The quality of gilts determines the quality of breeding pigs and the effect of economic cross-breeding, which affects the economic benefits of the farm. In the practice of raising pigs, gilts are selected throughout the whole process of their growth and development, and comprehensive inspections must be conducted.
First, choose to stay according to physical condition
1. Health status and appearance
The gilts should be sows with normal growth and development, a lively, healthy and disease-free sow, and a family from which there are no hereditary diseases (such as neatly arranged nipples, nipples, etc.). The appearance should have the standard features (such as coat color, head shape, ear shape, body shape, etc.) of the species and it should be well developed, with bright fur, long back, large hindquarters, full body and strong limbs. With correct legs and feet, the legs should not be too straight; effective nipples should be more than 7 pairs, arranged neatly, evenly distributed, without a hernia nipple; normal external genitalia, strong limbs, a certain depth of body.
2. Reproductive performance
Breeding performance is an important trait in breeding pigs. The gilts should be from high-fertility families (ie, high-quality sows produced from farrowing, high lactation rates, and high wean weights). And there are good external reproductive organs, and estrus obvious, easy to conceive, a high number of litter size, strong lactation, maternal good, piglets bred.
3. Production performance and carcass performance
The parents of gilts should have strong production capacity, fast growth, good stress resistance, and high feed conversion rates. The sibling littermates had good carcass traits, high uniformity and small individual differences. Birth weight is more than 1.5 kilograms, on the 28th weaning weight of 8 kilograms, 70 days old weight of 30 kilograms, and moderate phlegm, but the fat is not too thin. At the age of 6 months, the staff can use equipment to measure the pig's backfat thickness and eye muscle area to determine the growth of the pig's backfat and lean meat. In general, the sow is appropriately lower than the boar standard.
Second, according to the growth stage
1. Weaning stage
This stage is mainly based on the parental value (number of litters in sow litters, number of weaned piglets, and orderliness of littermates); growth and development in itself (good growth, body size, long back, long hindquarters, full body shape , limbs strong); body shape to meet the shape of the standard of the species; no genetic defects (more than 14 effective nipples, no nipples) to leave for election, choose to stay 5-10 times.
2. Determination of performance of sports fertilizer
This stage is generally completed at the age of 5-6 months, the owner can be measured at the optional time period. At this stage, selection and elimination are mainly based on the comprehensive index consisting of the growth and development of sows, growth rate, live backfat, and puberty. This period stays 15%-20% more.
3. Sows breeding breeding stage
This phase is mainly selected based on individual reproductive performance. Generally selected to leave estrus obvious, easy to conceive, more calving, high milk power, good motherhood, piglets high survival rate of sows. After 7 months of age, there were no signs of estrus, and the same situation was continuously bred for 3 times without fetus, and sows with no estrus, poor maternity, and few litters after 2-3 months of weaning should be eliminated.
4. Final stage
When the sow has a second-born reproductive record, it can be used to determine whether to keep it for seed use based on the comprehensive information of the sow itself, offspring, compatriots, and ancestors.
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