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Table 7 Urea and creatinine concentrations in the blood 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.

 

Urea (mmol/l)

7.99

8.77

9.56

7.89

8.45

9.60

0.17

0.453

< 0.001

0.539

0.839

Creatinine (μmol/l)

151

153

142

160

150

149

2.69

0.432

0.004

0.711

0.112

  1. Reference range for urea: 5.0–11.3 mmol/l; reference range for creatinine: 0–168 μmol/l (Clinic of Small Animals, Freie Universität Berlin)