What if the sow is not in estrus? how to make the sow in estrus?

The reason why sows are not in estrus is more complicated, like people, there must be a reason, generally the main reason is that feeding and management is not done well, followed by disease, there may be some other factors. The following is a brief summary of the reasons for sows' lack of estrus and how we should deal with it in the process of breeding.

What if the sow is not in estrus?

First, congenital factors: mainly physiological defects and genetic defects, such as imperfect development of reproductive organs, bisexual pigs, abnormal secretion of hormones and so on. In addition, the presence of seasonal reproductive inferiority genes may also cause seasonal sows not to be in estrus.

Second, infectious diseases: porcine eperythrozoonosis, porcine reproductive and respiratory syndrome, porcine pseudorabies, porcine brucellosis, Japanese encephalitis, small, chlamydia and other diseases can lead to reproductive dysplasia in pigs, so that pigs do not have estrus or estrus is not obvious, resulting in reproductive disorders.

Third, poor feeding and management: non-estrus in sows accounts for a large proportion, mainly due to the following reasons:

1. Nutrition: due to malnutrition, sows are too thin to be in estrus; feeding a single variety of feed results in malnutrition and non-estrus in sows. The lack of vitamins and trace elements in the feed of reserve sows or the presence of mycotoxins in the feed can cause sows not to be in estrus. Excessive nutrition, so that sows raised overfat, ovarian fat infiltration, follicular epithelial adipocyte degeneration, resulting in follicular atrophy or ovarian cysts, can also lead to sows not in estrus.

2. When sows are weaned too late, the weight loss of sows in lactation is higher than 15kg, which leads to poor physical condition and delayed estrus or non-estrus after weaning.

Fourth, sows' obstetrical diseases (such as endometritis) can also cause non-estrus.

How to make sows in estrus

The mechanism of abnormal estrus in sows is mainly due to the imbalance of hormone secretion in the body. all methods are to improve hormone secretion in rest, especially sex hormone secretion.

1. Control the fat condition: if you are too fat, you should limit your feeding to make it lose weight, and then urge you to do so; for those who are too thin, increase the amount of feed to fatten them.

2. Boar reminder: put the non-estrus sow and the boar together, let the boar chase, climb across to promote the sow estrus.

3. Migration reminder: when approaching the age of first estrus, the pigs bred in the house should be moved to another environment.

4. Herd reminder: the reserve sows were raised in small herds, 10 / 20 in each column, and 6 / 8 in each column after weaning.

5. Exercise reminder: strengthen sow exercise, implement grazing and grazing, which is helpful to promote sow estrus.

6, drug aphrodisiac: injection of pregnant horse serum gonadotropin, human chorionic gonadotropin. Or injection of triad hormone, can make sows estrus ovulation.

7. Massage the breast: massage the breast by hand, once or twice a day for about 10 minutes each time for 5-6 days, the sow can be in estrus.

8. Brown sugar reminder: Brown sugar 0.5ml 1kg, stir-fry in an iron pan, then add 1.52kg of water to boil, cool and mix the feed to feed the pig. After 3-5 days, the sow that has not been in estrus for a long time begins oestrus.

9. Careful observation: some good breeds of pigs, especially purebred pigs, are not in estrus, and may be ignored if they are not paid attention to.

How can sows come into estrus quickly

Sows are in estrus because of the growth, development and physique of each pig, so it is unrealistic to say that you want to let the sows come into estrus quickly, because it takes some time for the physical signs of the reserve sows to mature. But there is a way for sows to have a smooth estrus (for parturient sows only). Within a week after giving birth to piglets, healthy sows without other diseases generally have a smooth natural estrus. If you are not in estrus for more than a week, you should be given medicine or injection (for example, because of inflammation, you should first carry out anti-inflammatory treatment and then be fed with estrus powder. If you are lack of vitamin E and do not have estrus, you can inject vitamin E-the so-called tocopherol). If there is no inflammation, you can also inject vitamin E: increase litter size and effectively prevent the occurrence of non-milk disease! Before sow breeding, an injection of anti-inflammatory drugs on the same day can effectively prevent inflammation and improve the pregnancy rate.

How to promote ovulation in sows

1. Even if the sow is in normal estrus, sometimes it may not match, mainly because the sow does not ovulate. Drugs are often needed to promote ovulation in sows. In general, if sows do not ovulate, they can choose to use drugs to promote ovulation for intramuscular injection, which can generally have an effect.

2. But it should be noted that it is best not to use drugs to promote ovulation in sows, especially in parturient sows. Once drug dependence is formed, it is likely to affect future estrus and pregnancy. For newborn sows, you can choose to replenish the light in the sow house at night, because the light can stimulate the ovary function of the sow to a certain extent, which can also promote ovulation.

The above are introduced by Xiaobian, many factors will cause sows not to be in estrus; sows are the engine of pig farms, so pig friends must be extra careful in their daily management work, do a good job in disease prevention, and reduce some unnecessary losses.