Cows, like huma , produce i ulin-like growth factor in re o e 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。