RESEARCH FOR IMPROVING BEEF PRODUCTION USING THE COMMERCIAL CROSSBREEDING WITH SPECIALIZED BREEDS

V. Ujică, V. Maciuc, I. Nistor, C. Viziteu, C.E. Nistor, E.C. Popescu

Abstract
In the aim of knowing the influence of beef breeds, in crossbreeding with domestic breeds, Black and White Romanian and Romanian Spotted, for beef production improving we conducted two experiences, a crossbreeding with Blank Belgian Blue on one hand and Limousine and Charolaise on the other hand, the obtained half-breeds being capitalized for beef. The objectives followed by the experimental protocol were: insemination of domestic breeds with semen from beef breeds and follow of reproduction indices (insemination number, gestation days, calf sex and parturition kind, the percent of non-return at 56 days, percent of abortion etc.); observation of half-breeds calf growing process until 18 months by: body weight determination, growing indices of main corporal measurement, total gain and average daily gain for age stages, calf slaughter and follow the qualitative and quantitative beef indices, including chemical analyses and histological determination for beef. The results shown that commercial crossbreeding has beneficial effects, the most favourable ones were crossbreeding of BBB breed with Romanian Spotted cows and by using Limousine and Charolaise breeds.

Key words: beef production, commercial crossbreeding, reproduction indices