Sensitivity and specificity of a tail-activity measuring device for calving prediction in dairy cattle

Efficient calving surveillance is essential for avoiding stillbirth due to unattended dystocia. Calving sensors can help detect the onset of parturition and thus ensure timely assistance if necessary. Tail-raising an indicator imminent calving. The objective this study was evaluate a tail-mounted inclinometer sensor (Moocall Ltd., Dublin, Ireland) monitor skin integrity after attachment. Cows (n = 157) heifers 23) were enrolled at 275 d post insemination, attached each cow's tail. Investigators checked signs indicating stage II parturition, verified position sensor, evaluated tail above below hourly 24 h/d. We used 5 different intervals (i.e., 1, 2, 4, 12, h until calving) calculate sensitivity specificity. Sensors continuously remained on within 3 cm initial attachment position) in only 13.9% animals 25). reattached event occurred (51.6%) or animal excluded other reasons (34.4%). In 31 removed because swollen painful. Heifers significantly less likely than cows lose but more experience swelling pain. Depending interval preceding varied from 19 75% specificity 63 96%.