Dairy cows require approximately 12 hours of lying time daily for rest and rumination, making stall design a critical determinant of their welfare.
Lying time is one of the most reliable indicators of dairy cow welfare because cows prioritize rest and will accept pain to obtain it when it has been denied. A cow that cannot comfortably lie down for 12 hours daily experiences cumulative physical and physiological stress affecting her immune function, reproductive performance, and hoof health. Stall design determines whether lying is possible: stalls too short cause cows to lie with legs hanging out; stalls too narrow cause abnormal positioning; hard surfaces cause pressure sores on hocks and knees. Sand bedding provides exceptional comfort because it conforms to the body and stays clean. Well-designed free stall housing with appropriate dimensions and soft bedding allows cows to meet their lying time needs, which is a prerequisite for the other components of dairy cow welfare.