Kent B A, Arambel M J
Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan 84322-4815.
J Dairy Sci. 1988 Sep;71(9):2412-5. doi: 10.3168/jds.S0022-0302(88)79826-4.
Twenty dairy cows in early lactation were assigned to one of two dietary treatment groups based on milk production and days in milk. Treatments were a total mixed ration containing 13.2% whole cottonseed on a DM basis with or without added Ca salts of long-chain fatty acids. Treatments were fed ad libitum for 11 wk. Dry matter intake and body weight were not affected by treatment. The addition of Ca salts of long-chain fatty acids had no effect on yield of actual and FCM. Percent milk fat, lactose, and SCC did not differ between treatments. Percent milk protein tended to be lower for cows fed the diet containing calcium salts of long-chain fatty acids. Milk production efficiencies and NDF and ADF digestibilities were unaffected by treatment. Results indicate that diets containing high amounts of cottonseed may mask th affects of energy provided by Ca salts of long-chain fatty acids.
根据产奶量和泌乳天数，将20头处于泌乳早期的奶牛分配到两个日粮处理组之一。处理方式为基于干物质的全混合日粮，其中含有13.2%的全棉籽，添加或不添加长链脂肪酸钙盐。自由采食处理日粮11周。干物质采食量和体重不受处理影响。添加长链脂肪酸钙盐对实际产奶量和校正乳产量没有影响。处理组之间乳脂肪、乳糖和体细胞数百分比没有差异。饲喂含长链脂肪酸钙盐日粮的奶牛乳蛋白百分比往往较低。产奶效率以及中性洗涤纤维和酸性洗涤纤维消化率不受处理影响。结果表明，含有大量棉籽的日粮可能掩盖长链脂肪酸钙盐提供的能量的影响。
