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How to make sows produce five litters for two years
At present, most sow breeders use piglets weaned at 45-60 days of age, and the sow averages 1.5 litters per year. Practice has shown that adopting appropriate measures can enable sows to produce 5 litters for two years, so that each sow can produce 5-10 pigs 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. It has been proved that whenever piglets are weaned, as long as the hunger method is adopted (that is, the amount of feed is reduced when the sow is weaned), the sows can be estrus within 1 week after farrowing. Sows from the weaning to estrous breeding need 5-10 days, pregnancy rate of up to 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 sows litter size, generally weaning 30-40 days of age weaning is more appropriate. There are three ways to promote sows during breast-feeding: First, weaning artificially, that is artificially controlling and extending the interval between suckling the piglets, letting the piglets only eat milk 1-2 times during the day and letting the mothers together at night. . Due to the elongated time interval between piglet feedings, large amounts of milk accumulate in the sow's breasts, causing sow breasts to expand, thus limiting the secretion of oxytocin, and the reduction of oxytocin in the blood helps to increase the sow's follicle stimulating hormone. Secretion, so as to promote sows as soon as heat and ovulation. 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 15-20 minutes, once a day, generally after continuous seduction 3-4 days after the sow You can heat up. The third is the injection of pregnant horse serum gonadotropin. A total of 2000 international units of pregnant horse serum gonadotropin were injected into lactating sows 18 days to 32 days after farrowing, and two artificial inseminations were performed on the 4th and 5th days after the injection, respectively, so that the pregnancy rate of lactating sows can be increased. Up to 70%.