Scientific management allows sows to prolific breeding
How to make sows prolific, produce and grow, and reduce the cost of weaned piglets, and promote the healthy growth of the mother is a key management technology to improve the efficiency of sow breeding. Adjusting the gestational age structure In general, the reproductive performance of 3-6 parity sows is in the best period. In order to ensure the reproductive performance of sows, sows at this stage of gestational age should be maintained at about 60%, first- and second-born sows should be maintained at 30% to 35%, and sows above 7-nine should be maintained at 5 % to 10%. Select gilt gilts should be selected for retention one month prior to breeding, by selecting their reproductive performance in combination with their family's reproductive performance, with more teats and no abnormalities, and with large and normal udders and vulvae, and open hind legs. (preferably the two tiers of nipples are spaced at a larger distance), sows with 3 pairs of teats in front of the umbilicus. After the sow is selected and kept, it should be properly restricted to keep it from being over-fat or too thin (2.5 to 3 grades that meet the US 5-grade criteria, ie, the vertebrae and ribs cannot be seen, but the ribs are not touched by the ribs). Feeding should be started 2 weeks before the replacement of gilts and 2 to 2.5 kg per day. The crude protein level of the feed should be around 16%, and the supply of minerals and vitamins should be sufficient. Select the timing of weaning In order to prevent the occurrence of mastitis, we should gradually reduce the material from the three days before the sow weaning to about 2 kg per day. After sow weaning, in order to promote its estrus and increase the number of ovulation, high quality feed (crude protein content ≥ 16%, metabolic energy content ≥ 3.1 megacal/kg, lysine content ≥ 0.8%) should be fed. According to its sensation, it increased to 2.3-2.6 kg per day. Generally, two breedings are reserved for sows during pregnancy, and low-energy and low-protein feeds (crude protein content ≤14% and metabolisable energy content 3 to 3.1 trillion) should be supplied within 3 weeks from the second day of second breeding to the third week after mating. Card / kg), the daily feeding amount of 1.5 to 2 kg, so as not to affect the excessive intake of progesterone secretion, thereby increasing embryo death and reducing litter size. Low-energy, low-protein diets should continue to be available from the fourth to the 80th day of sow pregnancy, but 0.3 to 0.5 kg of feed should be added before the start of pregnancy. This stage must ensure that the sow's appropriate lyrical condition, the best control to the United States 5 grades of 2.5 to 3, if not easy to grasp, do not even fat. Overfeeding during pregnancy can lead to anorexia during sow lactation, and there is no secretion (less secretion) or too much weight loss, affecting fecundity of subsequent parity. In order to ensure the rapid growth of the fetus and increase the birth weight and health level of the piglets, the high-energy and high-protein feeds should be fed from the 80th day of sow pregnancy to the farrowing, and the daily feeding amount is generally 2.3 to 2.8 kg. Deworming is carried out two weeks before the sow is born, and the body is disinfected one week before delivery and transferred to a farrowing house (bed).