The correct choice of sows

Well-chosen sows should be selected from the following three aspects: I. Variety The sows reared in our province were mostly local soil hogs, but now with the improvement of people's living standards and the needs of the international and domestic markets, sows are now kept It is shifting to lean sows. Therefore, it is recommended that the province should choose to grow up and grow long, and use the Duroc boars for mating; secondly, select heterozygous sows, such as The Taiyuan flower pig female parent specialized strain cultivated by the Provincial Bureau of Animal Husbandry, the Dahamei lean female parental line, and Beijing black pigs and Hubei white pigs. The boar chose Changbai, Dabai, Duroc, etc. The local soil pigs are best not to be cultivated. Second, the appearance? The shape of the preserved sow must meet the requirements, eyes and minds, smooth fur, appetite, flexible action, bulimia strong, strong and healthy. It is particularly critical that the limbs be strong, the number of nipples is not less than six pairs, and it is best to have seven pairs. They are arranged neatly, have no sucking tits, and are free of hereditary diseases such as belching. Third, the development stage? 1. The selection of weaned pigs mainly considers the parents' performance, the uniformity of litter mates, and their own growth and development status and physical appearance. Generally speaking, the piglets born in the same period are basically similar in management and environmental conditions. To choose the remaining piglets, the first is that the parents have excellent grades, and then consider the selection from the litter of litter-producing piglets that are more and more uniform, and at the same time ask for constitution. The appearance conforms to the species characteristics. At this time, selection should generally be 4 to 5 times the amount of seeds left. The selection of 2.6 months old pigs focuses on the growth rate and feed utilization rate. At the same time, it is necessary to observe the appearance, whether there are abnormal nipples, presence or absence of pimple, and abnormal reproductive organs. At this point, the selection is generally 1.5 times the number of seeds left. Due to the large margin of choice, stricter requirements, slow growth, and definite shape defects should be selected. General pig breeds have estrus performance at the age of 6 months. At this time, boars can be used to induce male boars. Local breed pigs can be used at this time. Breeding breeds and foreign breeds are generally delayed by 1 to 2 months. When the breeding performance is not good, such as obvious heat but refuse to match, there is no stable standing reaction within a period of love, abnormal development of reproductive organs should be eliminated in time. 3. Selection of the first-born sow This time the breeder has been screened twice and has already had a relatively comprehensive understanding of his parents' performance, individual development and appearance, so the choice of this time depends mainly on the level of her fertility. First, the number of litters should be eliminated; second, the poor milk production capacity, and the small and uneven litter at weaning should be eliminated. However, it should be noted that the difference in the number of births, the amount of milk produced, and the rate of breast-feeding among sows is sometimes very large. Therefore, the performance of the first-born pig should be kept as far as possible. 4. Selection of sows at or above the second-in-a-row time The breeding pigs left at this time are generally not deficient in the number of litters. There are fewer litters (less than 9) for the first litter, and the feeding capacity is poor (high mortality during the nursery period). Piglets are not well developed) should be eliminated. At this time, the pigs have already had offspring, and the sows with poor growth and development of their offspring should be eliminated.

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