At present, the majority of sow households in China use piglets weaned at 45 to 60 days of age, and the sows have an average of 1.5 litters per year. Practice has proved that adopting appropriate measures can enable sows to produce 5 litters for two years, so that each sow can produce 5 to 10 more litters per year, and the effect of increasing income is very obvious. First, the theoretical basis The sow's gestation period is 114 days. If the sow is estrus and mated within 40 days of the farrowing, then one sow’s production cycle is 154 days, two production cycles in one year will take 308 days, and four litter piglets will produce a total of 114 days in two years. Wo piglets, that is, nearly 5 litters for two years. Practice has proved that whenever weaned piglets are weaned, we only need to adopt the hunger method to reduce the supply of feed when the sow is weaned. The sow can be estrus within 1 week after giving birth. Sows need 5 to 10 days from weaning to estrous breeding, and the pregnancy rate can reach 100%. If the piglet is weaned at 30 days of age, the sow can be estrus and estrus after 37 days. Second, the application method Piglets early weaning is the main method to increase the number of litters in sows. At present, pig-raising countries have advocated piglets weaning at 21 to 35 days of age. According to China's actual situation (pig, feed conditions, etc.), weaning pigs 30 to 40 days of age is more appropriate. There are three ways to promote sows during lactation: First, weaning manually, that is artificially controlling and extending the interval between suckling the piglets, letting the piglets only eat 1~2 times of milk during the day, and letting the mothers together at night. Due to the long interval between piglet feedings, large amounts of milk accumulate in the sows' udders, causing the sows to swell, limiting the secretion of oxytocin. The reduction of oxytocin in the blood helps to increase the secretion of follicle-stimulating hormone in sows, which in turn enables sows to heat and ovulate as soon as possible. The second is the use of boars. For pig farmers who feed boars, the boars can be rushed to the sow's sports ground during artificial weaning, each time 15 to 20 minutes, once a day, generally continuous seizures 3 to 4 days after the sow You can heat up. The third is the injection of pregnant horse serum gonadotropin. The injection of 2000 international units of pregnant horse serum gonadotropin to lactating sows that are 18 to 32 days after farrowing, and two artificial inseminations on the 4th and 5th days after the injection, can make the pregnancy rate of lactating sows. Up to 70%.
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