While the scientific origin remains unclear, it is widely believed that the capacity of the abomasum is about 2 l, and that milk meal sizes beyond this volume will cause milk to
enter the rumen. In a study from 2012, Flor et al. also calculated the abomasal volume to be less than 2 l based on computed tomography (CT)scans. They did not, however, report the size of the offered milk meal or actual intake by the calf.