410 litters of both pure and crossbred progenies of the Nigerian Indigenous and the exotic pigs (Hampshire and Large White) were evaluated on their crossbreeding potentials in the development of commercial hybrid for 1he small-holder rural farmer. Significant breed of sire difference was observed for almost all traits (PC 0.05) with 6.5% more pigs sired by LargeWhite boars and 1.33 days shorter gestation length in the indigenous-sired litters. 16-25% heterosis was recorded for the growth potential of the Fj and crosses together with reduced preweaning mortality of 12-18% as against 18-38% in the purebred exotic litters. Significant reduction in age at 50kg was also observed ranging from 156-161 days in the crosses compared to 174 days in the purebred indigenous though hitler than 146-149 days of the exotics. Similar ratios were recorded in the killout percentage, carcass length. the back fat thickness and the carcass lean percent With the distinct colour patterns reflected in the F2 and F3 especially in the Hampshire crosses it became apparently feasible that the Nigerian indigenous pigs could be utilized in crossbreeding programmes for the production of specific hybrids for the sin ail-holder rural farmer.

Ayotunde O Adebambo

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume X. Breeding programs for swine, poultry, and fish., , 70–74, 1986
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