USING OF FOREIGN SELECTION BOARS FOR OBTAINING OF HYBRIDS

It was determined that crossing of crossbred sows of LW×Y and L×LW with hybrid boars of L×D has a positive effect on increase in multiple pregnancy, milkiness and number of piglets at weaning by 3.5-4.4 %, 4.5-5.8 and 3.7-6.5 % in comparison with the best two-breed variant LW×L. Use of boars of Duroc breed as paternal form with crossbred sows of LW×BM and BM×L has negative effect on reproductive traits of sows, showing reduction of multiple pregnancy (by 10.8 %), milkiness (by 2.6-4.2 %), number of piglets (by 14.7-16.3 %) and weight of litter to weaning (by 19.4-21.5 %), compared to sows of same origin with boars of Landrace breed. It was revealed that resulting from crossing of crossbred sows of LW×Y and L×LW with hybrid boars of L×D final hybrids considerably surpass on fattening traits (on the age of reaching weight of 100 kg - by 8.5-9.4%, on average weight gain - by 12.0-13.1%, feed cost per 1 kg of weight gain decrease by 4,7-6,2%) the best the best two-breed variant LW×L. Good feeding traits were shown by three-breed hybrids as well (BM×L)×D and (BM×L)×L with the average daily weight gain at the level of 801-803 g at feed cost of 3.38-3.40 kg per 1 kg of gain.

breed, Belarusian meat breed, Landrace, Yorkshire, Landrace, Duroc, fattening and meat traits, heterosis

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