Abstract
This study was conducted in 165 cattle belonging to Brown of the Atlas native breed, and the imported Holstein, Montbeliard and Brown of the Alps breeds, and their crosses with the local breed; it aims at revealing the influence of the breed on the morphometric parameters of red blood cells. Blood samples were taken from the jugular vein; smears were confectioned on slides immediately after the blood collection and May-Grundwald Giemsa dye stained. For the morphometric study, we considered the diameter, the circumference and the surface of erythrocytes; measurements were achieved using special software OPTIKATM Vision Pro. Statistical analysis of the data was performed using ANOVA. The recorded results showed that the diameter of the red blood cells is significantly higher (p<0.01) in the local (5.00±0.22) and cross (4.98±0.12) males; however, in females, the diameter of erythrocytes was significantly higher (p<0.01) in indigenous (5.23±0.10) and Brown of the Alps (5.32±0.19) breeds. In addition, the circumference of erythrocytes is larger (p<0.05) in males of Pie-Black Holstein (19.09±1.14) and Montbeliard (19.70±0.86) breeds; whereas in females, the erythrocyte circumference was significantly higher (p<0.01) in local cows (20.65±0.55). Similarly, the surface of red blood cells takes significantly higher values (p<0.01) in Pie-Black Holstein (21.18±2.28) and Montbeliard (22.18±1.76) males; however, in females, the surface of the red blood cells of native cattle (24.47±1.30) was significantly higher (p<0.001). The current work allowed us to propose new reference values for the circumference and the surface of erythrocyte in the breeds and the management conditions considered.
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