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The most cases of statistically significant differences between bull calves of different were found in rearing stations where the traits formed at a more favourable level. The investigated traits for all genotype groups of bulls assumed significantly different values in particular years of rearing. Crosses (BW × HF) reached higher body weight and higher daily weight gains than the inland BW bulls. The height at withers depended on the genotype and the interaction: genotype x rearing year. The bulls were the taller the greater was the HF blood addition. The chest girth depended on the genotype and rearing year The smallest was recorded in the BW bulls. The measurement coefficient depended, first of all, on the genotype. The highest values of this index were found for BW bulls; the higher was the HF blood addition the lower was the massiveness index. To the A and B class the lowest number of BW bulls was assigned, whereas the highest number of bulls assigned to these classes was of bulls of the genotype of 50% and 75% HF.
The respective investigations were carried out in the central rearing station of bulls at Mrozowo on 92 animals aging 1-12 months. Every month blood samples were taken from bulls and the level of hemoglobin, erythrocytes, leucocytes, hematocrit, total protein and its fractions, urea, α-amine nitrogen, AspAT, ALAT, AP, glucose, cholesterol and bilirubin was determined. The results were subjected to the statistical analysis. It has been found that along with the growth of bulls increased in the blood serum the total protein level due to an increase of γ-globulin fractions. The activity increased since the age of 5 months and then it gradually decreased. The cholesterol level increased since the age of 4 months. Among the blood indices investigated the stablest values in subsequent month of life of the bulls showed erythrocytes, hematocrit and albumins.
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