First of all, to meet the nutritional needs of boars is a necessary condition to ensure the boar's robustness and longevity. Second, timely exercise, single-circle feeding, and cooling in the summer's defensive department are three elements of scientific management of boars. Exercise is an effective measure to promote blood circulation and strengthen the system. Thirdly, it is advisable for boars to be raised in a single lap. Each pighouse has an area of ​​6 to 7.5 square meters. The breeding boar should be far away from the sow house and must not be kept in a pig house with the sow. Fourth, strengthen summer management, do a good job in preventing heatstroke, and avoid the impact of heat stress on semen.
Collagen is the most abundant protein in mammals, accounting for 25% to 30% of the total protein. It is widely present in all tissues from the body surface of lower vertebrates to mammalian bodies. Collagen monomers are long cylindrical proteins with a length of about 280 nm and a diameter of 1.4–1.5 nm. It consists of 3 polypeptide chains that are supercoiled around each other.
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