DYNAMICS OF THE LEVEL OF INORGANIC PHOSPHORUS IN SHEEP BLOOD SERUM II. SEASONAL DIFFERENTATION. INTERACTION OF BREED AND SEASONAL CHANGEABILITY

Krasimir Boychev

Abstract: The aim of the study was to determine the trends in seasonal changeability and the parameters of breed and seasonal interaction in the structure of total variability of the content of inorganic phosphorus in sheep blood serum. Three hundred and ninety animals of four breeds (Awassi, East Friesian, Pleven black-headed, Romanov) and Synthetic Population Bulgarian Dairy sheep were included in the experiment. The blood samples were taken in April, July, November and February. The level of inorganic phosphorus was determined by Boehriner`s tests. The content of the phosphorus varies from 1.948 mmol/l in winter to 1.515 mmol/l in summer. The effect of the season was registered to be very important for all of the investigated populations (31.80 – 61.29%). The basic part of the total factor`s effect for the two evaluated sources of variation of the hematological parameter discussed was associated with the interaction of both factors – 31.76%, P<0.001.

Keywords: breeds; inorganic phosphorus; interaction of both factors; seasons; sheep blood; sources of variation; variability

Date published: 2023-03-07