Select quality gilts to "three look"

In swine production, the sows must be constantly updated, that is, timely selection of high-quality gilts for replenishing sows at the same time as weeding out old frail, delayed estrus, poor lactation, and breeding sows. The so-called gilts are the sows that were reared for breeding before the first breeding. In the practice of pig rearing, the selection of gilts is very technical and runs through the whole process of growth and development. It is necessary to conduct a comprehensive inspection based on various comprehensive performances and performances of their parents, siblings and themselves.

To see maternal gilts must be from sows that produce a large number of breeders, have a high birth rate, and have a high weaning weight, and choose to keep the offspring of 2 to 5 sows. The gilts' parents should have strong production capacity, fast growth, good stress resistance, and high feed utilization.

The siblings had similar carcass traits, high uniformity, and small individual differences. There were no hereditary genetic defects in siblings such as hernia, cryptorchidism, sucking milk, and rectal prolapse.

See their own production performance standards for high-quality gilts: appearance (hair color, head shape, ear shape, body shape, etc.) meet the standards of this species, and the growth and development is good, the fur is bright, the back is wide, the hindquarters are large, the figure is full, and the limbs are full. Strong and powerful, with correct legs and feet, legs should not be too straight; effective nipples should be more than 7 pairs (more than 6 pairs of lean type pigs), neatly arranged, moderate spacing, uniform distribution, no genetic defects, no breast milk and Vice nipples; good genital development, large purulent development and drooping, normal shape; birth weight more than 1.5 kilograms, 28 kilogram weaning weight 8 kilograms, 70 days weight 30 kilograms, and moderate body weight, but not fat Too thin. In the first screening before the first allocation, sows with unsatisfactory sexual development, irregular estrus cycle, and indistinct estrus should be eliminated in time.

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