But in fact, the success rate of breeding and the survival rate of cattle are less than 65,438+0,000%. Seven cows have bred 30 cows in five years. 1 head Niu Yi eats about 3,500 yuan of grass feed every year, which is about 3,500 kilograms of grass or 1.500 kilograms of coarse feed such as hay and straw. Plus labor, site, water and electricity, medicine, etc. The burden of not selling at all is heavy.