Analysis of Reproductive Indicators in Holstein Dairy Cows in Correlation with Management Factors

Managing reproductive activity in dairy farms is an important factor in increasing cow productivity and making the farm more economically efficient. The research was carried out in the 5 most important Holstein dairy farms in Romania, during the period 2022-2024. The data obtained were processed and interpreted statistically, compared with the results obtained for these parameters by other researchers. Following the research, average values ​​of milk quantity were recorded ranging from 9749.38 ± 20.88 kg of milk in farm D in 2022 and 15514.01 ± 29.31 kg of milk in farm A in 2024. The age of first calving decreased from one year to the latest in each farm, with the averages falling in the last year between 22.53 months and 24.61 months, and the calving interval decreased with an average value on all farms in 2024 of 401 days. The average duration of exploitation of dairy cows is 4 lactations, and based on the calculation of the efficiency index of reproductive activity, the 5 farms are efficient in terms of using cows for reproduction.