Relation between daily urinary creatinine and body weight in castrated male Landrace pigs

For clarifying the relation between the amount of daily urinary creatinine (Cr) and the body weight (BW), fifty-eight healthy castrated male Landrace pigs ranging from 28.6 kg to 93.5 kg in body weight (BW) were examined. There was a significant positive correlation between the BW (X = kg) and Cr (Y = mg/day), and a linear regression formula of Y = 40.7X-224.9 (R2 = 0.985, P < 0.001) was obtained. The coefficient of variation of the daily urinary Cr was small (5.1 +/- 2.4%). On the other hand, in the relation between the BW and quantity of urine in 24 hr, and in the relation between the daily urinary creatinine and daily urinary volume, no significant correlation was recognized (P > 0.2), respectively.