Bachman K C, Wilcox C J
J Dairy Sci. 1976 Aug;59(8):1381-7. doi: 10.3168/jds.S0022-0302(76)84373-1.
Average cholesterol content of 356 raw milk samples was 152.2 mug/ml and upon centrifugation (3000 X g for 8 min), 16.9% was distributed in the skim milk phase. Lipid phosphorus averaged 19.0 mug/ml and was partitioned 50:50 between cream and skim milk phases. Weight ratios of cholesterol to lipid phosphorus for milk and skim milk were 8.30:1 and 2.94:1. When variation due to milk yield, fat percent, and somatic cell numbers (deoxyribonucleic acid percent reflectance) was accounted for by least squares, cholesterol content and distribution did not differ among breeds (Holstein, Jersey, and Guernsey). Breed differences in lipid phosphorus content of whole milk could not be detected. However, Holsteins had a significantly lower content of lipid phosphorus and a higher weight ratio for skim milk. Milk yield, fat content, and somatic cells affected responses of cholesterol and lipid phosphorus. This supports a multiple origin concept for membrane material in skim milk.
356份生乳样品的平均胆固醇含量为152.2微克/毫升，经离心（3000×g，8分钟）后，16.9%分布于脱脂乳相中。脂质磷平均为19.0微克/毫升，在乳脂和脱脂乳相之间的分配比例为50:50。乳和脱脂乳中胆固醇与脂质磷的重量比分别为8.30:1和2.94:1。当通过最小二乘法对产奶量、乳脂肪百分比和体细胞数（脱氧核糖核酸百分比反射率）引起的变异进行校正后，各品种（荷斯坦牛、泽西牛和根西牛）之间的胆固醇含量和分布没有差异。未检测到全脂乳脂质磷含量的品种差异。然而，荷斯坦牛的脱脂乳脂质磷含量显著较低，重量比更高。产奶量、脂肪含量和体细胞数影响胆固醇和脂质磷的含量。这支持了脱脂乳中膜物质的多源概念。
