The reason why sows are not in estrus

In general, sows can be in estrus normally when they are raised from July to August, but some sows are over 9 months old and have no estrus even when their weight is more than 140 kilograms, and weaning sows do not have estrus for more than a month. Sows are not in estrus and cannot be mated normally, which seriously affects the efficiency of breeding. So what is the reason why sows are not in estrus? Let's get to know it.

1. Reasons for non-estrus

What are the reasons for sows not to be in estrus? most of them are caused by improper feeding management, poor growth and diseases, especially in rural areas, many farmers do not control sows properly, which often leads to sows being too fat and too thin. it will cause it to delay estrus. In addition, too high or too low temperature and humidity in the pig house will also affect the oestrus of sows, which will inhibit the gonadal development of sows during the period of high temperature, while the reserve sows of weight and age that have reached the age of estrus have not been induced by boars. It will also cause him not to be in estrus.

2. Methods of aphrodisiac

There are many ways to induce oestrus to sows. The common way is to induce boars. Sows without estrus are raised in the same house, so that boars can chase and crawl, and the smell of boars will stimulate the pituitary gland of sows, promote gonadal development, promote oestrus, or play a recording of boar courtship. It can also be raised in groups of sows in estrus and non-estrus sows, which will also stimulate their estrus, or appropriately strengthen the amount of exercise of sows and carry out grazing to create a suitable environment for promoting oestrus.

3. Medication

In addition to the above means of oestrus, drugs can also be used to inject 5 ml of pregnant horse serum gonadotropin into sows and 1000 units of chorionic gonadotropin into the muscles of sows weighing 75-100kg, which can promote their estrus and ovulation with better results. Traditional Chinese medicine can also promote its estrus, can use dodder 100 grams of fried water 250 can, add feed, 1-2 times a day, 2-3 days in a row, or with Tongcao, papaya, magnolia and other traditional Chinese medicine decoction water feeding.

4. Handling principle

For non-estrus sows, first of all, improve its feeding and management, according to the reasons for its non-estrus, carry out a variety of prevention and control measures, so as to achieve good results, and for sows that have not been in estrus after taking measures, they should be eliminated in time, or listed and sold as fattening pigs so as not to expand economic losses.

The above is the introduction of the reasons why sows are not in estrus. I hope I can help you. If you want to know more about it, please pay attention to us.