Nielsen T K, Jensen K
National Veterinary Laboratory, Copenhagen.
Acta Vet Scand. 1991;32(3):301-6. doi: 10.1186/BF03546958.
Concentrations of acetoacetate, D-3-hydroxybutyrate, glucose and free fatty acids were determined in blood from 3 Jersey cows during a 5-months period. The cows were fed an identical complete feed every hour, from ad libitum intake to maintenance level, for 28 days at each of the following levels of intake: 170, 138, 102, 53 and 37 g organic matter per kg bodyweight0.75 (metabolic bodyweight). Throughout the experimental period, the cows were in negative energy balance, which was reflected in an average weight loss of 640 g per day. None of the metabolites differed from reference values for healthy lactating cows. The concentration of D-3-hydroxybutyrate decreased linearly with the level of feeding and reflected a decreased ruminal production of butyrate. The high feeding frequency to lactating cows may be considered an essential factor in the prevention of ketosis.
在5个月的时间里，对3头泽西奶牛的血液中的乙酰乙酸、D-3-羟基丁酸、葡萄糖和游离脂肪酸浓度进行了测定。在以下每种采食量水平下，每小时给奶牛投喂相同的全价饲料，从自由采食量降至维持水平，持续28天：每千克体重0.75（代谢体重）摄入170、138、102、53和37克有机物。在整个实验期间，奶牛处于负能量平衡状态，这表现为平均每天体重减轻640克。所有代谢物均与健康泌乳奶牛的参考值无差异。D-3-羟基丁酸的浓度随采食水平呈线性下降，反映出瘤胃中丁酸产量的降低。对泌乳奶牛高频率投喂饲料可被视为预防酮病的一个重要因素。
