1, gilts must be from litter size, nurturing rate, weaning sows with higher litter weight, to select the second to fifth child sows offspring is appropriate.

2. The gilt should meet the appearance criteria of this species, with good growth and development, light fur, long back, large hindquarters, full body, strong and powerful limbs, and well-prepared limbs and legs, and the legs should not be too straight.

3, gilts 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 licking nipples and deputy nipples, the purulent development and sagging, The shape is normal.

4. According to the relationship between age and weight, select gilts - birth weight more than 1.5kg, 28-day-old weaned weight of 8kg, 70-day-old body weight of 30kg, body weight up to 100kg when not more than 150 days; 100kg weight During the measurement, the ultrasonic backfat at 6 cm from the penultimate third to fourth rib from the dorsal midline was less than 2.0 cm thick.

5. When considering the performance of the gilts themselves, we must consider the performance of their parents and compatriots. Based on the comprehensive information of themselves, their compatriots and their ancestors, select the sow that has fast growth, high feed utilization, and good sibling traits. Nest pigs cannot have hereditary defects such as hernia, cryptorchidism, and prolapse.

6. The gilt was selected last time before the initial allocation. The sows whose development of the sex organs was not ideal, the estrus cycle was irregular, and the estrus was not obvious were eliminated in time.

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