Fertility is the ability of the pig to maintain normal reproductive function and to give birth to offspring. The fertility of male pigs is directly related to the libido, semen quality and sperm viability of the male pigs, while the fecundity of male pigs is mainly related to the fetus rate, litter size and survival rate.
First, the representation of fertility
1, conception rate. The conception rate refers to the ratio of the number of fetuses bred in one estrus period to the number of females participating in mating.
2, reproduction rate. The reproduction rate refers to the ratio of the number of newly born piglets in the current year to the number of end-to-end multiplication mother pigs in the previous year, reflecting the proliferation efficiency of the sow herds.
3, survival rate. The survival rate generally refers to the survival rate of juvenile weaning, that is, the ratio of surviving piglets at the time of weaning to the total number of live piglets at birth, or the ratio of the number of live piglets in the current year to the number of piglets born in the current year.
Second, reproductive barriers cause a wide range of obstacles in the breeding of pigs, there are genetic factors, there are acquired diseases, so that the pig can not reproduce or reproduce affected.
1, mother pig. Infertility caused by female pigs is mostly caused by ovarian disorders, the most common is the persistent corpus luteum, as well as ovarian unilateral or bilateral follicles and corpus luteum cysts, so that the female porcine estrus interference.
2, male pig. Most of the male infertility caused by the penis is penile defects and testicular unhealthy. Such as cryptorchidism, although the public fragrant pigs also show sexual desire and complete sexual behavior, but no sperm production, such a public fragrant pigs should be treated in time, those who are ineffective treatment should be eliminated.
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