Methods to improve the reproductive ability of sows

The production capacity is the litter size per litter and the litter size per litter, the litter size is determined by the length of the sow reproductive cycle, and the litter size is determined by the litter size and pre-weaning mortality. The main way to improve the production capacity of sows is to increase the reproductive cycle of sows and the number of live weaned piglets.

In large-scale household production, most of the mothers of commercial pigs use hybrid sows, because hybrid sows have heterosis in reproductive performance and meet the needs of the market for lean pigs. When choosing grown-up reserve sows, the body should be straight or slightly tilted, the abdomen should be large and loose, and the fecundity of the sows with excessive abdominal contraction should be poor. Nipples are arranged neatly and evenly, generally more than 7 pairs, nipples are full, can not have blind head, accessory nipple and so on. The reproductive performance of sows with moderate and drooping vulva and upwarped vulva is generally poor, and there is often the phenomenon of regurgitation or non-conception. The maternal reproductive performance of the normal condition that is not fat or thin is better, while the sows with high lean meat percentage are poor in reproductive performance. In the three-way hybrid system, the lean percentage of the female parent is not required.

It is generally appropriate to grow up or grow into reserve sows with a body weight of 110kg to 115kg. Higher or lower weight has an effect on litter size. The interval between oestrus and ovulation in reserve sows is generally 36-40 hours, and that in post-parturient sows is 38-44 hours, and the average ovulation time is 2-7 hours, so good results can be achieved by mating for the first time in 8-12 hours after estrus and 12 hours apart. It is necessary for sows that are not in estrus to make a second recombination. Sows are generally in estrus within 3 to 10 days after weaning. Sows after pregnancy should be fed at a controlled amount. Keeping a moderate feeding amount can increase the litter size.

Under the normal production state, there are some sows that have not been in estrus for a long time or return frequently, so the sows that are ineffective in using drugs to promote estrus and improve feeding and management, or return more than 3 times, should be eliminated in time. In general, the litter size of sows was the highest at 3-6 and decreased at 9-10, and the litter-bearing performance of sows was significantly different. This kind of sow should be eliminated in time. Sows with poor lactation performance or no milk after delivery should be recorded and eliminated if similar situations occur in the future.

The feed amount of sows should be controlled after pregnancy. Generally, the sows are fed 1.6-1.8 kg per day within 30 days of pregnancy, 2.1-2.3 kg per day for 30-day pregnancy, 2.5-2.8 kg per day for 60-day pregnancy, and gradually reduced until 1.2 kg per day for the last 7 days. for individual thin and obese sows should be properly reduced, the standard condition of pregnant sows is above-average. For large groups of pregnant sows raised in the same column should not be halfway and column, so as to avoid squeezing, fighting and other stimulation, usually to do a good job of epidemic prevention and disinfection to eliminate internal and external parasites.