食餌中蛋白質ならびに炭水化物含量がネコの水分出納およびストルバイト形成に及ぼす影響

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  • Effects of Dietary Protein and Carbohydrate on Water Balance and Struvite Crystallization in Urine of Cats
  • ショクジ チュウ タンパクシツ ナラビニ タンスイカブツ ガンリョウ ガ ネコ ノ スイブン スイトウ オヨビ ストルバイト ケイセイ ニ オヨボス エイキョウ

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Two experiments were conducted to examine the effect of dietary contents of CP and carbohydrate (crude fiber and NFE) on water balance and capacity to form struvite crystals in urine of healthy adult cats. In Expt 1 (n=12), effects of the CP content were evaluated by ad libitum feeding of three dry diets containing CP at 29%,50% and 71% per DM. An increase in the dietary CP content resulted in increased water intake and urine volume, decreased urinary pH, and increased urinary pSAP that is a negative logalithm of struvite activity products given by[Mg2+]×[NH4+]×[PO43-]. Conversely, HCl-insoluble fraction of urinary sediment was increased, whereas struvite crystals in urine were decreased, by an increase in dietary CP contents. In Expt 2 (n=9), effects of the dietary carbohydrate content were compared among three groups similar in CP intake but different in carbohydrate intake. The control diet was the same as the CP71 diet used in Expt 1, and the other two diets were a high-starch diet and a high-fiber diet containing 52% CP per DM. Because the CP intake was adjusted to be almost similar in all groups, carbohydrate intake in the high-starch or high-fiber group was 2.5to 3 folds higher than that in the control group. As a result, water intake and urinary volume did not differ among the three groups. Comparing with the control group, high-carbohydrate intakes resulted in lower pSAP, and urinary pH was especially higher in the high-starch group. In addition, HC1-insoluble fraction of urinary sediment and struvite crystals in urine increased or tended to increase in the high-carbohydrate groups. These results suggest that, in contrast to dietary protein, dietary carbohydrate could stimulate the formation of struvite urolith in healthy adult cats. J. Pet Anim. Nutir, Vol.6 (No.1): 12-20,2 003

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