The objective of this study was to determine the differences between the healthy Holsteın-Friesian, Jersey, Simmental, and Aberdeen Angus breeds Beta-hydroxybutyrate (BHBA) levels at the first three weeks after calving. The blood samples were collected for analysis between 10-20 days postpartum. In this study, 80 animals were used in different regions in total. BHBA was analyzed by Ketosite®( Ketosite®, Stanbio Labrotory Inc., Boerne, TX USA). Milk fat and protein levels were immediately measured by an electronic milk analyser (Milkoscan FT1 FOSS industries, Denmark). Statistical analyses of the study were performed using Sigma Plot 12 ( Systat Software Inc., San Lose, CA). The means of BHBA levels were compared by One Way Anova. As in Holstein cows, blood BHBA levels increased in the early lactation period and also in other breeds. The results of this study presented that serum BHBA levels were significantly higher in Holsteın-Friestein cows than in Simmental and Aberdeen Angus cows.

Blood glucose level is one of the most commonly used parameters in assessing the energy metabolism in dairy cows. The presented study aimed to compare the glucose concentrations in blood samples taken from the coccygeal vein, jugular vein, and mammary vein from the same animals at the same time. Healthy Holstein-Friesian dairy cows (n=25) in their second and third lactation were selected for the study. The blood samples were taken from the coccygeal vein, jugular vein, and V. subcutanea abdominis (mammary vein) at the same time from each animal. To analyze blood glucose, Free Style Optium Blood Glucose Test Strip (Abbott, Istanbul, TURKIYE) was used. In comparison to the blood taken from both the jugular vein and coccygeal vein, glucose levels in blood samples taken from the mammary vein were significantly low (P