Khan, Ghosh & Sasidharan (1978a) and Khan, Sasidharan & Ghosh (1978b) have reported on Barmer goats' efficiency in water economy under the conditions of the Rajasthan desert, India. Some earlier reports also pointed to the superiority of dosert-adapted goats of other breeds in this respect (Maloiy & Taylor, 1971; Shkolnik, Borut & Choshniak, 1972; Dawson et al. 1975). Recently, Khan, Sasidharan & Ghosh (1978 c) have recorded evidence which indicates that Banner goats' management of the body's water balance is decidedly superior to that of desert sheep. However, just as these two species exhibit wide divergence in their behavioural responses to environmental stresses, they appear to exhibit physiological responses of different types in combating such stresses. In the present note, information on a few important indices of adaptation to water insufficiency conditions, namely, glomerular nitration rate (GFR) and blood and urinary urea concentrations in Barmer goats are presented.