Abstract: In order to study the different levels of fluoride dietary and selenium interact effect on nutrients digestion and metabolism on sheep,16 healthy Mongolia rams, weight (35.0 ± 1.4) kg, were randomly assigned to a group of four sheep, batch experiments to determine rate of digestion and metabolism of nutrients. Diet 1 helps the body digest and absorb nutrients, diet 1 selenium can promote the excretion of fluorine,can play a detoxification role. Amount of fluorine and selenium intake is conducive to the health of the body, selenium in a certain range of concentration of fluoride toxicity arising from the antagonistic role in enhancing the level of concentrate diet will promote the body's excretion of fluoride and reduce the bioavailability of fluoride, the absorption of diet 1 nutrients can be enhanced.

Key words: fluorine; selenium; digestion and metabolism