Sweet potato and its stems and leaves. Sweet potato stems and leaves are green and juicy, with high sugar content and good palatability. The feeding effect is good after fresh food or silage. The daily intake of dairy cows is15 ~ 20 kg, and the intake of sweet potatoes and stems and leaves of dairy goats is reduced according to their weight. Potato blocks with black spot disease and hot or moldy sweet potato stems and leaves cannot be used to avoid poisoning. High-quality forage should be the basis of most dairy cows' diets. Cows are generally free to eat high-quality alfalfa hay. Middle-yield cows can get 70% milk potential only by feeding high-quality pasture without grain, while low-yield cows can get all milk potential without supplementing grain. Dairy cows with higher yield have a larger proportion of grains and other concentrate in their total diet. Some cows' diets consist entirely of concentrate. Generally speaking, the whole concentrate diet is not suitable for maintaining the health of dairy cows and the quality of milk products (low milk fat is usually composed of this diet).
Good grazing land provides high-nutrient feed that cows like, especially newly grown cows. In addition, cows can eat freely, but trampling grazing (unless carefully managed) will cause a lot of crop waste, and the nutrition and milk yield per hectare is lower than weeding, and the yield of cows may fluctuate due to different pasture growth types and weather conditions. In addition, the problem of parasites in particular is often related to grazing, especially irrigation and natural grazing in swamps.
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