Hashimoto M, Funaba M, Abe M, Ohshima S
Research Center, Nihon Nosan Kogyo K.K., Ibaraki, Japan.
Exp Anim. 1995 Jan;44(1):29-35. doi: 10.1538/expanim.44.29.
The effects of dietary protein levels on food and water intake, and urinary excretion of magnesium (Mg) and phosphorus (P) were examined in cats fed dry-type diets. Four adult female cats were used for trials in a 4 x 4 Latin square design, and fed diets with increasing protein content (25.9, 38.3, 51.4 or 65.2% in dry matter) daily from 9:00 to 13:00. While daily food intake was almost constant regardless of the dietary protein level, water intake and urine volume increased with increasing the dietary protein. Daily urinary excretion of P increased in response to the increase in dietary protein level. The urinary concentration of P was positively related to nitrogen (N)-intake. In contrast, daily urinary excretion of Mg was not affected by the dietary protein level, and the urinary concentration of Mg was negatively related to N intake. A dry-type diet with a high protein content might be effective in preventing the deposition of Mg salts in the urinary tract of cats under the meal-fed condition without affecting food intake because of both the lower concentration of urinary Mg resulting from the increase in urine volume and, probably, urinary acidification.
在喂食干型日粮的猫中，研究了日粮蛋白质水平对食物和水摄入量以及镁（Mg）和磷（P）尿排泄的影响。四只成年雌性猫用于4×4拉丁方设计试验，每天9:00至13:00喂食蛋白质含量递增的日粮（干物质中分别为25.9%、38.3%、51.4%或65.2%）。尽管日粮蛋白质水平不同，但每日食物摄入量几乎保持恒定，而水摄入量和尿量则随着日粮蛋白质含量的增加而增加。日粮蛋白质水平升高会使每日尿磷排泄量增加。尿磷浓度与氮（N）摄入量呈正相关。相反，日粮蛋白质水平对每日尿镁排泄量没有影响，尿镁浓度与氮摄入量呈负相关。高蛋白质含量的干型日粮可能有助于防止在定时喂食条件下猫的泌尿道中镁盐沉积，这是因为尿量增加导致尿镁浓度降低，并且可能还有尿液酸化，而这两种情况均不会影响食物摄入量。
