| Popis: |
Hemogasometry is a test that evaluates hydroelectrolyte and acid-base balance and lung function. The physiological parameters can be influenced by age and management and environmental factors, as well as the blood sample used: venous or arterial. The objective of this study was to analyze arterial and venous blood gas parameters of healthy Brahman cattle in Brazil, to determine reference values for animals of this breed, comparing age and sex of the animals, in addition to evaluating the adaptation between arterial and venous results . Eighty healthy cattle (40 males and 40 females) were grouped according to age group (Group I: from 5 to 30 days; Group II: from 31 days to 6 months; Group III: from 7 to 18 months; Group IV: from 19 to 36 months) and gender. The animals were examined by physical examination prior to the collection of venous and arterial blood samples. Blood gas analysis was performed immediately after blood collections, using the I-STAT® portable device with EG7+ cartridge. There was a difference between age groups for rectal temperature (RT), respiratory rate (RR) and heart rate (HR), and age × gender interaction for RT and RR. Younger animals had higher RT, HR and FR. Females had higher TR than males. As for blood gas parameters, only oxygen pressure (pO2) and arterial and venous concentrations of sodium ions (Na+) experienced the interaction between age × gender. While pH, carbon oxygen pressure (pCO2), oxygen saturation (sO2) and arterial and venous potassium (K+) and calcium (iCa2+) concentrations were influenced by the age of the animals. Animals in the I group had as main differences in blood gas parameters compared to adults, neonates (Group I) had lower values of pH and sO2, and higher values of pCO2, K+ and iCa2+ both arterial and venous. High dynamics can be observed in the values of pH, Na+, hematocrit and hemoglobin (Hb) when measured in arterial and venous blood, therefore, one value can be obtained by the other. The other variables were very dispersed, confirming the differences pointed out in the literature between arterial and venous blood. Finally, the results of this study can be used as a reference for healthy animals of the Brahman breed. |
