The paper emphasizes the main research results obtained in last 15 Years concerning official control (O.C.P.) of cattle production by breeds, from county of Mures. This-makes possible the characterization of main reproduction and production traits of 2844 Romanian Spotted cows in dynamics, by 10 lactations and by all effective, function of propriety. These results emphasize valuable traits for milk production in studied cattle population, which differ function of origin, meaning the most valuable biological material was obtained in A.S.A.S sector, followed by private farms and commercial societies with prioritary state capital, respectively.