南京地区奶牛亚临床酮病的研究

南京农业大学实习牧场1983年9月至1984年1月发生的奶牛亚临床酮病是由于饲料中无氮浸出物比例偏低,能量和蛋白质比例不当,导致能量物质尤其是生糖先质相对缺乏,而使母牛体内发生能量负平衡所致。在该场35头血,乳采样母牛中,先后有13头发生亚临床酮病。其生化特征为酮血症,乳丙酮水平升高,伴有血糖浓度轻度降低,血清游离脂肪酸、血清总蛋白浓度有升高趋势。亚临床酮病在产犊后10—30天发病率最高。早期诊断亚临床酮病应着重考虑母牛的发病时间、饲养病史,泌乳量以及血、乳生化分析的结果。为防治此病,可在饲料配方中添加高能饲料如玉米等。

STUDY ON SUBCLINICAL KETOSIS IN DAIRY COWS IN NANJING AREA

From Sept. of 1983 to Jan. of 1984, 13 cows suffered from subclinical ketosis among 35 cows were studied in the Practice Dairy Farm of Nanjing Agricultural University. The main causative factor was that the ration fed to dairy cows containing less soluble carbohydrate and unsuitable proportion of energy and protein led to relative insufficiency of energy and negtive energy balance in cows in early lactation. The biochemical characteristies of subclinical ketosis were ketonemia, elevated milk acetone level, with slightly lower blood glucose and slightly increased serum free fatty acids and total serum protein level. Subclinical ketosis occurred most commonly from 10 to 30 days after parturition. The duration of suffering from ketosis after parturition, harmful feeding history, milk production and the results of biochemical analysis of blood and milk samples could be most important to the diagnosis of subclinical ketosis at an early date. In ordcr to control this disease, our suggestion is to increase corn or barley meal in the ration.