Identifying Early-Life Behavior to Predict Mothering Ability in Swine Utilizing NU System.

Early indicator traits for swine reproduction and longevity support economical selection decision-making. Activity is a key variable impacting a sow's herd life and productivity. Early-life activities could contribute to farrowing traits including gestation length (GL), number born alive (NBA), and number weaned (NW). Beginning at 20 weeks of age, 480 gilts were video recorded for 7 consecutive days and processed using the NU system. Activity traits included angle rotated (radians), average speed (m/s), distance traveled (m), time spent eating (s), lying lateral (s), lying sternal (s), standing (s), and sitting (s). Final daily activity values were averaged across the period under cameras. Parity one data were collected for all gilts considered. Data were analyzed using linear regression models (R version 4.0.2). GL was significantly impacted by angle rotated ( = 0.03), average speed ( = 0.07), distance traveled ( = 0.05), time spent lying lateral ( = 0.003), and lying sternal (0.02). NBA was significantly impacted by time spent lying lateral ( = 0.01), lying sternal ( = 0.07), and time spent sitting ( = 0.08). NW was significantly impacted by time spent eating ( = 0.09), time spent lying lateral ( = 0.04), and time spent sitting ( = 0.007). This analysis suggests early-life gilt activities are associated with sow productivity traits of importance. Further examination of the link between behaviors compiled utilizing NU and reproductive traits is necessitated to further isolate behavioral differences for potential use in selection decisions.