DYNAMICS OF THE HEMATOCRIT IN SHEEP BLOOD. II. SEASONAL DIFFERENTATION. INTERACTION OF BREED AND SEASONAL CHANGEABILITY

Katya Tsenova, Krasimir Boychev

Abstract: The aim of the study was to evaluated the seasonal differentiation of hematocrit in sheep blood and to analyzed the role of the interaction of breed appurtenance and season in the structure of total variability of the haematological parameter discussed. Three hundred and ninety eight animals of four breeds (Awassi, East Friesian, Pleven black – headed, Romanov) and Syntetic Population Bulgarian Dairy sheep were included in the experiment. The blood samples were taken in April, July, November and February. The hematocrit was determined by microcentrifugal method. A very important effect of the season was registered for Synthetic Population, Awassi and Pleven black – headed breeds (40.99 – 51.65%). The basic part of the total factor’s effect for the two evaluated sources of variation of the hematocrit (36.92%) was associated with the interaction of both factors – 22.63%, P < 0.001.

Keywords: breeds; hematocrit; interaction of both factors; seasons; sheep blood; sources of variation

Date published: 2023-02-28