THE EFFECT OF CROSSBREEDING ROMANIAN SPOTTED WITH SEVERAL BREEDS IN S.C. AGRICOLA S.A. FARM FROM SATU MARE COUNTY

The researches refer to the bulls effects of breed Simmental utilization for crossbreed with cows of breed Romanian Yellow Spotted on main indexes for the milk productions: age of the first fertile insemination, the age of the first calving, the period (length) of the normal lactation and total lactation, fat and protein percent, length mammal repose and calving period. Analyses comparative for normal and total lactations between Romanian Spotted pure breed and several crossbreed disclosure an supplementary of milk production just for crossbreeds BRxBG* by 12, 57%, and for the others resulted a decrease with 2,76% for BRxSIM* and 16,62% for BRxBA*. Same analyses but comparative on first lactation disclosure difference significantly, thus crossbreeds BRxBG achieves an addition of 819 kg milk, 18%, BRxSIM- crossbreed achieves a decrease with 598 kg milk respectively 13,14% and BRxBA crossbreed achieves a decrease with 351 kg milk, 7,71%. The differences for milk production level from lactations 2-4 has reduced significantly with tendency to equalization between cow milk by Romanian Spotted breed and crossbreed groups.