Estimating water consumption and factors affecting intake in grazing cattle

Water consumption (WC) by 39.5 animal units (AU) of grazing cattle was studied at a central Alberta site in summer. Average WC AU −1 was estimated at 48.9 L d −1 . WC increased by 0.68 L AU −1 (P < 0.01) for each percentage decrease in relative humidity, increased by 0.81 L AU −1 (P < 0.02) for each degree Celsius increase in maximum daily temperature, and increased by 0.15 L AU −1 (P < 0.06) as cattle grew and the season progressed. Relative humidity is shown to be an important determinant of WC in grazing cattle.