In winter and spring, there is less hay and crude protein and other nutrients are insufficiently supplied. At this time, the temperature is low, and the energy consumption of the carcass is high. The ewes need more nutrients 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 supplementation. 1. The nitrogen source commonly used for supplemental nitrogen sources is urea, which does not exceed 1% of the sheep's dietary dry matter or 2-3% 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 sheep poisoning caused by improper feeding of urea, can be fed a lot of cold water or moderate amounts of dilute acetic acid, yogurt, vinegar, etc., conditions can be fed to the sheep 10% of acetic acid plus glucose mixture of 1.5-2 liters. 2. Rumen protein and ruminal starch supplementation through rumen technology can increase the feed intake of sheep and promote the absorption of amino acids in the small intestine, thereby increasing the production of wool and milk production. 3. Adding Fermentation Feeds for cereals such as barley, wheat, oats, corn, and sorghum that contain more starch can increase the fermentation energy of the diet and increase the sheep's utilization of roughage. 4. Supplementing silage feeding a small amount of silage corn in the withered period can promote the growth of rumen microbes in sheep and increase its utilization rate for roughage. 5. Mineral supplements Minerals such as calcium, phosphorus, sodium, potassium, selenium and copper, which may be lacking in mineral sheep, may be supplemented by mixed feeding or salt bricks, mineral pellets, or sustained-release devices.
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