ドライフードの主要蛋白質源としてのチキンミールが成ネコのストルバイト形成能に及ぼす影響

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  • Effect of Chicken Meal as a Main Protein Source of Dry Food on Capacity to Form Struvite Crystals in Mature Cats
  • ドライフード ノ シュヨウ タンパクシツ ゲン ト シテ ノ チキンミール ガ セイネコ ノ ストルバイト ケイセイノウ ニ オヨボス エイキョウ

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Capacity to form struvite crystals in urine of adult cats was compared among dry diets containing chicken meal (CM), meat meal (MM) or corn gluten meal (CGM) as a main protein source. Twelve healthy cats (mean body weight; 4.0 kg) were divided into 3 groups of 4 animals each, and allotted to the 3 diets in a 3×3 Latin square design with 3 weeks per period. Contents of Ca, P, and methionine (Met) in the diets were adjusted by adding adequate amounts of Ca(PO4)2, CaCO3 and D, L-Met, because CM contained excessive amounts of Ca and P, and CGM contained a high level of Met. Every diet contained about 31% crude protein (CP) per DM, and cats were allowed to free access to the diets and water throughout the experiment. Urine was totally collected during the final 7 days of each experimental period to determine urine volume, pH, negative logarithm of struvite activity products (pSAP), number of struvite crystals in urine, and the HCl-insoluble fraction of urine centrifugal sediment as an index of insoluble organic component in urine. Urinary pH and the number of struvite crystals were determined using fresh urine. Urine volume did not differ among the groups, but urine pH differed (P<0.05) and increased in the order of CGM<CM<MM. However, urine pH exceeded 7.0 even in the CGM group. The value of pSAP was higher (P<0.05) in the CGM group, and significant difference was not detected between CM and MM groups. This result indicated that CM and MM groups were more liable to form struvite crystals and, in fact, the number of struvite crystals in urine was higher (P<0.05) in the CM and MM groups than in the CGM group. Proportion of HCl-insoluble fraction to the urine centrifugal sediment was lower (P<0.05) in the CM group than in the other two groups. In summing up, the CM has a limit as a protein source of dry cat food, because it contains excessive amounts of Ca and P, and is apt to alkalize urine.

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