Plasticity and consistency of lying and ruminating behaviours of heifers exposed to different cubicle availability: A glance at individuality

•Plasticity and consistency (individuality) are important components of behaviour.•Heifers were exposed to 3 cubicle availabilities randomly distributed for 36 days.•Rumination balanced toward plasticity due to its importance for energy acquisition.•Lying balanced toward consistency due to the energy expenditure of mild stress.•Individuality generates welfare risks if behaviours at different intensities exist.