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Whole blood consists of plasma (~54%) and various types of circulating cells (~46%) with a very low percentage of cells other than erythrocytes (Jones and Allison, 2007). The main ester-lipid components of blood are triacylglycerols, cholesterol esters and glycerophospholipids. The concentrations of essential elements (like Se, Zn, Cu, Co, Fe or Mg), fatty acids (FAs), vitamins or cholesterol in plasma and circulating blood cells as well as in other mammal tissues vary due to different physiological factors (i.e. dietary intake, intestinal absorption, metabolism and exchange among compartments) (Kincaid, 1999; Risé et al., 2007; Juniper et al., 2008; Niedźwiedzka et al., 2008; Czauderna et al., 2010). ABSTRACT. The concentration of macro and trace elements, fatty acids (FAs), vitamins, total cholesterol (TCh) in blood as well as in other tissues can be modulated by diet composition. Thus, the purpose of the present study was to evaluate the effects of fish oil (FO), carnosic acid (CA) and selenized-yeast (SeY) or selenate (SeVI) on concentration of FAs, TCh, α-tocopherol (αT) and selected elements in whole blood of lambs. Thirty male lambs were allocated into 5 groups of 6 animals each and fed for 35 days the following diets: control – basal diet (BD) with 3% rapeseed oil (RO), ROFO – BD with 2% RO and 1% FO, CA – BD with 2% RO, 1% FO and 0.1% CA, CASeY – BD with 2% RO, 1% FO, 0.1% CA and 0.35 mg Se as selenized-yeast (SeY) per kg of BD and CASeVI – BD with 2% RO, 1% FO, 0.1% CA and 0.35 mg Se as sodium selenate (SeVI) per kg of BD. In animals fed CASeVI diet the levels of saturated (SFAs), monoand polyunsaturated FAs, thrombogenic-SFAs and atherogenicSFAs decreased in comparison to the control group. On the other hand, in lambs fed CASeY diet the concentration of TCh in blood increased in comparison to lambs fed CA and CASeVI diets. Moreover, feeding CASeY diet also enhanced the concentration of αT in blood as compared to the animals fed ROFO and CASeVI diets. The lowest αT concentration in blood was noted in blood of lambs fed CASeVI diet. Feeding diets supplemented with SeY or SeVI increased the concentrations of Se and malondialdehyde in blood in comparison to other diets. So, the whole blood can be treated as the valuable non-invasive marker for evaluation of ruminant health status and nutritional quality of ruminant feeds. Received: 2 March 2017 Revised: 5 June 2017 Accepted: 8 September 2017

Selenium supplementation into diets containing carnosic acid, fish and rapeseed oils affects the chemical profile of whole blood in lambs