Buletin USAMV-CN, 62/2006 (71-74) ISSN 1454-2382 CHARACTERIZATION OF THE MILK PRODUCTION TRAITS IN COWS INCLUDED IN OFFICIAL CONTROL OF PRODUCTION (OCP) IN 4 COUNTIES FROM TRANSYLVANIA Onaciu G. University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Faculty of Animal Husbandry and Biotechnology, Mănătur St., no. 3 - 5, 400372 Cluj – Napoca, Romania gregon@email.ro Key words: cattle, breeds, traits, milk, production Abstract. According to the national programme of cattle breeding and repartition by areas BălŃată Românească breed is predominant in Transylvania together with BălŃată cu Negru Românească and Bruna de Maramure breeds, which together with their crossing products are important deliverers of milk and beef production within studied area. In this context, the comparative emphasizing of the main morpho- productive traits of these breeds exploited for milk production in four representative counties concerning agricultural production, animal production especially is the aim of his paper. The research was performed during 1990-2005 in 4 counties from the Transylvanian area, (AB,CJ,CV,MS), based on the data obtained from the official control of productions (OCP). The research included a number of 16.151 dairy cows, which recorded a total number of 70.538 lactations, of which BălŃată românească with 11.852 heads with 56.305 lactations, 4.225 heads of BălŃată cu Negru românească with 13.912 lactations and 74 heads of Brună de Maramure which recorded 321 lactations. MATERIAL AND METHOD The research was performed on the biological material made up of cattle, dairy cows included in OCP for 15 years. They were reared, controlled and exploited for milk production in counties of Alba, Cluj, Covasna and Mure. We considered these counties representative for the Transylvanian area. We analyzed the total effective of 16.151 dairy cows, which realized 70.538 lactations, in order to perform this objective. The main reproduction and production indices were determined for the traits mentioned in tables 1, 2 and 3. The production and reproduction data were obtained by the official control of milk production. The databases from the UARZ unities (origin, reproduction and production) from the aimed counties were collected, processed and statistically interpreted. RESULTS AND DISCUSSIONS