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Lipid metabolism in the rumen significantly influences compositions of fatty acids (FA) in ruminant tissues (Demirel et al., 2004). A small part of dietary FA is catabolised to volatile FA (VFA) or to CO2 (Buccioni et al., 2012). Ruminal microbes are able to synthesize FA and to biohydrogenate free unsaturated FA (UFA) into corresponding saturated configurations. Dietary lipids can be largely hydrolysed by enzymes of ruminal microbes (Buccioni et al., 2012). Ruminal lipolysis results in release of free FA from lipids to allow biohydrogenation of free UFA into intermediates (e.g., C18:2, C18:1 or C18:1) or finally into C18:0. Thus, ruminant meat is considered to be less healthy due to its relatively low contents of polyunsaturated FA (PUFA) and high concentrations of saturated FA (SFA) which stand behind several diseases such as obesity, cancer or ABSTRACT. The aim of the study was to evaluate the effects of highly selenized yeast (SeY) or selenate (SeVI) on fatty acids (FA) profiles in and of male lambs. Lambs, divided into 3 groups of 6 animals each, were individually penned and fed for 35 days control diet containing 2% rapeseed oil (RO), 1% fish oil (FO) and 0.1% carnosic acid (CA) or experimental diets with additional 0.35 mg Se as SeY (the organic Se-form) or SeVI (the inorganic Se-form) per kg of the control diet. In lambs fed SeVI diet body weight gain after 21 and 35 days of feeding was increased; whereas in lambs fed SeY diet increased concentrations of C14:0, C16:0, C18:0, and the sums of atherogenic saturated fatty acids (SFA), thrombogenics SFA and all FA in and were noted. The content of t11C18:1 in and was higher in lambs fed SeY and SeVI diets but the concentration of sum of long-chain polyunsaturated FA in was decreased in comparison to the control group. The sum of conjugated linoleic acid isomers (ΣCLA) content in was higher in SeY group in comparison to the control group. In both examined groups ΣCLA content in was higher in comparison to the control group. In conclusion, the addition of inorganic or organic Se-chemical form into lambs’ feed based on RO, FO and CA differently modifies body weight gains as well as FA profile in examined muscles. Received: 3 November 2015 Revised: 16 May 2016 Accepted: 26 August 2016

Selenium species in diet containing carnosic acid, fish and rapeseed oils affect fatty acid profiles in lamb muscles