DYNAMICS OF THE LEVEL OF INORGANIC PHOSPHORUS IN SHEEP BLOOD SERUM I. BREED VARIABILITY

Krasimir Boychev

Abstract: The aim of the study was to determine the trends of breed differentiation of inorganic phosphorus in sheep blood serum and to evaluate the effect of breed appurtenance in the seasonal variability on the hematological parameter discussed. The experiment was conducted with 390 sheep of 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 inorganic phosphorus was determined by Boehriner`s tests. The role of breed appurtenance in the changeability of the parameter discussed was evaluated by the coefficients of interclass correlation. The mean level of inorganic phosphorus in blood serum of the investigated populations varies from 1.557 mmol/l (for Pleven black-headed sheep) to 1.995 mmol/l (East Friesian breed). The total effect of breed appurtenance on the structure of change- ability of the hematological parameter discussed was 8.73% (P<0.001). A minimal seasonal variability of phosphorus was found for East Friesian sheep. A significant role of the breed on the dynamics of the index discussed was registered in all seasons and particularly in the summer (71.14%) and in the autumn (50.48%).

Keywords: breed variability; inorganic phosphorus; seasonal effect.; sheep blood

Date published: 2023-03-07