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Renal Protein Excretion by Cattle Deprived of Water^1,2,

University of Nevada, Reno

Abstract

Some effects of water deprivation on renal function of cattle have been described. Most apparent, of course, is oliguresis. When cattle were deprived of water for 4 days, urine excretion was maintained for the first 24 hr. (Weeth, Sawhney and Lesperance, 1967). It then dropped 35% on the second day and was lowered by 70% on the fourth day. Cattle may adapt to infrequent drinking. When urine was collected from heifers on a once per 2 days watering regimen, the urine volume was 33% greater on the second day than on the first day after drinking (Weeth, Lesperance and Bohman, 1968). Urine specific gravity and osmotic pressure increased during water deprivation (Weeth and Lesperance, 1965); however, after 4 days deprivation the osmotic pressure was only 1289 mOsm/kg. Creatinine and osmolal clearances were reduced and plasma tonicity was increased (Weeth et al., 1967). The percent of filtered urea reabsorbed was increased, but the percent of filtered sodium reabsorbed was decreased by 4 days water deprivation.

¹ Conducted in cooperation with Western Region Research Project W-46, The Effects of Environmental Stresses on Range Cattle and Sheep Production.

² Journal Paper No. 120.