To increase the sow's fertility from which to start?
Sow fertility includes a range of physiological phenomena such as ovulation, fertilization, embryonic development and pregnancy examination. At present, it is difficult for pig producers to determine which of the above mentioned physiological factors is most important in order to increase sow fertility. One of the ways to solve this problem is to identify various factors that affect sow fertility and focus on the room for improvement. Modern Genetic Theory Breeding Most newline sows usually have 16-20 eggs per estrus. Since few litters have the same number of litters and ovulations, it is impossible for sows to limit the number of ovulated eggs. Similarly, if insemination is performed 24 hours before ovulation, the fertilization rate of the egg is also high - more than 90%. If the fertilization rate is not ideal, it is usually caused by inconsistent breeding time and ovulation time. Therefore, one of the factors affecting sow fertility is not the genetic aspect, but the timing and frequency of breeding. In contrast to ovulation and fertilization, the development of early embryos in pigs can easily fail despite ideal management conditions. It is estimated that only 55-60% of the fertilized eggs can develop to the end. Most of the early-dead embryos occur within 30 days after mating. Therefore, the following discussion of sow fertility problems mainly focuses on breeding methods and the management of sows in early pregnancy. New ideas.
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