Introduction: Vitamin D is closely related to the absorption and utilization of calcium and phosphorus.
Vitamin D is closely related to the absorption and utilization of calcium and phosphorus. Only with the participation of vitamin D, calcium and phosphorus can play a role in the formation of bones and teeth and other tissues. Otherwise, even if calcium and phosphorus are abundant, the proportion is appropriate. The utilization rate is also greatly reduced. Because vitamin D can promote the absorption of calcium in the intestine, inhibit the calcium ions in the blood from the wall of the large intestine, so as to maintain the normal level of calcium, and promote the deposition of calcium in the bones. At the same time, vitamin D blocks the discharge from the kidney and stores it in the body. Long-term lack of vitamin D can impede the absorption and metabolism of calcium and phosphorus, resulting in incomplete bone calcification, so that the piglets suffer from rickets, so that the adult pig bone dissolved inorganic salts and suffering from cartilage disease. When pregnant sows are severely deficient in vitamin D, not only will the piglets have a weak constitution and prone to rickets, but they will also give birth to deformed piglets. Generally, the content of vitamin D in green feed is very low, and some feeds are almost free of vitamin D, such as grass, rhizomes and cereals. However, most plant foods contain ergosterol. After harvesting, ergosterol can be converted to vitamin D through ultraviolet radiation in sunlight. Therefore, the content of vitamin D in sun-dried hay is relatively simple. Animal diets have the most abundant vitamin D content in cod liver oil and liver powder. In addition, there is a small amount of 7-dehydrocholesterol in the skin of the pig, which is higher than other livestock and poultry, and can be converted into vitamin D3 after ultraviolet irradiation in sunlight. To prevent vitamin D deficiency in pigs, the most effective and easiest way is to keep the pigs in the sun. This is especially important for pregnant sows, lactating sows and piglets.
Vitamin D is closely related to the absorption and utilization of calcium and phosphorus. Only with the participation of vitamin D, calcium and phosphorus can play a role in the formation of bones and teeth and other tissues. Otherwise, even if calcium and phosphorus are abundant, the proportion is appropriate. The utilization rate is also greatly reduced. Because vitamin D can promote the absorption of calcium in the intestine, inhibit the calcium ions in the blood from the wall of the large intestine, so as to maintain the normal level of calcium, and promote the deposition of calcium in the bones. At the same time, vitamin D blocks the discharge from the kidney and stores it in the body. Long-term lack of vitamin D can impede the absorption and metabolism of calcium and phosphorus, resulting in incomplete bone calcification, so that the piglets suffer from rickets, so that the adult pig bone dissolved inorganic salts and suffering from cartilage disease. When pregnant sows are severely deficient in vitamin D, not only will the piglets have a weak constitution and prone to rickets, but they will also give birth to deformed piglets. Generally, the content of vitamin D in green feed is very low, and some feeds are almost free of vitamin D, such as grass, rhizomes and cereals. However, most plant foods contain ergosterol. After harvesting, ergosterol can be converted to vitamin D through ultraviolet radiation in sunlight. Therefore, the content of vitamin D in sun-dried hay is relatively simple. Animal diets have the most abundant vitamin D content in cod liver oil and liver powder. In addition, there is a small amount of 7-dehydrocholesterol in the skin of the pig, which is higher than other livestock and poultry, and can be converted into vitamin D3 after ultraviolet irradiation in sunlight. To prevent vitamin D deficiency in pigs, the most effective and easiest way is to keep the pigs in the sun. This is especially important for pregnant sows, lactating sows and piglets.
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