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Table 6 Faecal excretion (mg/kg body weight/day) and apparent digestibility (App. digestib.) (%) of crude protein (CP) and minerals of cats fed diets with varying protein concentrations and qualities. n = 10 / diet, Mean and SEM

From: Influence of protein concentration and quality in a canned diet on urine composition, apparent nutrient digestibility and energy supply in adult cats

     P values (polynomial contrasts)
  Low protein quality High protein quality SEM Interaction Low protein quality High protein quality Protein concentration Protein quality
  36.7% 45.0% 56.1% 36.2% 43.3% 54.9%    Lin. Quadr. Lin. Quadr. Lin. Quadr.  
Faecal CP excretion 423 600 553 418 458 625 20.9 0.076 0.004 0.524 0.609
App. digestib. of CP 89.7 87.7 90.7 89.0 89.7 89.5 0.30 0.133 0.376 0.117 0.943
Faecal Ca excretion 74.0 92.5 109 93.0 93.7 117 4.71 0.522 0.012 0.871 0.411
App. digestib. of Ca 40.8 22.0 18.0 17.3 19.2 8.85 3.32 0.394 0.086 0.547 0.257
Faecal P excretion 33.7 44.5 47.8 43.1 44.2 54.8 1.92 0.305 0.018 0.895 0.123
App. digestib. of P 65.6 49.2 49.1 46.8 47.5 41.6 1.95 0.165 0.062 0.274 0.038
Faecal Na excretion 3.12 4.09 3.70 2.43 2.74 3.81 0.21 0.260 0.009 0.683 0.005
App. digestib. of Na 95.4 93.7 95.8 95.5 95.5 94.8 0.24 0.057 0.963 0.122 0.153
Faecal Mg excretion 3.47 4.59 4.23 3.99 4.14 4.94 0.15 0.121 0.054 0.496 0.243
App. digestib. of Mg 34.9 10.3 14.0 13.1 13.6 6.01 2.74 0.237 0.123 0.280 0.119
Faecal K excretion 3.15 3.95 3.07 3.16 2.63 3.29 0.18 0.069 0.612 0.996 0.244
App. digestib. of K 97.5 96.2 97.7 96.6 97.1 96.6 0.13 0.005 0.314 0.001 0.698 0.022
Faecal Ox excretion 0.80 0.94 0.96 0.98 0.87 0.98 0.04 0.330 0.458 0.818 0.389