What if sows don't go into estrus after weaning?

Normally, sows are in estrus about a week after weaning. But many farmers reflect that they are not in estrus for ten or twenty days after weaning. Why? What are we going to do?

What if the sow does not go into estrus after weaning?

First of all, it is necessary to strengthen feeding, choose full-price materials for lactating sows and feed them 3-4 times a day to ensure that there will not be too much weightlessness during weaning; secondly, it is necessary to ensure the ventilation of the pigsty and cool down in summer. In addition, non-estrus sows can also be intramuscularly injected with appropriate doses of diethylstilbestrol, anterior pituitary gonadotropin, chloroprostol and so on.

What is the reason for sows not to be in estrus after weaning?

1. The first mating age of young sows is too early.

For young sows just entering puberty, although their genitals have normal reproductive function, early mating and conception of young sows will not only lead to fewer births, small birth weight, small weaning weight and low survival rate of piglets, but also affect the weight gain of sows themselves.

two。 Sows lose too much weight during weaning

Under normal circumstances, when sows go through a lactation period, their body weight decreases in varying degrees, and the proportion of general weightlessness is about 25%, which does not affect the normal estrus breeding of sows after weaning, but if the diet is deficient in nutrition and large milk production, with too many piglets, the sows will lose weight abnormally during weaning, and the weight loss will be larger than 60 kilograms, and the estrus mating of sows will be significantly delayed after weaning.

3. Seasonal influence

Sows are multi-cycle estrus livestock, can be perennial estrus breeding? However, in the hot summer season (June-September), seven days after weaning, the estrus rate of sows is 20% lower than that of other seasons, especially in parturient sows.

4. Sow fat

During the lactation period of some sows, the lactation is low and the number of piglets is small; some pig farms are fed with high-protein and high-energy diets, which are not limited for a long time, until they do not lose weight when they are weaned, and a large amount of fat is deposited in the body, resulting in excessive obesity, resulting in the cessation of follicular development in sows and the failure of normal natural estrus breeding.

5. Abnormal endocrine secretion

Sows have damage to the birth canal, contamination, retention of placenta or remnants of fetuses and fragments, lochia when the uterus is relaxed, operation during dystocia, incomplete disinfection during artificial insemination, inflammatory secretions in boar reproductive organs or semen during breeding, or inflammation in the reproductive system of sows caused by brucellosis or other microbial infection.

6. The use of materials is not scientific

Some pig farms do not use sow special feed, but choose growing and finishing pig feed to feed sows, although the feeding cost is lower, but a little longer feeding time may bring great harm.