At present, there are widespread gilts in the pig farm that are susceptible to fetuses when they are first bred, and the normal estrus rate is low when they enter the second-cropping breed after weaning. After treatment, they do not receive satisfactory results. The elimination rate is as high as 30-40%, and even some farms will Higher, has brought serious economic losses to production.
Training a good gilt requires the breeder to spend a lot of energy and cost. However, the pig farms of many friends have been plagued by the high elimination rate of the first-born sows. It is a pity that we should eliminate them, and continuing to raise them without creating economic value will increase the cost. This is very helpless.
What is the reason why the first-born sow is not estrus after weaning?
Through the understanding of production, the first-born sows that are not estrus after weaning are often sows with more litters and are particularly lean at weaning. It is a pity that such sows are eliminated because they are not estrus.
Through the above situation, it can be clearly identified that the reason why the first sow is not estrus after weaning is that the body is consumed too much and it is difficult to recover in a short period of time. The follicle cannot develop normally due to lack of nutrition, and it is unable to normal estrus.
Why is the proportion of first-born sows higher than that of sows?
The reason is very simple, because the first sow individual is small, the gastrointestinal volume is also small, can not eat enough nutrients, in order to ensure normal lactation, only the body's muscle fat can be converted into milk; the body's nutrition is Consumed, how can there be excess ingredients to support the development of follicles? That is, normal sows during the lactation, the follicles are still in normal growth and development, quickly after the weaning heat; and these first-parity sows because the follicles are not developed, there is no mature follicles can be arranged at weaning, then it will not heat Now.
At the same time, although there is no consumption of lactation after weaning, organizations that are seriously owed to the body need a lot of nutrients to make up for it, and there are no redundant ingredients for follicle development, which results in the follicles still not developing normally; therefore, the slimmer sows The later the estrus after weaning is.
Precaution:
1. If you choose to stay or buy an excellent gilt, the gilts should wait until the mating age, standard body condition, and body weight before participating in breeding. The first estrus record of the gilts should be done well. It should not be too early or too late to breed, and it is best to wait until the second or third estrus.
2. It is not advisable to have too many sows with precocious sows and not more than their own nipples.
3, breast-feeding period should not be too long, the best implementation of early weaning, 21 days is appropriate. It is possible to use a weaning transitional liquid feed, Prasoxin, after weaning to help the piglets cross the weaning pass.
4. During lactation, some more nutritious feeds are added. For example, in the later period of pregnancy, sows are supplemented with a susceptibility edge to improve feed quality, regulate sow intestinal absorption, provide reproductive nutrition, immune nutrition, and enteral nutrition.
5, after weaning the best restocking, increase sports, feed green feed, increase feed intake to promote recovery of body condition.
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