Ways to make sows more productive

Sow prolific spasm can improve the economic benefits of breeding. Here are some ways to make sows more productive than for reference.
1. Control the temperature of the pig house. According to data reports, the general temperature for grazing sows is 17 to 20°C, and the suitable temperature for pregnant sows is 11 to 15°C. Temperatures that are too high or too low are not conducive to the development of fertilized eggs and the attachment of embryos.
2. Control fetal times. Generally, the number of first births is low, and the second child begins to gradually increase. The number of childbirths from the 4th to the 6th child is the highest, and then it gradually declines, and the 8th child begins to fall below the average.
3. Scientific feeding. In order for the sow to develop normally, it is beneficial to fertilize the breeding and increase the number of calving. The sow should be fed more green and juicy feed during the empty period so that the sow can maintain a medium sensation. The principle of scientific feeding is: too fat sows, less feed concentrate, more green and juicy feed; too thin sows, should strengthen feeding and management, feed more concentrate and animal feed, so that the sows as soon as possible Rehabilitation.
4. The best breeding time. Timely breeding can obtain higher litter production. Premature or late breeding will lose some eggs and reduce the number of calving. The appropriate breeding time is: the second day after the earth breeder starts estrus; the hybrid sow is on the afternoon of the second day or the third day after the estrus; the exotic sow is waiting on the second day after the estrus begins. The redness of the vulva of the sow has just begun to subside, and a filiform mucus has flowed out (a folk hanging line). When the sow's hindquarters stand still, it is the best breeding time. The masses’ experience is: “If it counts, two days and a half,” “the old match is early, the match is late, and the old is not small with the middle”.
5. Boar semen quality. The boar's diet has digestible energy ≤ 13 MJ/kg, digestible crude protein ≤ 14%, calcium 0.7%, phosphorus 0.6%, daily feed volume 2.5 to 3.0 kg. Exercise 1 hour each morning and afternoon. The boar is of a sturdy physique, superior in sensation, strong in libido, good quality in semen volume, strong fertilization ability, high conception rate of sows, and more pupas.
6. Scientific use of boars. Adult boars can be used 3 to 5 times a week, and young boars are used 2 to 3 times a week to avoid overuse and abstinence. For seasonal mating and seasonal calving pig farms, boars should be examined for semen quality before use, and eligible for mating.
7. Choose sows that have a lot of nipples. It has been reported that sows with a large number of nipples usually have more calving, so when selecting sows, remember to select multiple nipple sows.
8. Feed sows with carotene and vitamin E. It has been reported that by adding a certain proportion of carotene and vitamin E to the dietary feed of sows, the number of calves produced can be increased by 21.9%, as follows: From the third day after weaning, the feed of each sow Vitamin E 200 milligrams and carotene 400 milligrams were added daily, and sows were halved after estrus, until 21 days after pregnancy.
9. Inject the dead sperm into the primiparous sows. Before the primiparous sow begins oestrus and normal insemination, it is given an appropriate amount of dead semen, and each sow can produce 1.3 more piglets.
10. Increase the daily feed amount. According to reports, the daily feeding amount of the sow is increased within 10 to 14 days before the breeding, which can stimulate the sows to ovulate more than 2 eggs, and one piglet can be produced at the time of farrowing.
11. Feed the potatoes. It has been reported that four and a half kilograms of raw potatoes are fed each day for 1.5 to 2 months prior to sow mating, thus allowing 1.4 piglets to be produced.
12. Baotai. Sows are susceptible to miscarriage after 9-13 days of mating and before the 21st day of childbirth. Attention should be paid to the use of high-protein feeds, minerals, and vitamin-rich concentrates and green feeds. Avoid feeding frozen, rotten, spoiled feeds. Crowding, biting, slipping, whipping, scaring, etc.
13. Early weaning. Early weaning of piglets results in early estrus and early mating of sows, shortening the reproductive cycle of sows and increasing the number of sows to be born each year. The weaning sow is more suitable for weaning from 21 to 28 days after calving. At this time, the adverse stress of the piglet is less than that of the sows and the next litter. Weaning time for young sows is about 35 days.
14. Injection promotes row 2. Sows are ovulated for about 20 within one estrus period and have an ovulation duration of 10 to 15 hours. Treating sows with LR4-A2 can promote egg maturation and intensive ovulation, increase conception rates, and increase the number of calving.
15. Elimination of unqualified sows. Long-term estrus, fake estrus or repeated infertility and fewer calving sows should be eliminated in time.
16. Use of heterosis. Native female pigs or hybrids are used as female parents. Crossbred males (eg Yorkshire, Landrace, Duroc, etc.) are used as male parents for crossbreeding. The number of calves produced can be increased by 20% to 30%.
17. Reduce embryonic death. After sow pregnancy, the embryo has three death peaks. First, in the 13 to 18 days of pregnancy, the embryo quickly changes from round to long and begins to implant in the uterus. At this time, if the nutritional deficiency or nutrient metabolism is not perfect, the embryo mortality is the highest; the second is the embryonic organ formation stage in the third week of pregnancy. Because the embryos compete for the nutrients they need for growth and development in the placenta, the loss will be stronger and weaker. Third, 60 to 70 days of pregnancy, the fetus will grow rapidly, resulting in death due to the shortage of nutrients. In order to reduce the death of embryos and increase the number of calves, it is necessary to increase the sow's pre-pregnancy nutrition.
18. Make up for chromium. The sows began to supplement chromium at the time of breeding, and the first, second and third litters could produce 0.4, 0.8, and 2 more respectively. Chromium supplementation in primiparous sows can reduce miscarriage, reduce mortality, and increase calving.
Author: Institute of Animal Husbandry, Chinese Academy of Agricultural Sciences

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