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See maternal gilts must be from sows that have a high number of births, a high rate of nurturing, and a high weaning weight, and it is advisable to select 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 sibling littermates showed good 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 kg, 28-day-old weaning weight 8 kg, 70-day-old body weight 30 kg, and moderate body weight, but not fat Too thin. After the initial screening, the sows should be eliminated in time if the development of the sexual organs is not satisfactory, the estrus cycle is irregular, and the estrus phenomenon is not obvious.
Technical points for selecting gilts
In swine production, sows need to be constantly updated, that is, in the elimination of old and weak, estrus, sluggish lactation and breeding sows at the same time, timely selection of high-quality breeding gilts supplement production. The so-called gilts are the sows whose piglets are kept until they are sowed for the first time. 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.