How to increase the litter size of sows

Measures to improve litter size and lactation ability of sows

Scientific feeding and management. To create a suitable growth environment, sows should be bred at the right time to improve the conception rate; provide nutritionally balanced feed to control the fat condition of piglets, if the piglets are too fat, it will cause oestrus is not obvious, gestation difficulties; and sows after production milk is too thick, it is also easy to cause piglet indigestion. The key to increasing the number of piglets is to keep sows fat (80% fat) from mating to parturition. The diets of pregnant sows are fed with low energy levels, but high and low feeding methods should be adopted in order to make rational use of energy under the condition of low energy levels. Specific methods: from mating to about 30 days of pregnancy, a higher nutritional level was adopted, a low nutritional level was used in the second trimester, and a high nutritional level was given in the latter part of pregnancy.

Increase the milk yield of sows. The milk yield of sows is affected by many factors, such as parity, the number of suckling piglets, the age of sows and the conditions of feeding and management. The practice is to provide diet according to the lactation and physiological needs of sows, and to control lactation: 1. It is necessary to do a good job of cutting weight before and gradually increasing the weight after delivery. Prenatal diet reduction can reduce the gastrointestinal burden of sows during delivery, which is very beneficial to smooth delivery and normal lactation of sows. The gradual increase in postpartum feeding will promote the smooth recovery of the sow uterus and avoid diseases such as indigestion, puerperal fever and mastitis. two。 The feed quantity was adjusted according to the lactation curve. In general, the peak of lactation is from 15 days to 28 days after delivery, and decreases gradually after 30 days. The sow feed provided according to this law can exert the maximum lactation performance. In order to increase feed intake and shorten the fasting time of day and night, the feeding time was changed from 2 times to 3 times from the fifth day of delivery, from the eighth day to 4 times, and then back to 2 times on 55 days. That is, to adopt the feeding mode of low, high and low. Sows are fed four times a day to make them feel full and prevent them from standing up to arch grass or looking for food at night, which can reduce crushing and trampling on piglets, which is conducive to sows' quiet rest.

? Establishment of conditioned reflex for lactation and lactation

The practice shows that the number of lactation of sows is positively proportional to the amount of lactation, that is, the more times of milking, the higher the amount of lactation. Milking can be formed by establishing a conditioned reflex by using a signal (whistle, bell, or "tut-tut" from the breeder's mouth). During the normal lactation of sows, the breeders send this signal for many times of training, and the conditioned reflex can be formed. After the conditioned reflex is formed, the sows can be induced to release milk by giving the same signal stimulation. The use of milk release and milk feeding conditioned reflex can increase the milk release times of sows, thus increasing the milk yield of sows.