Gîlcă, IoanGîlcă, ValericaMihalache, Roxana-GeorgianaAvram, P.Proboteanu, A.Gîngă, C.Ignat, Elena2026-10-272026-10-272018https://repository.iuls.ro/handle/20.500.12811/7165Researches were done in a population of 300 cows Black and White breed grow into the private exploitation in the North East part of Romania. There were analyzed the following characters: the age of the first calving(V.P.); the calving-interval (C.I.); the inter-lactation period (R.M.); service period (S.P.). The mean values of breeding indices (VP, RM, CI and SP) highlight an inappropriate state of reproductive activity, with large differences from one holding to another and even within the same holding.enCC BY-NC-SA 4.0https://creativecommons.org/licenses/by-nc-sa/4.0/cowsBlack and White breedreproduction indicesprivate farmsArticle2821 - 6644