In winter and spring withered grasses, sheep can not satisfy its nutritional needs simply by grazing, and it is necessary to feed some forages and feeds to meet the nutrients needed for its growth and development. In addition, sheep at special physiological stages, such as pregnant ewes, nursing sheep, breeding rams in addition to grazing should strengthen feeding. In winter and spring, not only are the grass less dry, but the crude protein content of forage grasses is significantly lower than that of the growth period (13.6% - 15.57% in the growth period, 2.26% - 3.28% in the withered grass period, and this is the coldest season of the year. The increase in energy consumption, if not supplemented, will inevitably result in a decline in the production performance of the sheep, and when the nutrient is severely lacking, it will cause the death of the sheep.It has been proved that supplemental feeding of sheep in the withered period will promote growth and development, increase production performance, and increase Economic benefits of sheep industry: Langfang Animal Husbandry and Aquaculture Bureau Wu Shunguo et al. conducted a pilot study on the effect of winter supplementation of sheep in 1989. The experimental group sheep under the grazing conditions supplemented 250 grams of mixed feed each night, and the feed formulation was: urea 1.5%. 2% for bone meal, 2% for salt, 1.5% for sodium sulfate, 0.2% for trace elements, 0.01% for vitamin A, and 93% for corn. The average monthly weight gain of the experimental group was 2.64 kg more than that of the control group. The control group was more than 2.97 yuan, the economic effect was significant, and the feeding time of the supplementary feeding time in the sub-alfalfa period was determined according to the forage status of the grazing land and the traits of the flock, etc. Generally, the feeding was started around December, and the feeding time should be done before feeding. Good forage The supplementary feeding should be carried out continuously from the beginning, otherwise it will affect the sheep's grazing and feeding.The complementary feeding method can be arranged before grazing or after grazing, generally the fine material is supplemented before grazing, and the grass is supplemented after grazing. The fodder allocation should be based on the principle of weak first, strong after first, and strong after first, and can also pick out the poorly-divided sheep and feed it separately, and the nutrients can be improved and then fed with large groups. The pregnant ewes and lambs should be given Special care: In the utilization of forage, we must first feed the grass, the second material, and then feed the good material so that the sheep do not want to eat any more when they are used to the good grass. In order to prevent snatching, the best way to supplement the grass is to arrange it on the grass rack, which can reduce the trample waste of the forage. If the number of sheep is small, the forage grass can be put into the basket for feeding.