The study found that almost all vitamins have a large effect on the reproductive performance of breeding pigs.
vitamin A
Vitamin A also participates in ovarian development, follicle maturation, luteum formation, improvement of fallopian tube epithelial cell function and embryonic development in sows. When vitamin A is lacking, the reproductive system epithelium is most severely affected, and the epithelial cells of the reproductive system and other tissues undergo squamous cuticular changes, causing inflammation and reducing the immunity of animals. When the boar lacks vitamin A, the symptoms of gao pill reduction, functional degradation, reduced semen quality and other symptoms. Studies have shown that the reproductive performance of breeding sows can be well improved by supplementing them with vitamin A.
Vitamin D: Vitamin D promotes the absorption of calcium and phosphorus, regulates calcium and phosphorus metabolism and bone formation, and is an essential vitamin for sows to maintain pregnancy and lactation. When vitamin D is insufficient, it will lead to reduced fertility, ovarian atrophy, uterine relaxation, and an arrhythmic cycle (no ovulatory cycle), resulting in multiple ineffective vacancies. Even with fertilization, the fertilization rate is very low, and the zygote dies early in development. Vitamin D deficiency during pregnancy can prolong pregnancy. Excessive deficiency will cause congenital bone deformity in newborn piglets, and the sow bones will also be affected.
vitamin E
Vitamin E is closely related to its reproductive function. Vitamin E supplementation in sow diet can not only increase the conception rate and increase the number of litter size, but also enhance the stress resistance of piglets, reduce the death of piglets before weaning, and shorten the interval between weaning and estrus of sows.
VE by stimulating the anterior pituitary activity, is the gonadotropin secretion increase, regulatory function, can promote ovarian function, is the increase of ovarian luteal cells. When sows lack, ovarian function decreased, sexual cycle was abnormal, unable to fertilize, abnormal embryo development or stillbirth. Studies have shown that vitamin E during pregnancy increases litter size.
folic acid
Folic acid plays an important role in maintaining reproductive performance and promoting early embryonic development in sows. In maintaining the stable reproductive function of sows, it can improve the litter number, maintain good lactation force and prevent lactation disorder.
vitamin C
After feeding vitamin C, the sperm quality of boars improved, while the conception rate of sows increased. Especially in summer high temperature or sows experience environmental or physiological stress before and after delivery, vitamin C has strong anti-stress effect, which can improve the reproductive performance of sows by alleviating stress.
Vitamin B2 (riboflavin)
We showed that feeding 100 mg / day riboflavin increased the number of viable embryos, embryo survival, litter rate and viable litter size 47 days after mating. Studies have confirmed that 90 to 100 mg / day riboflavin supplementation in early pregnancy significantly increased the litter rate.
vitamin K
The addition of 100 mg / kg vitamin K to the diet of pregnant sows can increase the litter number by 5.66%, and the addition of 100 mg / kg vitamin K to the diet of lactating sows can increase the weight of piglets by 7.78% and the survival rate of piglets by 3.81%.
Vitamin B6
Pregnant sows on a diet with 15 mg / kg vitamin B6 (1 mg / kg for controls) reduced the weaning to estrus interval by 1.1 days.
niacin
During pregnancy and lactation, 33 mg / kg niacin in the diet reduced the incidence of hysterectomy-mastitis-lackling syndrome by 30%.
biotin
The main function of biotin is to maintain the health of the breeding pig and prevent hoof cracking, breaking and paralysis. Biotin supplementation can reduce the incidence of limb hoof disease in sows, but also promote fetal growth and development, reduce fetal death and promote lactation, improve the ovulation number and conception rate of sows, and shorten the interval from weaning to estrus.