Variability in the number of erythrocytes in sheep blood I. Trends in breed and seasonal changeability
2008
Bojchev, K. | Shindarska, Z. | Kolushev, N.
The aim of this study was to determine the trends in the variability of the number of erythrocytes in sheep blood and to evaluate the role of the factors breed appurtenance and annual season in the structure of the total variability of this hematological parameter. The experiment was carried out with 394 sheep from four breeds (Awassi, East Friesian, Pleven black-headed, Romanov) and crossbreedings of the Synthetic Population Bulgarian Dairy sheep. The blood samples were taken in April, July, November and February from v. jugularis. The effects of the factors discussed were evaluated by the coefficient of interclass correlation. The number of erythrocytes in the blood of the investigated populations varied from 6.80x1012/l (for Awassi breed in the summer) to 9.67x1012/l (for East Friesian sheep in the autumn). A significant effect of the two evaluated factors on the dynamics of the index discussed was observed, but the share of seasonal variability (20,57%) was considerably higher.
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