The cause of the long-term lack of sows

January 05, 2021

The number of non-pregnant and non-mammalized days for any production sow and replacement pig that exceeds the appropriate age (usually set at 230 days) is referred to as Non-Productive Vitamin E Days (NPD). There are 3-6 days of weaning to breeding intervals required, during which sows are prepared for estrus and can be called non-productive days.

Causes of non-productive days of sows

1, gilts over 230 days old, no estrus performance or short estrus time, oestrus is not obvious cause leakage, or due to nutritional discomfort, lack of essential vitamins, trace elements and improper management, the lack of heterosexual stimulation and the right amount of exercise Delayed the initial allocation time; pigs kept fat, resulting in non-estrus pigs, etc. will increase the number of non-production days of gilts.

2, weaned sows, due to good sensation, can not be heat within 3-7 days after weaning.

3. Sows who are infertile during a love period and who have delayed the return time will have an increase in non-productive days.

4. Aborted sows that have not been estrus for a long time, or estrus mating and not pregnant sows.

5, pregnant sows died during pregnancy, or because of disease eliminated sows. The sows that should have been eliminated had failed to be processed in time, which prolonged the feeding time and increased the number of breeding days for sows.

6, pregnancy miscarriage of justice. After 18-21 days of pregnancy test, the pregnant sows did not have the result of misjudgment, and the sow had no estrus performance. Long-term sow feeding increased the number of non-productive days of sows.


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