Webb, B. Grundy, P. Kitchin

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 421–424, 1994
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