[Development of water space volumes in calves during the first month of life. III. Changes in the plasma and circulating blood volumes].

Abstract

The experiment was performed on the flock mentioned in part I. The plasma and circulating blood volumes have been determined using Evans Blue (T-1824). The plasma volume expressed in litres increased slowly but systematically during the examination period. A clear and statistically significant correlation between fluctuations in the absolute plasma amount and a calf age, its weight and body area has been observed. Calculated per kilogram and square metre of a calf body the plasma volume decreased significantly during the experimental period which fact found its statistical confirmation. The results correlated veritably and negatively with ages of the animals. The absolute volume of circulating blood in calves constitutions between 5th and 31st day of animals lives has increased but the differences found could not be confirmed statistically. A positive and veritable correlation has been observed between the obtained results and ages, weights and body areas of the examined calves. The circulating blood volume calculated both in terms of animals' weights and body areas during the first month of their lives decreased which fact has been statistically confirmed. The values as obtained in the experiment appeared negatively but veritably correlated with ages of the animals.