Correa M T, Curtis C R, Erb H N, Scarlett J M, Smith R D
Department of Clinical Sciences, New York State College of Veterinary Medicine.
J Dairy Sci. 1990 Jun;73(6):1515-24. doi: 10.3168/jds.S0022-0302(90)78819-4.
Path analysis and multiple logistic-normal regression were used to model the interrelationships between stated herd management practices and herd 30-d postpartum incidence rates of dystocia, retained placenta, and clinical postpartum metritis, cystic ovary, milk fever, ketosis, left displaced abomasum, and mastitis. Management risk factors were obtained from a personal interview questionnaire. Data were from 2141 multiparous Holstein calvings from May 1981 through April 1982 in 32 commercial herds in the vicinity of Cornell University. Farms where the stated policy was to administer low calcium diets to the dry cows experienced more dystocia and retained placenta. More dystocia was experienced on farms where the stated policy was to administer extra vitamin D to dry cows, where dry cows were housed with the milking cows, or where calving occurred in maternity pens rather than stanchions. There was an increased likelihood of milk fever and left displaced abomasum on farms on which the stated policy was to lead feed. Farms where dairy farmers treated cases of retained placenta had more retained placenta than farms on which the treatment was done by the veterinarian. Farms reporting the practice of feeding the cows to increase their weight during the dry period had increased odds of ketosis.
采用路径分析和多元逻辑正态回归来建立既定牛群管理措施与牛群产后30天难产、胎衣不下、临床产后子宫内膜炎、卵巢囊肿、产乳热、酮病、真胃左方变位和乳腺炎发病率之间的相互关系模型。管理风险因素通过个人访谈问卷获得。数据来自1981年5月至1982年4月康奈尔大学附近32个商业牛群中2141头经产荷斯坦奶牛的产犊情况。规定对干奶牛采用低钙日粮的农场，难产和胎衣不下的情况更多。规定对干奶牛额外补充维生素D、将干奶牛与泌乳奶牛圈养在一起，或者在产房而不是牛栏中产犊的农场，难产情况更多。规定采用引导饲养的农场，产乳热和真胃左方变位的可能性增加。奶农自行处理胎衣不下病例的农场比兽医处理的农场胎衣不下情况更多。报告在干奶期给奶牛喂食以增加体重做法的农场，酮病几率增加。
