A Model of Respiratory Vapor Loss in Holstein Dairy Cattle

ABSTRACT EQUATIONS are presented that provide an accurate means of predicting respiration rate, tidal volume, and respiratory vapor loss, in the Holstein cow, as a func-tion of ambient temperature and relative humidity. The equations, assuming the expired air is saturated at some temperature below body temperature, provide a more ac-curate means of predicting respiratory vapor loss than has been possible by assuming that the expired air is saturated and at body temperature.