By Dimitrov, M. and Gergovska, Z. and Mitev, J. and Petkov, P. and Sabev, S. and Todorov, N., Bulgarian Journal of Veterinary Medicine, 2000
Description
761 calvings have been included in the study; 159 of which were from Bulgarian Black and White cows and 566 from Bulgarian Brown multiparous cows. Cows were reared on one farm, tethered and milked twice daily. The factors that influenced the occurrence of calving difficulties, metritis, postparturient paresis, ketosis and laminitis as well as the interrelationship among them and their influence on the average daily milk yield during the first month of lactation have been studied. The obesity of cows with body condition score (BCS) >4 points prepartum resulted in higher live weight of newborn calves and a significantly increased risk of difficult calving. The latter could result in risk of retained placenta. The principal causes of postparturient endometritis were the problems at calving, the retained placenta and ketosis. The risk of postparturient ketosis increased in obese cows with BCS >4 points. The low, as well as the high BCS before calving increased the risk of postparturient paresis in cows. The diseases related to metabolic disorders, ketosis and postparturient paresis, increased the risk of laminitis after calving. Calving difficulties and early endometritis had no significant influence on the average daily milk yield during the first month of lactation. Metabolic disorders and laminitis caused a considerable decrease in the average daily milk yield of cows during the first month of lactation
761 calvings have been included in the study; 159 of which were from Bulgarian Black and White cows and 566 from Bulgarian Brown multiparous cows. Cows were reared on one farm, tethered and milked twice daily. The factors that influenced the occurrence of calving difficulties, metritis, postparturient paresis, ketosis and laminitis as well as the interrelationship among them and their influence on the average daily milk yield during the first month of lactation have been studied. The obesity of cows with body condition score (BCS) >4 points prepartum resulted in higher live weight of newborn calves and a significantly increased risk of difficult calving. The latter could result in risk of retained placenta. The principal causes of postparturient endometritis were the problems at calving, the retained placenta and ketosis. The risk of postparturient ketosis increased in obese cows with BCS >4 points. The low, as well as the high BCS before calving increased the risk of postparturient paresis in cows. The diseases related to metabolic disorders, ketosis and postparturient paresis, increased the risk of laminitis after calving. Calving difficulties and early endometritis had no significant influence on the average daily milk yield during the first month of lactation. Metabolic disorders and laminitis caused a considerable decrease in the average daily milk yield of cows during the first month of lactation
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