First, focus on improving sow reproductive efficiency

(I) Pay attention to the useful life of sows

Sows can be defined as young female sows that are older than 200 days old. The reasons for the elimination of sows in general farms are due to reproductive disorders, foot problems, and low production head counts. This involves aspects such as breed, nutrition, barn, health and management. Therefore, the adequate supply of nutritive balanced feed, good barn environment and the strong foot structure of the preserved sows are the usual issues for pig farm selection and feeding management.

Good sow management can keep the sow's useful life of more than 3 years, and the proportion of deaths and culling does not exceed 30%.

Although there is no reliable data, it is estimated that the proportion of deaths and culling of sows in pig farms in Taiwan will be more than 40% per year.

Reducing the proportion of sows killed and eliminated will have a great impact on improving reproductive efficiency. For example, if the elimination rate is 30% compared to 55% of the farms, the sows will receive 1.5 more weaned piglets per year. The reason for the increase in mortality caused by death and elimination was due to feeding and management, and the proportion in the hot season was higher than in the cool season. Therefore, it is necessary to keep the ambient temperature normal and cool and cool in summer. In the summer, it is very important to maintain the semen quality of the boar or artificial insemination and improve the breeding technique.

(ii) Age of first mating

The current standard for selection of sows to be sows should reach 90 kg at 150 days, and the second or third estrus should occur before at least 240 months of 8 months and 130 kg of body weight, and be accompanied by species.

If sows are to be sowed earlier than 8 months of age, they should be weighed 70 kilograms when the young sow is selected for breeding. Ten young sows are selected for group rearing and mature boars are used for 10-20 minutes per day. Contact the young sow in this column for passion. In this way, some young sows can have their first estrus in 2 weeks. The estrus young sows are grouped with other estrus young sows and introduced into the boar passion. Some young sows will have a second estrus. They can be bred on the second occasion when the young sow is estrus depending on weight and need, or they can wait for the third estrus to be bred. The rest of the young sows that are not estrus or have no obvious estrus are sold as hogs without any seed use.

Of course, between the time the young sow is kept and the observation of the hair, the amount of feed should be more than 2 kg, the amount of feed protein is 14%, and the amount of digestion energy per kilogram of feed is at least 3,100 kcal. If pig farms do not have access to feed for young sows, late hog or big pig feeds can be used as reserved young sows. In addition, pay attention to the amount of minerals, such as calcium and phosphorus, and the full supply of vitamins.

(c) Shortening the number of days of two births

The number of days between two successful births includes the number of days from weaning to re-breeding, pregnancy and lactation. In general, sows are averaged within 10 days from weaning to re-breeding, and if more than 10 days, the sows are indifferent. The average period of pregnancy is 114 days, ranging from 112 to 118 days, compared with an average of 28 days during the lactation period, and generally between 21 and 35 days in Taiwan.

If a sow is weaned until it is bred, 10, 114, and 28 days during pregnancy and lactation, respectively, one sow can produce 2.4 births per year. In fact, the annual number of fetuses on sow farms is much lower than 2.4 births because the number of days from sow weaning to re-breeding exceeds 10 days. How to shorten the number of days from weaning to re-breeding is the key to improving sow breeding efficiency. Its practice is that, after weaning, the sow can be displaced by several columns and has access to mature boars for early estrus and breeding. Increased feed intake or all meals during lactation, as well as feeding stimulation prior to mating after the sow's breasts are swollen, is an approach that advances the estrus of the sow and increases the number of ovulation and the number of litters.

(IV) Increase the number of piglets

For new sows, feeding stimulation 10-14 days before mating increases the number of sows ovulated and increases the number of piglets produced, especially for thinner gilts. In fact, sows ovulation number 18-20, but when mating, whether natural mating or artificial insemination will be due to the maturation of the appropriate timing, resulting in too early or too late mating, loss of part of the egg. Therefore, it is very important to master the appropriate breeding period. New sows received boars or artificially tested 12 hours after standing to perform the first breeding, followed by a second breeding after 8-12 hours. The sows were delayed 4 hours, that is, the first breeding at 16 hours, and the second breeding after 8-12 hours.

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