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Selenium (Se) is a trace mineral that is essential for living organisms but required only in small amounts. Se is incorporated into proteins to develop selenoproteins, some of which are important antioxidant enzymes. The antioxidant properties of selenoproteins help to prevent cellular damage from free radicals. Rayman (2008) assumed that the additional health benefits of Se, such as improved immune system and reduced cancer risk, require higher than recommended daily intakes. The content of Se in food depends on the Se content in the soil where plants are grown or animals are kept. Bitterli et al. (2010) reviewed that common soil Se concentrations range between 0.1 and 5 mg · Se kg−1 (average around 0.4 mg · Se kg−1 of soil dry matter). Many regions worldwide are characterized by low amounts of Se in the soil, ABSTRACT. In the Czech Republic, low soil selenium (Se) contents followed by insufficient soil-plant-animal transport of this element have been previously reported. Therefore, the attention of animal nutrition experts should be focused more intensively on the Se status in grazing animals. The experiment was carried out on 42 horses from two locations, A and B (21 animals per group), where the animals are used for sport or recreational purposes, respectively. The Se contents in soil, selected plants, individual components of the diet and animal whole blood were determined. The soil Se contents varying between 0.233 and 0.507 mg · kg−1, confirmed low Se contents in the Czech soils. Similarly, the Se contents in plants were low and did not exceed 0.07 mg · kg−1 of dry matter (result of low Se mobility in the investigated soils), whereas the levels of other essential micronutrients, such as copper, iron, manganese and zinc, occurred in the sufficient concentrations. The Se contents in the whole blood of animals varied between 0.044 and 0.215 mg · l−1 and were comparable with the results of many other similar studies conducted across the Europe. The adequate Se status in animals can be strongly related to the high Se contents in complementary feedstuffs such as pellets and muesli, whereas feeding animal diets based only on roughage and grain produced at the investigated farms could be Se deficient. Therefore, the supplementation of horse diet with Se is recommended in the Czech Republic. Received: 22 December 2014 Revised: 18 August 2016 Accepted: 10 December 2016

The soil-plant-feed transport of selenium and other essential micronutrients in diet of sport and recreational horses at two different locations