Effect of Urea Intake on Water Intake, Urine Volume and Some Urinary Mineral Levels in Sheep

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  • 尿素の経口投与がめん羊の飲水量,尿量および尿中ミネラル濃度に及ぼす影響
  • ニョウソ ノ ケイコウ トウヨ ガ メンヨウ ノ インスイリョウ ニョウリョウ

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The object of this experiment was to study the effect of urea intake on water intake, urine volume and some urinary mineral levels in sheep to know the effect of urea intake on the occurrence of urolithiasis in ruminants on high concentrate ration. Six adult wethers were allotted to two uniform lots (soy-protein lot and urea lot) and were used in 2×2 factorial design trials. Each trial involved a 14-day preliminary period followed by a 10-day fecal and urinary collection period. During the collection period, water intake, urine volume, fecal moisture, urinary pH, urinary osmotic pressure and urinary Ca, Mg and P were determined. Experimental data were evaluated statistically by analysis of variance performed among groups, treatments and periods. Urine volume per metabolic body size was significantly greater (131%, P⟨.05) in the urea-fed animals than in the soy-protein-fed animals. Similar but non-significant increase was found on water intake (117%) in the animals which received urea ration. However, no difference was observed on fecal moisture, urinary osmotic pressure, Hematocrit and urinary pH, urinary Ca and P levels between the treatments. Urinary Mg level in the urea-fed animals was lower than that of the soy-protein-fed animals. The results suggested that effect of urea intake on the prevention of urolithiasis seemed to be introduced by the increased excretion of urine and not by other factors such as the changes of urinary pH or urinary levels of minerals. The relationship between water intake and urine volume in this experiment was known to be described in the following equation; U. V.=0.189 W. I. +68.97, where U. V. and W. I. =urine volume (ml) and water intake (ml) per metabolic body size of the animals per day.

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