Vashchenko A. Efficiency pigs use of foreign selection in crossing with domestic breeds and types

The paper identifies the effectiveness of using inter-breeding pigs for competitive high quality pork. It is recommended at the initial stage to cross the moths of Ukrainian large white breed with breed’s landraces of English breeding, which will allow them to get a maternal form with a strong constitution and good reproductive qualities. The expediency of using the pietrain and red white belt breeds of pigs at the final cross-breeding stage has been proved to produce breeding grounds with good reproductive, fattening and meat qualities. The further use of specialized breeds for breeding did not worsen the reproductive qualities of two-breed uterus. When fattening young pigs up to 100 kg of live weight, the three-generation breeding grounds (1/4LW + 1/4L + 1/2DUSS) and (1/4ULW-1 + 1/4L + 1/2P) had the highest growth energy. The term fattening of domestic animals of these genotypes, as compared with control, decreased by 10.9-23.1 days at feed costs from 3.59 to 3.33 feed units per kilogram of gain. Bacon pork was obtained from three-breed matings, using, at the final stage of industrial cross-breeding, the Pietrain breeds (1/4ULW-1 + 1/4L + 1/2P; 1/4LW + 1/4L + 1/2P) and red white belt (1/4ULW-1 + 1/4L + 1/2RWB). Meat pork was obtained from the pigs when crossing two breeds-uterus (1/2ULW-1 + 1/2L) and (1/2LW+ 1/2L) from boar Duroc Ukrainian selection "Stepnoy" (DUSS). The use of landrace and red-white belt breeds during cross breeding contributed to a decrease in the share of stress-sensitive animals (up to 4.3-4.9% of the total population). Stress-resistant animals had a higher growth rate: live weight of 100 kg from them was obtained at the age of 165.8±1.86 days (P> 0.999), which is 11.3 days faster than the young pigs, which was identified as stress-sensitive. The shortening of the period for the cultivation of domestic animals by 6.8-13.5 days made it possible to increase the profitability in these groups to 17.0-18.6%. Recommended breeding genotypes (1/4ULW-1 + 1/4L + 1/2P) of which received carcass weight varying conditions without significant additional costs and reducing profitability.