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Intermittent Saline Watering of Growing Beef Heifers^{1, 2,}

University of Nevada, Reno

Abstract

The effects of watering Hereford heifers once/day or once/2 days with tap water (<245 ppm total dissolved solids), 0.50% NaCl or 0.65% NaCl were studied in two summer experiments. Experimental designs were Latin squares with 30-day periods. Total urine was collected on the last 6 days and renal clearance observations were made on the last day.

Watering once/day decreased water consumption when compared with ^{ad libitum} drinking. Watering once/2 days further decreased consumption, except that consumption of tap water once/2 days was not significantly less than consumption with once/day watering.

A prompt and distinct diuresis occurred when the heifers consumed salt water following deprivation. This was not evident with tap water. Renal clearance observations indicate that creatinine, urea-N and solute clearances increased with saline diuresis, but these clearances were not increased following the consumption of tap water. Renal reabsorption of solute-free water increased post-drinking with saline water. It appeared that when saline water was consumed intermittently this water became involved in renal osmoregulation rather than in tissue rehydration.

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. 68.