Abstract
Abstract An on-farm study was undertaken, firstly, to compare the Duroc and Hampshire as terminal sires in a three-way cross including the Landrace and Large White breeds and, secondly, to evaluate the latter cross against a two-way backcross involving the White breeds. Three boars of each sire breed were mated with crossbred sows of Large White, Landrace breeding and the progeny were grown to 85 kg liveweight on ad libitum feeding. Duroc- and Hampshire-sired litters had relatively fewer still births but breed of sire did not influence the number of live births in the litter or litter size at weaning. Duroc and Hampshire-crosses reached slaughter weight 4 days earlier than the Large White- and Landrace-crosses. They also had similar killing-out percentages and back fat measurements and these were higher and lower respectively than the crosses of the White breeds. Hampshire crosses had the largest eye muscles in cross-sectional area. Tissue composition of the carcass was not significantly different in Duro...
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