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Year :	1995
Tome :	146
Volume :	6
Pages :	407-412
Title :	Ketone bodies and serum transaminase activities in relationship to milk yield, cortisol, glucose and non-esterified fatty acids in dairy cows
Authors :	T.M. GUEORGUIEVA and I.P. GUEORGUIEV.
Summary :	An experiment with two groups of 6 dairy cows was performed to investigate the ketone bodies concentrations and the serum activities of alanine aminotranspherase (ALT) and aspartate aminotranspherase (AST) around parturition and during early lactation in relationship to milk yield, cortisol, glucose and non-esterified fatty acids (NEFA). In cows with average daily milk yield 23,3 ± 0,68 kg the ketone bodies levels were significantly higher than in cows producing average 14,5 ± 0,45 kg of milk daily. Ketone bodies correlated significantly negatively with cortisol and glucose and significantly positively with NEFA in high yielding cows only. ALT conrelated positively with ketone bodies and milk yield in high and low producers. In high yielding cows AST correlated positively with ketone bodies and NEFA. In the two groups serum transaminases were related negatively to glucose, but were not closely related to cortisol.
Keywords :	ketone bodies - alanine aminotranspherase - aspartate aminotranspherase - dairy cows.
Correspondence :	T.M. GUEORGUIEVA
Adress :	Department of Biochemistry, Higher Institute of Zootechnics and Veterinary Medicine, 6000 Stara Zagora, Bulgaria