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After the calving of dairy cows reaches 120 days, the amount of milk produced accounts for 60-65% of the total milk in the whole lactation period. In the actual production, because the milk production level and nutritional needs of cows at each stage differ significantly, it is not possible to use the same diet for raising the cows in different lactation stages. At home and abroad, it is advocated to adopt the three-stage feeding method of early stage of secretory milk, middle period of lactation and late stage of lactation. First, in the early lactation period, cows start from calving until 70 days after childbirth. The appetite of dry matter intake is not completely restored but is about 15% lower than that of late lactation. During this period, the average weight of the cow will be reduced by 35-50kg, and the average daily weight will be reduced by 0.5-0.7kg. In some cases, the average daily weight may be reduced by 2-2.5kg. At the beginning of lactation, the proportion of concentrate and roughage, calculated as dry matter, is about 55-60%: 45-40%, respectively, and its feeding methods are the following two: 1. China's traditional feeding method: After cows are calving, Let it freely feed quality hay and try to avoid feeding too much corn silage. After feeding the concentrate, observe the eating conditions on the day. If no concentrate is left, and if a lot of hay is eaten, the spirit, defecation, rumination, etc. are normal, and the amount of milk is also increased, 0.5-1 kg of fine material can be fed daily, or else feeding can not be performed. The daily concentrate feed is fed in 3 times. Generally, the amount of feed is not more than 3kg each time, and it should be fed after being mixed with the coarse material. 2. Full-price diet feeding method: Calculate the required nutrient content of dairy cows according to factors such as milk production, milk fat percentage, body weight, and weight loss at the beginning of lactation, and then calculate the corresponding dietary nutrient level and total amount of modulation. Feed formulation, and then add the short roughage, concentrate, dregs feed, buffer, mineral elements, vitamins and other additives mixed with a special mixer (or artificial), for cattle to eat freely. This will not cause digestive dysfunction, rumen acidosis, overeating and other issues, and the large amount of food, nutritional balance, milk volume increased rapidly. Second, the mid-lactation? Cows 71-140 days after childbirth, the peak period of lactation just passed, but dry matter intake peaked, weight began to recover. At this stage, the nutrients obtained by the cow need to be used to restore lost weight after birth, in addition to the maintenance and milk production needs. If the excess nutrient obtained by the cow is balanced and the uterus returns to normal, the cow can be in normal heat and be pregnant 90-110 days after childbirth. It is very important to feed full-rate feeds in the mid-lactation period. The main points of feeding techniques are: 1. Feeding full-price diets to maintain the need for additional milk production, regardless of weight changes. 2. For high-yielding dairy cows with a daily milk output higher than 35kg, buffers should be added either on weekdays or in summer. Potassium chloride or fat powder should be added in summer to facilitate the heat stress of high-yielding dairy cows (in southern Yulin, non-high-yielding dairy cows should also prevent the occurrence of heat stress). 3. In summer, in order to prevent the influence of heat on the appetite of cows, it may be fed before the 3-5 o’clock in the morning and at the lowest temperature in order to increase the amount of food intake and prevent and reduce the occurrence of high-yielding cows during this season. Body fat production phenomenon. Third, the late lactation? 141-305 days after calving is the late lactation, the cow has entered the middle and late pregnancy, the nutritional needs including maintenance, lactation, repair body tissue, fat growth and pregnancy sedimentary nutrients and other five aspects, so Cows need more nutrients. The main points of feeding technology in this period are: 1. The dietary supply should be based on the cow's milk production level and the actual situation. As long as the cows are medium quails (the ribs are obviously exposed), different nutritional levels are provided according to different levels of milk production. Diets, with special attention should be paid to prevent the cows from becoming over-fat. 2. Perform a rectal examination before stopping the baby to determine whether it is pregnant so that the baby can stop in time. Some cattle may have twins, and the cattle should be raised reasonably during the dry period. ? 3, prohibit the feeding of frozen or moldy feed, pay attention to the protection of the cows to prevent mechanical abortion.