Lying time is one of the most important welfare indicators for dairy cows. Cows have a strong motivation to lie down for 10-14 hours per day, and inadequate lying opportunity causes significant cumulative welfare harm.
Lying time is a foundation welfare indicator for dairy cows because it reflects the integration of multiple welfare dimensions: pain (lame cows can't lie comfortably), social competition (subordinate cows are displaced from cubicles), physical environment quality (poorly designed or dirty cubicles are avoided), and heat stress. A cow forced to stand for hours beyond her behavioural need experiences increasing physical discomfort and stress. This cumulative daily deprivation, over a lactation of 305 days, represents an enormous welfare burden for millions of cows in systems with inadequate lying provision. Regular monitoring of lying time — now possible with affordable electronic leg monitors — allows farmers to detect welfare problems before they become clinically visible, enabling early intervention that benefits both cow welfare and farm economics.