摘要
Abstract
Vitamin D3 is often considered to be a"sunshine vitamin",which is because most animals can be synthesized under ultraviolet irradiation,that is,vitamin D3 is an essential vitamin in the animal body,with significant fat solubility.At the present stage,animal breeding in China shows a certain trend of intensive development.The closed feeding method is selected to reduce the time of animals being exposed to sunlight,and the vitamin D3 content can not be obtained to promote their healthy growth.After a long time,the production of vitamin D3 in the animal body prevents the body from fully absorbing calcium and phosphorus,and reduces the animal's immune ability,reproductive level and production performance.When the content of vitamin D3 is relatively high,the process of animal metabolism is hindered,reducing the speed of metabolism in the body,and even causing harm to animal survival.Specific manifestations,the typical symptoms of vitamin D3 deficiency are chondrosis or rickets,D3 precursor deficiency(7-dehydrocholesterol deficiency),can reduce D3,25-OHD3 synthesis,and then produce vitamin D deficiency,high-yield cows due to calcium deficiency postpartum paralysis,Chicken bone structure deformation,Osteochondrosis in pigs and horses grows too rapidly,A lack of bone mineralization,known as tibial chondrodysplasia,can be seen in overweight chickens and turkeys.关键词
佝偻病/胫骨软骨发育不良/产乳热/骨质疏松症Key words
rickets/tibial chondrodysplasia/galactogenesis fever/osteoporosis分类
农业科技
