Comprehensive measures to improve the body weight of weaned pigs

If the piglets are weaned at the same age, the greater the individual weight of weaned piglets, the stronger their physique, the stronger the vitality of piglets, the faster the weight gain after weaning, the higher the feed conversion rate and the higher economic benefits. Therefore, taking comprehensive measures to strive for the maximum individual weight of weaned piglets has become one of the keys to improve the economic benefits of weaned piglets.

1. Long sows were selected and crossbred to improve the birth weight of piglets. The birth weight of piglets determines the vitality and weight gain rate of piglets to a certain extent. Long sows have more space for their placenta and fetus to develop, thus increasing the birth weight of piglets. The birth weight of hybrid progenies was also higher than that of purebred progenies in multivariate hybridization.

2. Feed sows during pregnancy scientifically and rationally to ensure that sows give birth to strong and newborn piglets. Pregnant sows can not be overweight, excessive abdominal fat affects the extension of the fetus and placenta, but also affects the development of the fetus, such as the lack of nutrition of sows during pregnancy, the birth weight of piglets will also be reduced. When raising sows, the corresponding feeding methods should be adopted according to the fat condition of sows: for the sows with poor body condition after weaning, it is appropriate to adopt the feeding method of "catching two heads and taking care of the middle", that is, nutrition should be strengthened in the early stage of pregnancy and raised according to the standard after the recovery of body condition. after 80 days of pregnancy, in order to promote fetal growth, and then strengthen nutrition. The sows with good pre-mating condition should be fed with more green roughage in the early stage of pregnancy and concentrate in the later stage.

3. Strengthen the feeding of lactating sows and improve the lactation ability of sows. If sows have enough milk to feed their piglets, there will be a reliable guarantee for the weight gain of thousands of pigs during lactation. The main measures to improve the lactation ability of sows are as follows: (1) the methods of prenatal diet reduction and postpartum feed increase are adopted to ensure a good appetite of sows. Three days before parturition, the feed intake of sows was reduced to 1 × 3 × 1 / 2, and stopped on the day of delivery. After 3 days of production, the amount of feed was added to the original amount, and then the amount of feed increased gradually with the increase of lactation days. (2) feed more green succulent feed and root tuber feed to increase lactation. (3) massage the breasts. Breast massage was given to parturient sows every day from 15 days before delivery for a continuous month, and good results were obtained. (4) to increase the concentration and types of feed nutrients for sows to ensure the nutritional needs of sows for lactation. Compound feed for lactating sows should contain digestible energy 13.1 megajoules per kilogram, digestible crude protein 146 grams, calcium 0.6%, phosphorus 0.4%. (5) Chinese herbal medicine was used to promote the lactation of sows with low lactation.

4. Pay attention to the feeding and management of suckling piglets. The main results are as follows: (1) give newborn piglets a suitable ambient temperature. Newborn piglets have few coat, thin subcutaneous fat layer and fear of cold, so they must live in a higher ambient temperature. It was 34 ℃ within 4 days after birth and 25 ℃ ~ 30 ℃ after 7 days old. (2) timely feeding colostrum and artificial fixed nipple after birth. Piglets should be fed colostrum immediately after the navel is severed and give birth to one. The whole litter piglets can be trained to fix the nipple after birth, and the strong piglets eat the last nipple, and mark the pig body after arranging. Each piglet is placed on the designated nipple during each feeding. After 2-3 days, the piglet's nipple can be fixed. (3) early feeding. From 5 to 7 days after birth, piglets were induced to eat with special full-price feed of suckling pig particles. (4) pay attention to the supplement of hematopoietic elements such as iron, diamond, copper and so on. The piglets can be fed with glucose-iron-cobalt injection or ferrous sulfate-copper sulfate solution within 4 days after birth. The specific method is: 3-day-old injection of dextran iron cobalt solution 1 ml, 10-day-old intramuscular injection 2 ml. Or 2.5g of ferrous sulfate and 1g of copper sulfate are dissolved in 1000 ml of hot water, filtered and given orally to piglets, which can be dripped into the mouth of piglets with an eyedropper, 10 ml twice a day at the age of 3, 5, 7, 10 and 15 days.

5. Piglets are weaned at the right time. Generally speaking, the longer the lactation time, the greater the weaning weight of piglets, but too long lactation time will reduce the annual litter size of sows. At present, most of the weaning days are 35 days old.