Functional liver stress in dairy sheep
The aim of this study was to investigate liver function in dairy sheep during summer and consequences made by heat stress. The experiment was performed on 117 Pramenka sheep at two different locations (Travnik and Livno) during summer grazing period (July, August and September). Levels of serum enzymes were determined for alanine aminotransferase (ALT), aspartate aminotransferase (AST)), gamma-glutamyl transferase (GGT), alkaline phosphatase (AP) and lactate dehydrogenase (LDH). Enzyme activities resulted in significant (P<0.05) variation except GCT and a moderate increase followed by dcrease in activity, which is likely to be correlated with the energy balance of animals. Values of serum profile above reference range may indicate intense metabolic processesasaliver response toa negative energy balance. The results of this research couldbeused for the determination ofhealth status.