Cows, like humans, produce insulin-like growth factor in response to growth hormones and release it into the blood, and the protein makes its way into their milk.
奶牛和人一样，也能在生长激素的作用下分泌类胰岛素生长因子，这种蛋白质被释放到血液里，从而进入到牛奶中。
One reason this may be so frequently found is because cows have been selectively bred this way to increase the protein content of the cow-milk (a quality desired by dairy producers). 9
其原因之一可能因为牛是通过选择性繁殖的方式来提高牛奶的蛋白质含量（乳品生产者所期望的品质）的。
We've got a division that looks at the breeding of cows to get better attributes out of the milk, more protein for example, maybe less fat, less saturated fat.
我们有一个部门就是研究牛奶的育种，以获得更加优质的牛奶成份，比如蛋白质更多，或许脂肪更少，饱和脂肪更少。
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