Efficient pig farms: Screening criteria for the elimination of gilts and first-born sows (reference):
(1) The gilt reaches 240 days old and still has no signs of estrus (Note: at 165 days old, it is necessary to check the gilt's emotional records);
(2) Gilts that do not appear in heat for 3 weeks after injection of PG600:
(Note: Gilts that have no record of estrus after continuous contact with boars after 24 weeks of age can be infused with PG600 intramuscularly and raised in mixed groups, generally within 20 days after intramuscular PG600 will have normal estrus);
(3) The first birth of the gilt is less than 8 heads;
(4) Gilts have udder inflammation and cannot breastfeed normally, limb and hoof damage, and have poor physique after weaning;
(5) The gilt has records of empty pregnancy, return, or miscarriage;
Note: Gilts need to be mated immediately if they have a static reaction (the 1st mating time is 12h with the 2nd interval);
The weight of the breed is maintained at about 135-145 kg, and there are 2 estrus records before the first match, which is more appropriate;
Summary: Formulate strict standards for the elimination plan of gilts or newborn sows, the purpose of which is to improve the production efficiency of pig farms and avoid ineffective consumption of feed costs, labor costs and stall costs; thereby improving the cost competitiveness of pig farms and giving play to the genetic potential of breeding pigs;
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