REGULATION OF URINARY PHOSPHATE EXCRETION IN CAMELS

Urinary inorganic phosphorus (P) excretion was measured in 16 adult fe male non-pregnant, non-lactating daily watered camels, They were rando mly divided into four groups of four animals, Groups 1, 2 and 3 receiv ed either an i.v. infusion of phosphate or synthetic human parathyroid hormone (PTH) or PTH-related peptide (PTHrP), respectively, The fourt h group was used as a control, Intravenous P loading induced a signifi cant increase in phosphatemia and in P renal clearance, Both PTH and P THrP increased calcemia and decreased phosphatemia. They had no signif icant effect on urinary calcium excretion, but they increased P renal clearance and phosphaturia, Thus, the regulation of urinary P excretio n in normally watered camels looks similar to that already described i n other ruminants.