The sow’s task is very heavy. In particular, nursing sows not only need to provide the nutrients they need, but also provide breast milk for the survival and growth of newborn piglets. However, the living environment for suckling sows in the high temperature season is more unfavorable, and high heat stress is a severe challenge for the sow to sow. Therefore, how to scientifically deploy sow's summer diet and strengthen feed management should be a problem that pig producers must actively consider and focus on.
Optimized preparation
Raising the energy level should ensure that dietary digestibility is above 14 MJ/kg and metabolic energy is above 13 MJ/kg. The main choice is high-quality corn, water must be controlled within 14%, and other indicators should reach the national standard or above. Avoid selecting raw materials with high crude fiber content to enter the diet. In addition, appropriate amounts of fat (3% to 5%) or high-quality soy phospholipids (4% to 6%) can be added to increase energy levels.
Increase crude protein content The lactating sow's dietary crude protein content can be allocated to 18% in summer. High-quality protein raw materials must be selected. It is recommended not to use chowder, but high-quality soybean meal (crude protein content ≥44%), puffed soybean, imported fish meal Protein raw materials.
The balanced amino acid lysine content should be about 1%, the methionine content is about 0.23%, the cysteine ​​content is about 0.46%, and the threonine content is about 0.5%. Higher levels of lysine and ideal proteins benefit the normal functioning of lactating sows.
Calcium, phosphorus ratio of the appropriate calcium content should be 0.8% to 1%, phosphorus is 0.7% to 0.8%, effective phosphorus 0.45%, in order to increase the absorption and utilization of phytate phosphorus can add phytase in the diet. Calcium, phosphorus content is too low or imbalance in the ratio can cause suckling sows hind limb paralysis, in the choice of raw materials should pay attention to the choice of high-quality calcium, phosphorus additives. Add the necessary vitamins. Add a certain amount of vitamin C (150-200 mg/kg) to the summer sow diet to reduce hyperthermia: Beta-carotene increases milk production and reduces weaning to the first oestrus interval; vitamin E Can enhance the body's immune system and antioxidant function, reduce the incidence of sows mastitis, metritis; lack of piglets can reduce the number of weaning and piglets diarrhea. Biotin is widely involved in the metabolism of carbohydrates, fats, and proteins, and biotin deficiency can cause dermatitis or hoof cracking in animals. The high temperature environment can reduce the synthesis of biotin in the intestinal bacteria of animals, so more biotin should be added to the feed. Vitamin D regulates calcium and phosphorus metabolism in the body. Some other essential vitamins such as B group, folic acid, pantothenic acid, and choline should also be added in moderation. Recommended formula: 58.0% corn, 6.0% bran, 15.0% soybean meal, 5.0% imported fish meal, 6.0% soybean phospholipids, 6.0% corn germ meal, 4.0% premix.
Feeding strategy
The feeding target of lactating sows is to increase the number of weaned piglets and the weight of weaned piglets. The second is to maintain normal body conditions during lactation, that is, weaning weight loss does not exceed 12 kg for 28 days. Excessive weightlessness can prolong the estrus after weaning, and can also result in a decrease in the number of litters in the next birth. The consequences are serious. Therefore, feeding strategies must be adopted around these goals.
Rationally increasing feed intake In order to maximize the sow's feed intake, the following measures can be taken: The first is to adopt free-feeding and unlimited-feeding. That is, from the three days after giving birth, gradually increase the amount of food intake, to achieve free access to food after 7 days; the second is to do less feeding Tim, implement a multi-course system, feeding 4 to 8 times a day, the third is the implementation of Time-feeding, using the early and late cooling time feeding, fully stimulate the sows' appetite and increase their feed intake. No matter what kind of feeding method should pay attention to ensure that the feed is fresh, hygienic, should not feed mold, deterioration (rancidity). In order to increase palatability, we can adopt the method of feeding wet mix.
Providing sufficient clean water The demand for drinking water from sows in summer is very high. Therefore, the sows’ drinking water should be guaranteed to open. If it is a sink-type drinking water, it should always be filled with fresh water. If it is an automatic drinker, it must be observed and inspected to ensure unimpeded flow, and the water flow rate and flow rate must reach a certain level. Drinking water should be clean and meet hygienic standards. Insufficient or unclean drinking water can affect sow feed intake and digestive lactation.
Strengthen the temperature control can be installed through the rain curtain, ventilation fan, shade cloth, feeding watermelon rind, heat Chinese medicine and other ways to prevent heatstroke.
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