Blood Creatinine and Uric Acid Concentrations in Unsupplemented Range Cattle

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Abstract
Data from essentially unselected bull and heifer progeny of registered Hereford cattle were used to estimate mean concentrations and study genetic and broad environmental sources of variation in blood creatinine and uric acid. These cattle were maintained under ordinary semiarid range conditions. Individual animal weights and blood samples were obtained at 235, 340, 600 and 710 days of age for approximately 700 animals per sampling period. Herd size ranged from 280 to 435 cows with 9 to 12 sires per year. Year-of-birth effects were the most important source of variation considered for the blood constituents. Sex effect was significant at 340 and 710 days of age for creatinine and at all periods except weaning for uric acid. Sire effect was significant only at 600 and 710 days of age for uric acid. Heritability estimates for both creatinine and uric acid were essentially zero at all four sampling periods. Correlations of blood creatinine at the four ages were generally low and showed little relationship among the four periods.

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