1. Weaning (21 days old) selection: The first selection (primary) can be performed when the piglet is weaned. The standard for picking is: the piglet must be from a sow with a high litter size, conform to the appearance standard of the breed, have good growth and development, have a large body weight, have bright fur, long back, strong limbs, and 7 nipples. For the above (more than 6 pairs of lean type pigs), there were no obvious genetic defects.
The selection of reserve gilts from the Tai Wo is mainly based on the mother's litter size and should be kept as much as possible when weaning. In general, the number of primaries is more than 10 times the final scheduled number of boars reserved, sows are more than 5 times, so that the latter can have a higher chance of election, so that the intensity of the choice to increase, is conducive to obtain a better choice progress.
2. Staying at the end of childcare (70 days):
Nursery pigs are subjected to tests such as weaning, environmental change, and reloading. The nursery will end up with 70-day-old piglets. After weaning primary piglets are nursed, some of them are not strong enough for use, and their growth is hindered, and some are inherited. Defective performance gradually, therefore, the second choice at the end of the childcare plan will be robust, heavy body weight, without licking the nipple, boar testis good primary piglets into the next phase determination.
3, the end of the measurement phase selection:
The performance measurement is usually completed at the age of 5-6 months. At this time, the individual's important production traits (except for reproductive performance) have basically shown. Therefore, this phase is the key period for selection and should be the main election phase. Should do:
1 Those who have physical weakness, obvious limb disorders, inverted nipples, severe signs of loss of body shape, a particularly small genital area, and genetic defects in their litters may be eliminated first. We will conduct a survey of the nipple defects and leg and foot fidelity of male and female pigs.
2 The remaining individuals should be selected for retention or eliminated according to the comprehensive breeding value index composed of the growth rate and the production traits of living backfat. Individual selection must be conducted strictly according to the level of the comprehensive breeding value index. The number of stays at this stage may be 15% to 20% more than the final number of seeds.
4. Sows breeding and breeding stage selection: At this time, reserve breeding pigs have passed three choices, and their ancestry, growth and development and appearance have been more fully assessed. Therefore, the main basis for this period is the reproductive performance of the individual. Sows may be considered to be eliminated in the following cases: There are no estrus signs after 1 to 7 months of age; 2 In the course of one estrus, 3 consecutive inexperienced persons; 3 After 3 months of weaning, no signs of estrus; 4 Maternal too Poor; 5 who have too few litters. 5 Boars have low libido, poor semen quality, and fewer litters in sows
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