Анотация: The purpose of the study was to investigate the effect of supplementing coconut oil to the ration of yearling rams on some clinically important blood biochemical parameters. Nine male Blackhead Pleven yearling rams were used in the experiment, with initial weight of 45.2 kg on the average. The experimental design included two periods. During the first period, the first group of yearling rams received 1 kg barley and 1 kg grass hay (ration I); the second group - 0.800 kg barley, 0,200 kg sunflower meal and 1 kg grass hay (ration II), and the third group 0.800 kg barley, 0.200 kg sunflower expeller and 1 kg grass hay (ration III). During the experimental period, 0.02 kg coconut oil was applied via cannulae at the time of the morning feeding in all groups. The addition of coconut oil to ration II resulted in increased serum total and HDL cholesterol 2.5 h after feeding (р<0.001). Serum triglycerides remained unchanged in animals fed rations I and II, despite the additional amount of lipids introduced in the rumen. IN all three rations, coconut oil decreased significantly serum ASAT activity both prior to feeding (р<0.05) and after feeding (р<0.001). After coconut oil supplementation, serum alkaline phosphatase decreased in animals fed ration II both before (р<0.001) and after feeding (р<0.05)