In order to estimate the mass transfer coefficent of swet on the body surface of cattle, the relationships between the length or diameter of the body segment and weight were investigated using Holstein cattle. On the basis of these relationships, the authors estimated the body segmental surface ares and set up experimental equations for the mass transfer of the body segmental surface using a one-eighth size model of a Holstein dairy cow smeared with naphthalene.
    These experimental equations differed only to a very small extent with the cow's orientation toward the air strem. The mass transfer coefficient for the whole body surface of the cow in a standing posture could be approximated by an experimental equation for the neck, and its convective heat transfer coefficient was obtained by the Lewis relationship.