牛乳中体细胞数与脂肪酸含量的相关性分析

Correlation Analysis between Somatic Cell Count and Fatty Acid Compositions in Milk of Dairy Cows

目的:研究牛乳中体细胞数(somatic cell count,SCC)对乳脂肪酸含量的影响。方法:采集474头处于泌乳早期(30~100 d)的中国荷斯坦奶牛乳样,测定乳中SCC及各种脂肪酸单体的含量,分析乳中SCC对脂肪酸相对含量的影响及相关性。结果:SCC极显著影响乳中C4∶0、C16∶1、cis9,trans11-CLA和C18∶3 n3脂肪酸单体的含量(P<0.01)。同时,随着乳中SCC的升高,多不饱和脂肪酸(polyunsaturated fatty acid,PUFA)的相对含量也显著增加(P<0.05)。相关性分析显示乳中SCC与PUFA含量呈极显著正相关(P<0.01),与短链脂肪酸含量呈显著负相关(P<0.05)。结论:研究结果初步揭示了乳中SCC与乳脂肪酸相对含量的关系,为进一步揭示SCC对牛乳品质的影响提供了依据。

Purpose: The study was carried out to investigate the correlation between somatic cell count (SCC) and the profile of fatty acids in milk of dairy cows. Methods: Four hundred and seventy four milk samples from early lactating (30–100 days) dairy cows with no clinical mastitis were determined for SCC and milk fatty acids. The effect of SCC on the contents of milk fatty acids and the correlation between SCC and milk fatty acids were analyzed by the software SAS 9.0. Results: SCC had a significant effect on C16:1, cis9, trans11-CLA and C18:3 n3 (P < 0.01). The relative levels of polyunsaturated fatty acids (PUFA) were significantly positively correlated with SCC in milk (P < 0.05), but a significantly negative correlation was found between SCC and short-chain fatty acids (SCFA) (P < 0.01). Conclusions: These results reveal a negative correlation between SCC and SCFA in milk of dairy cows.