The aim of this work was to select the most useful arteries for blood sampling in calves and cows in relation to the evaluation of acid-base balance and blood gases in cattle. Following the anatomy and literature data, we chose six central and peripheral arteries -a. axillaris, a. carotis communis, a. brachialis, a. saphena, a. caudalis mediana, and a. auricularis caudalis. The blood samples were collected from 152 calves (2 weeks-6 months old) and 51 dairy cows. The efficiency of collection was evaluated with emphasis on minimizing the restraining and stressing of the animals, because of the possible effects of the animals' responses on blood gases values. In both categories, the results showed that the most convenient and reliable sampling sites were a. axillaris and a. auricularis caudalis. Both in calves and cows, punctures of a. carotis communis and a. caudalis mediana were less successful because of more demanding restraint, the stronger responses of the animals, and the less repeatibility of the sampling, resp. The least efficiency was recorded for the punctures of a. brachialis and a. saphena. Moreover, in these punctures, the difficult restraint of calves in the lateral position may lead to significant changes in the examined indices.
Cattle, arterial blood, blood collection, acid-base balance, blood gasesCollection and examination of blood are frequent operations within the complex of clinical and laboratory diagnosis of health disorders in animals. Venous blood is collected the most frequently; collection of arterial or arterialized capillary blood is less frequent. Some authors used arterial blood for the investigation of arterio-venous differences in the concentrations of some metabolites (Björkman et al. 1992;Gallagher et al. 1997; MudroÀ et al. 1999). However, in clinical practice, the analysis of arterial blood is particularly important in evaluating the acid-base balance (ABB) and blood gases (BG). The analysis of arterial blood has a special position in the pathogenesis and diagnosis of respiratory diseases, the pathogenesis of intoxications, anaemias, and various diseases exerting primary or secondary effects on blood gases values, and the saturation of haemoglobin with oxygen. Information on oxygenation, ventilation, as well as on metabolic acid-base disorders in peripartal period obtained by analysis of blood gases in the arterial blood represents a practical example of the use of arterial blood in calves (Adams et al. 1991). Examination of venous blood does not yield complete information on the respiratory functions (Speirs 1980). Wide use of collection and analysis of arterial blood was hampered mostly by the costs of laboratory equipment needed to analyse ABB and BG. Advances in analytical technologies, acceptable prices and user-friendly instruments create opportunities for the wider use of arterial blood analyses both in veterinary practice and research activities (Collie 1991). In calves and adult cattle, several possible sites of arterial blood collection are described (Slanina et al....