In the production of sows is very burdensome tasks, especially lactating sows, not only to provide their own needs of nutrition, but also to provide the survival of newborn piglets, growth and development of breast milk. However, the living environment for suckling sows in the hot season is more unfavorable, and high heat stress is a severe challenge for the sow to sow. Therefore, how to properly allocate nursing sows for summer diets and strengthen feed management should be issues that pig producers must actively consider and focus on.
1, diet preparation
1.1 Increase Energy Level
It should be ensured 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 must meet national standards. The choice of raw materials with high crude fiber content should be avoided, and appropriate amounts of fat (3%-5%) or high-quality soybean phospholipids (4%-6%) can be added to increase energy levels.
1.2 increase crude protein content
The crude protein content of the lactating sow diet in summer can be allocated to 18%, and high quality protein raw materials must be selected. It is recommended not to use chowder, but use high-quality soybean meal (crude protein content ≥ 44%), extruded soybeans, imported fish meal and other protein raw materials.
1.3 Balanced amino acids
The lysine content should be 1%, the methionine content is 0.23%, the cysteine ​​content is 0.46%, and the threonine content is 0.5%. Higher levels of lysine and ideal protein content are beneficial for the normal production of lactating sows.
1.4 Proper calcium and phosphorus ratio
The content of calcium should be 0.8%-1.0%, phosphorus 0.7%-0.8%, and effective phosphorus 0.45%. Phytase can be added to the diet to increase the absorption and utilization of phytate phosphorus. Poor or imbalanced calcium and phosphorus levels can cause rear leg paralysis in nursing sows. In the choice of raw materials should pay attention to the choice of high-quality calcium and phosphorus additives.
1.5 Add the necessary vitamins
Adding a certain amount of vitamin C (150-200 mg/kg) to the sow diet in summer can reduce hyperthermia stress. Beta-carotene increases lactation and shortens the distance from weaning to first oestrus. Vitamin E can enhance the body's immunity and anti-oxidation function, reduce the incidence of sow mastitis and metritis. In the absence of piglets, weaning weight of piglets and piglets can be reduced. Biotin is widely involved in the metabolism of carbohydrates, fats, and proteins. In the absence of biotin, it 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. Other essential vitamins, such as folic acid, pantothenic acid, choline, etc., should also be added in appropriate amounts and should not be ignored.
1.6 Diet Formula
The recommended formula is 58% for corn, 6% for bran, 15% for soybean meal, 5% for fish meal, 6% for soybean phospholipids, 6% for corn germ meal, and 4% for premix.
2, feeding method
The feeding target for lactating sows is to increase the number of weaned piglets and weaning weight, and to maintain normal body conditions during lactation, ie the 28-day weaning weight loss does not exceed 12 kg. 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 methods must be adopted around these goals.
2.1 Reasonable increase in feed intake
To maximize the sow's feed intake, the following measures can be taken. Free-feeding was conducted, and feeding was not limited, ie, the method of gradually increasing the feed intake after 3 days of delivery and achieving free access after 7 days. Doing less feeding Tim, implement a multi-course system, feed 4-8 times a day. Time-feeding is used to feed the animals in the early and late cool periods to stimulate the appetite of the sows 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 addition, in order to increase the palatability, we can take the method of feeding wet spices.
2.2 Supply sufficient clean water
There is a great demand for water for sows in summer, so sows’ drinking water should be kept 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.
2.3 Strengthen the control of temperature
You can use the rain curtain, ventilation fan, shade cloth, feed watermelon rind, heat Chinese medicine and other ways to prevent heatstroke.
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