What to Do If a Sow Does Not Come Into Heat? Detailed Explanation of Treatment Methods

A pig is a treasure from head to tail, and market demand is large. Pig farming is a skill; only by taking good care of the pigs in the pen can you obtain high-quality products. The estrus status of sows is related to the development of the herd, and during the breeding process, you will always encounter some sows that do not come into heat. What is the reason for this? What are the treatment methods for sows not coming into heat?

I. Causes of sows not coming into heat

1. Congenital factors such as physiological defects and genetic defects, such as underdeveloped reproductive organs, hermaphroditic pigs, abnormal hormone secretion, etc. In addition, the presence of inferior seasonal breeding genes may also cause seasonal anestrus in sows.

2. Anestrus caused by some infectious diseases or gynecological diseases, such as swine eperythrozoonosis, porcine reproductive and respiratory syndrome, porcine pseudorabies, swine brucellosis, Japanese encephalitis, parvovirus, chlamydia and some other diseases, can all lead to poor reproductive development in pigs, resulting in pigs not coming into heat or showing unclear estrus, thereby causing reproductive disorders.

3. Sows that are too thin and cannot keep up with nutrition do not come into heat. Insufficient vitamins and trace elements in the feed of replacement gilts, or the presence of mycotoxins in the feed, can all cause sows not to come into heat.

4. Excessive nutrition makes sows too fat, with fat infiltration in the ovaries and degeneration of follicular epithelial fat cells, causing follicular atrophy or ovarian cysts, which can also lead to sows not coming into heat.

5. Weaning sows too late, with lactation weight loss of more than 15kg, leads to poor body condition, causing delayed estrus or anestrus after weaning.

II. Treatment methods for sows not coming into heat

Choose treatment methods according to the causes of sows not coming into heat.

1. Replacement gilts with congenital poor development should be culled first.

2. For sows with delayed estrus, drive a boar into the sow pen and let it mount and sniff the sow to stimulate estrus. This is beneficial for the sow's estrus, but each session should be controlled to no more than 15-20 minutes.

3. After morning feeding, massage the udder of sows not coming into heat in back-and-forth circular motions, about 10 minutes each day, and results can be seen after 1 week.

4. For sows that are too fat, simply feed 2/3 of the usual amount; after 4-7 days of semi-starvation treatment, increase the feeding amount, and after another 4-5 days of feeding, estrus can be promoted.

5. Use food or drugs to promote estrus. Place 0.15-0.5kg of brown sugar in a pot and boil it until melted, then decoct in 500-1000ml of water and mix into the feed, feeding the mixture for 5-7 days, 2 times a day. Equine serum gonadotropin, chorionic gonadotropin and similar drugs can also be used, strictly following the instructions for injection or feeding.

6. For sows in good body condition that do not come into heat, drive them out of the pen for exercise twice a day, with each session controlled to about 1 hour.

7. For anestrus caused by disease, treatment should first be based on the condition to restore the sow's health.

The treatment methods for sows not coming into heat are briefly introduced here. Of course, these are only some of the methods, and everyone can choose according to the actual situation.