摘要
选用36头经产奶牛,根据泌乳期、上一泌乳期305 d产奶量和预产期,采用随机区组设计分为4组,对照组饲喂基础日粮,处理1,2和3组分别在基础日粮基础上添加丙酸镁50,100和150 g/d,研究丙酸镁对泌乳早期奶牛采食量、泌乳性能、血液代谢参数和尿酮浓度的影响。结果表明,添加丙酸镁对奶牛的采食量、乳脂率、乳蛋白率、乳糖率和乳干物质率无显著影响,添加丙酸镁100和150 g/d对产乳量、饲料转化效率、体况及代谢参数有改善,该二处理组产奶量、饲料转化效率、体况评分、能量平衡、血浆葡萄糖和胰岛素浓度均显著高于对照组(P<0.05),而血浆游离脂肪酸和β-羟丁酸浓度显著低于对照组(P<0.05),尿酮浓度(除100 g/d组产后7 d测定值与50 g/d组无显著差异外)显著低于对照组和50 g/d组(P<0.05)。根据试验结果,丙酸镁适宜添加量为100 g/d。
The effects of magnesium propionate on lactation performance and metabolic parameters in early lactation Holstein dairy cows were evaluated using thirty-six multiparous Holstein dairy cows. They were blocked by lactation number, corrected milk yield in last lactation, and expected calving date, then designated into four treatments （0, 50, 100, and 150 g/d） of magnesium propionate supplement in a randomized block experiment. Average feed intake, milk fat percentage, milk protein percentage, milk lactose percentage and milk dry matter percentage were not affected by magnesium propionate supplementation （P〉0.05）. Milk yield, feed efficiency, body condition and metabolic parameters of cows supplemented with magnesium propionate at 100 and 150 g/d were significantly （P〈0.05） better than the controls as were energy balance and concentrations of glucose and insulin in the cow＇s plasma. With magnesium propionate supplements of 100 and 150 g/d, the concentrations of non-esterified fatty acids and β-hydroxybutyrate in plasma of cows were lower than those of the controls （P〈0.05）. The concentrations of urine ketones were significantly （P〈0.05） lower than in cows with a magnesium propionate supplement of 50 g/d and of the controls. The optimum dose of magnesium propionate supplementation was 100 g/d.
出处
《草业学报》
CSCD
北大核心
2009年第4期187-194,共8页
Acta Prataculturae Sinica
基金
"十一五"国家科技支撑计划项目(2007BAD56B04)资助
关键词
丙酸镁
泌乳性能
代谢产物
泌乳早期
荷斯坦奶牛
magnesium propionate
lactation performance
metabolites
early lactation
Holstein dairy cows
作者简介
李红玉（1973-），女，山西祁县人，实验师，硕士。E—mail：lihongyu289@126．com
