In the early spring season, there was less hay and crude protein and other nutrients were in short supply. Coupled with the low temperature and high energy consumption of the carcass, the ewes needed more nutrition for pregnancy, lactation, long hair and long velvet. Grazing is far from meeting its nutritional needs and must be supplemented by supplementary feeding. For the main nutrient-limiting factors for grazing, the following methods can be used for feeding: First, supplement nitrogen source Second, the use of rumen technology Third, increase the fermentation energy Supplementing grain feeds containing more starch, such as barley, wheat, oats, corn, and sorghum, can increase the fermentation energy of the diet and increase the sheep's utilization of roughage. Fourth, make up silage Fifth, supplement minerals The mineral elements that may be lacking in sheep include calcium, phosphorus, sodium, potassium, selenium, copper, etc. They may be supplemented by mixed feeding or salt bricks, mineral pellets, and sustained-release devices.
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The commonly used nitrogen source is urea, which does not exceed 1% of the sheep's dietary dry matter or 2 to 3% of its concentrate feed. The specific feeding amount of urea depends on the amount of energy feed in the sheep's diet. Generally, the energy feed can be fed for a long time, and the feed for energy can be fed less when the energy feed is low. Urea must be fed with digestible concentrate or a small amount of molasses, moderate amounts of sulphur and phosphorus, and fed in small amounts one after another. It cannot be fed with bean cakes or quail, nor can it be used to feed sheep that are in conditions of disease and starvation. Poisoning. When using, urea should be sprinkled in the wet concentrate to make it evenly dissolved. It is forbidden to be dissolved in water or fed separately. Sheep fed a urea diet cannot drink water immediately, and it is advisable to drink water after stopping feeding for two hours. If urea is fed improperly to cause sheep poisoning, a large amount of cold water or a proper amount of dilute acetic acid, yogurt, vinegar, etc. can be fed, and the sheep can be fed with 10% acetic acid plus glucose mixture 1.5 to 2 liters under certain conditions.
Supplementing rumen protein and ruminal starch can increase feed intake of sheep and promote amino acid absorption in the small intestine, thereby increasing wool production and milk production.
Supplementing a small amount of silage corn in the withered period can promote the growth of rumen microbes in sheep, and improve its utilization of roughage.
