Feeding pigs with raw feed not only saves fuel, saves money, and saves labor, but also increases pig feed intake, promotes weight gain, and improves feed returns. (A) The choice of raw feed The raw feed can be mainly grass seed, such as corn, wheat, rice and other processing by-products such as rice bran, wheat bran and so on. If these raw materials are cooked, there will be some loss of nutrients and the feeding effect will not be as good as that of raw materials. In addition, green feed should also be fed. When cooked, most proteins and vitamins are destroyed. However, the actual feed of legume seeds, such as soybeans, bean cakes, peanut bran, and bean dregs, contains an anti-trypsin, which can hinder the digestion and absorption of legume proteins by trypsin in pigs. Such feeds cannot be fed and must be cooked at high temperatures. Cook to feed. (b) The raw feeding method can be divided into wet and dry feeding. The ratio of wet feed to water should not exceed 1:2.5, otherwise it will reduce the activity of various digestive enzymes and affect the digestion and absorption of feed. The optimum ratio should be 1:1. It is advisable to use a well-mixed feed to squeeze water. Dry feed is fed in the form of powder and then fed after eating. The benefits of dry feeding: First, the feed is not easy to degenerate, can be fed for a few days, less artificial; second, can be made of dry powder of various agricultural and sideline products, combined with feeding, open up a variety of feed sources. (3) Raw materials should be cleaned and detoxified raw feeds should be given to pigs. Washing and disinfecting should be taken care of so as not to infect parasites. The disinfection method can be soaked with lime water or potassium permanganate solution. The best method is to fertilize the feed without using pig manure or only fermented pig manure to prevent egg contamination. Buckwheat, rapeseed cakes, cottonseed cakes, and fresh cassava, which contain certain toxins, generally must be crushed, immersed in water, fermented or silaged, and must be fed before the toxins are removed. (D) Raw material crushed should be suitable for raw material crushed particles with a diameter of 1.2--1.8 mm. This type of pig is refreshing, has a large feed intake, and is long and fast. Diameter less than 1 mm, when the pig eats sticky mouth, affect palatability, and can easily cause gastric ulcer. (E) The fine green material should be fed separately to the pigs when the hunger is staring, the secretion of digestive juice is most prosperous, the concentrate feed is rich in nutrients, the volume is small, the crude fiber is less, the palatability is good, the quality is high, and it is easy to digest, so the concentrate should be fed first. Such as fine green mixed feed, due to the large volume of green materials, more water, reducing the digestibility and utilization of the fine material. And the excessive moisture in the green material dilutes the digestive juice, thereby reducing the digestive function. (6) The amount of raw material to be fed should be suitable for raw feed to feed pigs, and the amount of feed differs depending on the pig's different growth stages and production performance. Piglets and fattening pigs can be allowed to feed freely; breeding pigs are not, they must be supplied in a quantitative manner, otherwise, due to overfeeding, fat deposits are caused and affect breeding. Usually non-breeding species of boar, the amount of concentrate material to be controlled at 2-2.5 kg, breeding period can be fed 3-3.5 kg; pregnant sows, the amount of concentrate material is 2-2.5 kg, breast-feeding period It is 5--6 kg. (g) Pigs that supply enough water to feed dry materials should supply enough drinking water. Drinking water in winter is 2 to 3 times that of dry feed, 4 times in spring and autumn, and 5 times in summer. In particular, lactating sows and piglets must not be deficient in water, otherwise they will affect the sow’s milk secretion. The water quality should be clean and the water temperature should be warm in winter and cool in summer.
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