Department of Animal Breeding, Warsaw University of Life Sciences, Warsaw, Poland.
J Sci Food Agric. 2012 Sep;92(12):2494-9. doi: 10.1002/jsfa.5658. Epub 2012 Mar 29.
So far, in research studies, the age of cows has not been considered as a factor that may influence the changes in the content of milk ingredients with antioxidant properties modified by the feed supplementation. The aim of this study was to determine the influence of supplementation on the content of ingredients having antioxidant properties and to determine the influence of the age of cows taking part in the experiment on these changes. The experiment was conducted using 20 Polish Holstein Friesian cows, 10 primiparous and 10 multiparous. The combined supplementation of fish oil and linseed constituted the experimental factor.
The milk of primiparous cows after 21 days of supplementation was characterised by a higher content of C18:1 trans-11, C18:2 cis-9, trans-11, α-retinol, α-tocopherol and β-lactoglobulin compared to the milk of multiparous cows, in which a higher level of lactoferrin, C20:5 and β-carotene was recorded. In both groups an increase in the total antioxidant status was noted (a higher level in the milk of primiparous cows).
Modification of the diet of cows with fish oil and linseed significantly influenced antioxidant properties of their milk; however, the response of multiparous and primaparous cows was noticeably different to the supplement introduced.
迄今为止，在研究中，奶牛的年龄尚未被认为是可能影响饲料补充对具有抗氧化特性的牛奶成分含量变化的因素。本研究的目的是确定补充剂对具有抗氧化特性的成分含量的影响，并确定参与实验的奶牛的年龄对这些变化的影响。该实验使用了 20 头波兰荷斯坦弗里生奶牛，其中 10 头初产牛和 10 头经产牛。鱼油和亚麻籽油的联合补充构成了实验因素。
补充 21 天后，初产牛的牛奶中 C18:1 trans-11、C18:2 cis-9、trans-11、α-视黄醇、α-生育酚和β-乳球蛋白的含量高于经产牛，而经产牛的乳乳铁蛋白、C20:5 和β-胡萝卜素含量较高。两组总抗氧化状态均有所增加（初产牛牛奶中的水平更高）。
用鱼油和亚麻籽油对奶牛的饮食进行修饰显著影响了其牛奶的抗氧化特性；然而，多产牛和初产牛对所引入的补充剂的反应明显不同。
