The sow herd is the source of the whole aquaculture production and the locomotive of the profit of the pig farm. Therefore, the sow's breeding is very important. As long as we can raise the entire breeding production of the sow herd, it will be half successful. In the breeding process, in order to maximize the profitability of the farm, the sow herd needs to maintain a suitable gestational age structure and eliminate non-compliance sows in time.
Foreign experts generally believe that the sow herd must have established elimination methods. The proportion of sows at each gestational age should remain stable, and the ideal proportion of sows of 1 to 8 gestational age should be approximately 17%, 16%, and 15%, respectively. 14%, 13%, 12%, 10% and less than 4%.
If there are enough unbred gilts, several general principles must be followed to decide whether to eliminate certain sows at weaning.
First of all: we must eliminate two consecutive sows with fewer litters, but the first-time sows are too lightly weighted, excessive feeding during pregnancy, too much weight loss during lactation, and poorly weaned boars should not be included.
Second: Sisters that are not estrus should be eliminated when they are treated with hormones. Sows should be observed for up to 18 days after weaning and 7 days after hormone treatment. If these sows do not fit into the next estrus, they should be eliminated because the sows’ farrowing rates are generally comparable. low.
Again: We must eliminate sows that have already produced 6 to 7 babies. Because they have started to have problems usually include: a small number of live litters (mainly due to an increase in the number of stillbirths), uneven size of their piglets, weaker piglets are susceptible to cold, illness, increased incidence of mastitis, body clumsiness, easy to pressure Dead piglets and so on.
In order to reduce the problem of movement disorders, attention should be paid to the conditions of the limbs when selecting or purchasing sows, using high-quality floors in the pens, and the weight of the sows should not be too large. However, despite the fact that leg and foot disease still occurs, the sows suffer from poor health status. If there are infectious diseases, it will inevitably be eliminated.
summary:
In clinical services, we have encountered cases where sows have been kept on a farm for more than 7 years. Such sows generally have more reproductive problems and the production potential of their offspring is difficult to exert. When we cull sow, we should conduct comprehensive analysis and evaluation, decisively eliminate low-capacity sows, and build a reasonable gestational age sow herds, and only such aquaculture production can obtain the best breeding efficiency.
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