What if the reserve sow doesn't go into estrus?

Sows must be constantly updated in pig production, that is, while eliminating sows with slow estrus, old and frail, poor lactation ability and reproductive disorders, high-quality reserve sows are selected in time to supplement production. In fact, the so-called reserve sows refer to the sows left for breeding before the first breeding. Let's take a look at what to do if the reserve sows are not in estrus.

The reasons for the non-estrus of reserve sows

1. A variety of stress responses: for sows, too many stressors will lead to non-estrus, and common stressors such as immune times and high temperature can easily lead to non-estrus in reserve sows.

2. causes of pig diseases: pig diseases can also lead to non-estrus in reserve sows, such as porcine reproductive and respiratory syndrome, endometritis, circovirus disease and so on.

3. Nutritional factors imbalance: if the reserve sows are lack of protein and ability during the breeding period, it is easy to cause the reserve sows not to be in estrus, and some other nutritional factors imbalance will also affect the reserve sows.

4. Error in feeding and management: the reserve sows are suitable for raising in groups in large pens. 4-6 sows in each column are more favorable for proper climbing among sows to promote estrus, too few sows lack exercise, and too many sows will make the pens overcrowded and fight.

What if the reserve sow doesn't go into estrus?

1. Change the pigsty: transfer the non-estrus reserve sows from the original pigsty to another pigsty, and at the same time make them group with the parturient sows of similar size after weaning, and wait until the parturient sows climb across the reserve sows after oestrus to promote their oestrus.

2. Increase exercise: drive the non-estrous sows to the hillside for a ride, or load them into a van for a "ride". When they come back, sometimes the reserve sows will be in estrus.

3. Boar stimulation: when the reserve sow is about 180 days old, the first estrus induction can greatly reduce the probability that the reserve sow will not be in estrus. Generally, the non-estrus reserve sow will contact the boar once or twice a day, and a boar will be seduced in 2-3 days.

4. Hormone therapy: back-up sows without estrus can use hormone therapy, combined with pregnant horse serum and human chorionic gonadotropin, generally used up to three times, if the effect is not obvious, it should be abandoned.

5. Choose elimination: some reserve sows are in beautiful shape, but after trying various methods, they are still disappointing. It is suggested that we should choose elimination at this time, because some reserve sows are not in estrus due to the defects of the pigs themselves.

Feeding and management techniques of reserve sows

1. Introduction isolation: the reserve sows cannot be mixed with their own pigs immediately after introduction. Under the premise that the test results are normal, they will be isolated for about 1.5 months (at least 30 days), and then mixed with the basic vaccine.

2. Feeding and management: the reserve sow can be fed freely before 80kg, but the individual who are too fat or too thin should be properly restricted or fed, and when the weight reaches 80kg, the fat condition should be strictly controlled so as not to affect the normal estrus and breeding.

3. Vaccine injection: back-up sow vaccine injection is the key to achieve good results in future production, vaccine injection is different from each feeding farm, but the best way is to operate according to the rules provided by the feeding farm, and the continuity is relatively strong.

4. Daily exercise: reserve sows must strengthen exercise before breeding. Proper exercise every day can reduce the occurrence of limb diseases, increase appetite and promote estrus.

5. Timely breeding: before breeding, managers should pay close attention to observe the time of their first estrus, and make detailed records for reference in real breeding, and the first estrus should also be recorded.

6. Mating methods: at present, there are mainly two types of mating methods: natural mating and artificial insemination. It is best to use natural mating at the beginning of breeding, that is, reserve sows with stable estrus and boars with exuberant libido are rushed to the breeding pen to mate.