The effects of dystocia and stillbirth on subsequent lactation performance in holstein dairy cows [Siyah Alaca Ineklerde Güç ve Ölü Do?umun Takip Eden Laktasyon Performansina Etkisi]
In this study, we aimed to evaluate the effects of difficult birth and stillbirth on following lactation performance in Holstein cows. For this purpose, were used the birth and milk production data of 591 births of 326 Holstein cows in 2005-2006 in a cattle farm in Kelkit, Gümüşhane. In study, in addition to the effects of difficult birth and stillbirth, the effects of other parameters such as calving year, calving season, birth sequence and birth type on 305 days milk performance and the number of milking days were also investigated. Difficult birth and stillbirth rate were 8.7% and 9.1% in Holstein cows, respectively. 305 days milk performance (608.6 kg) and the number milking days (23.1 days) of cows with difficult birth were significantly lower than those of cows with normal birth. 305 days milk performance and the number milking days of cows with stillbirth were 925.7 kg and 26.5 days, respectively, less than those of cows giving live birth (P<0.01). In conclusion, difficult birth and stillbirth, which are significant causes of economic losses including primarily milk and calf losses, constitutes some threat to animal welfare. These effects can be minimized with an effective herd management.