- Red represents positive correlation and green represents negative correlation. The darker the color, the higher the correlation coefficient. PSY, piglets weaned per sow per year; MR7DW, mating rate within 7 days after weaning; FR, farrowing rate; PBAL, number of piglets born alive per litter; WPL, number of weaned piglets per litter; PD, production days; TPL, total number of piglets per litter; 21DAWP, 21-day adjusted weight of piglets; BWP, birth weight of piglets; Lat, latitude; MPR, mummified piglet rate; NPD, non-productive days; WBI, weaning to breeding interval; Lon, longitude; RSR, return-service rate; SR, stillbirth rate
