RELATIONSHIP BETWEEN MILK SECRETION INTENSITY, CORTISOL, GLUCOSE, NONESTERIFIED FATTY-ACIDS AND TRIACYLGLYCEROL IN DAIRY-COWS

An experiment with two groups of 6 dairy cows, differing in milk yield was performed. This study provides the information about high yielding cows ability to adapt toward energy deficiency state in early lactation. Serum cortisol, which was not significantly different between groups, correlated positively with glucose, but was not closely related to milk yield, non-esterified fatty acids and triacylglycerol. Glucose correlated consistently negatively with non-esterified fatty acids. The high yielding cows exhibited lower values of glucose and triacylglycerol and higher levels of non-esterified fatty acids as compared with the low yielding cows.