How to improve sow reproduction

The production capacity is expressed as the number of litters per year and the average number of weaned piglets per litter. The length of sow breeding cycle determines the number of litters per year, and the number of litter-born pigs and pre-weaning mortality determine the number of weaned litters. Raising the productivity of sows is mainly to increase the reproductive cycle of sows and the number of weaned live piglets.

In large-scale household breeding production, most of the mothers of commercial pigs use hybrid sows, because hybrid sows have heterosis in reproductive performance and are suitable for the market demand for lean-type pigs. When selecting a stocking gilt for growth, the sows should be flat or slightly inclined, the abdomen is relatively large and loose, and the sows whose abdomen is excessively constricted have poor fertility. The nipples are arranged neatly and evenly, generally more than 7 pairs, and the nipples are full. There can be no steamed bread, no nipples, etc. The genitalia is moderate in size, sagging, and the sow's upturned sows are generally poor in reproductive performance, and often have sympathetic or non-pregnant phenomena. The maternal reproductive performance is better if it is not fat, nor normal, and sows with too high lean meat have poor reproductive performance. In the three-way hybrid system, no lean meat percentage is required for the female parent.

Growers or grown-up gilts usually have a body weight of 110-115 kilograms, which is more or less than the body weight. The gilts usually have an interval of 36 to 40 hours from the apparent estrus to ovulation, 38 to 44 hours of sows, and an average of 2 to 7 hours of ovulation. Therefore, the first time from 8 to 12 hours after the start of estrus The compounding at 12 hours intervals can achieve good results. Sows with indistinct estrus need to be reconstituted twice. After the weaning, the sows are usually estrus within 3 to 10 days. The sows after pregnancy should be given controlled feeding. Maintaining the medium feeding can increase the number of litters in the litter.

Under normal production conditions, some sows do not have estrus for a long period of time or frequent regrowth. Sows who use drugs for aphrodisiac and improve feeding management or return more than 3 times should be eliminated in time. Sows generally have the highest number of 3 to 6 litters and are reduced to 9 to 10 litters, with significant differences in performance. This sow should be eliminated in time. Poor nursing performance or postpartum sow-free sows should be documented and should be phased out if similar conditions occur in the future.

The sow should control the amount of feed after pregnancy, generally feeding 1.6 to 1.8 kg per day within 30 days of pregnancy, 2.1 to 2.3 kg per day for 30 to 60 days, and 2.5 to 2.8 kg per day for 60 to 108 days. 7 days gradually reduced until 1.2 kilograms per day, for individual thin, partial sows should be appropriately reduced material, the standard status of pregnant sows is the upper middle. For pregnant sows raised in large groups on the same column, midwives should not be co-opted to avoid crowding and fighting, and disinfection must be done to eliminate epidemics.

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