UTICAJ ODGAJIVAČKOG PODRUČJA, GODINE ROĐENJA I SEZONE TELENJA NA PROIZVODNJU MLEKA I MLEČNE MASATI U STANDARDNIM LAKTACIJAMA KOD KRAVA SIMENTALSKE RASE

The analysis of impact that breeding area, year of birth, calving season and interaction between breeding area and calving season have on milk and milk fat production in full lactations was performed in 241 Simmental cows, with 897 lactations born in period from 1998 to 2007 and distributed into three breeding areas (Čačak, Zlatibor and Rudno). According to applied model, analysis of the influence of paragenetic factors, imapct of breeding area and interaction of breeding area and calving season on the production of milk and milk fat in full lactation was very significant (P 0.05) the production of milk and milk fat, while the calving season significantly impacted (P 0.05) the production of milk fat in full lactation. Coefficients of determination were very significant (P<0.01) and ranged from 0.431 (43.1%) in milk fat production to 0.500 (50%) in milk production.