Research in veterinary science
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Ears of calves were made hyperaemic by using a rubefacient. Blood from the hyperaemic ear was sampled in capillary tubes and analysed for pO2, pCO2, pH and bicarbonate. ⋯ For pO2 and bicarbonate values a highly significant correlation was found between the two sets of results (P less than 0.001); for pH and pCO2 close correlations were found (P less than 0.01). The results indicate that blood samples from arterialised capillaries can be used as a substitute for blood obtained by arterial puncture.