EFFECT OF PARTURITION ON SOW URINARY CREATININE

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Abstract
Total urinary creatinine (UC) was measured three times a day between day 5 prepartum and day 4 postpartum in 13 Yorkshire sows. Total UC remained unchanged during days 5, 4, and 3, and decreased (P > 0.05) during days 2 and 1 prepartum. After parturition, levels increased (P < 0.0001), reaching peak values on day 2 and declining thereafter to approximately prepartum values. Differences in total UC did not exist between the three collection periods of the day. However, large differences (P < 0.01) existed between animals. Correlations between litter weight (LW) and changes in UC excretion (CUCE) for days 1 and 2 postpartum were 0.746 and 0.749, respectively (P < 0.01), while for days 3 and 4 postpartum, the correlation was only 0.349 and 0.463, respectively (P > 0.05). Prediction equations based on LW were developed for estimating CUCE. Results indicated that if UC is to be utilized as an index for expressing concentrations of urinary metabolites, during the first 2 days following parturition, correction must be made for CUCE.