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Materials and methods: Concentrates containing inorganic minerals: manganese oxide, copper sulphate pentahydrate, zinc oxide and sodium selenite or organic minerals: manganese, copper, zinc chelates of protein hydrolysate, and selenised yeast (Selplex®) were given to 24 individually-penned male Charolais× Suffolk-Mule sheep offered a ration of grass silage: concentrate (60: 40; DM basis of pre-determined 0.9 ad libitum silage DM intake). The concentrates with premixed minerals of 100% or 80% of typical industrial levels of inclusion (IND) were offered for two weeks, with Se offered 0.6 or 0.2 mg-Se/kg-concentrate, respectively, based on the permitted upper-level of organic Se supplement. This resulted in four treatments: organic minerals at higher (OH) or lower (OL) IND and inorganic minerals at higher (IH) or lower (IL) IND. The sheep were allocated randomly into six blocks according to their body weights, and offered silage and different treatments of concentrate in individual feeding buckets. Complete urine and faecal collection was performed separately and individually before the morning feed. The total element analysis of samples was carried out using ICP-MS. An ANOVA model (two-factor factorial design in a randomized complete block) was performed in R software to test the influence of mineral forms and supplementary dose on the response variables. Results: More than 50% of the Se came from the supplementation as opposed to the basal diet (Table 1). The Se partitioning in urine and faeces, as well as retention, was significantly affected by supplementation dose (Table 2). Faeces was the major excretion route (Table 2 …