DL-Selenomethionine (DL-SeMet) consists of 40 % selenium, an essential trace element. DL-SeMet. It was tolerated by chickens for fattening at up to 1.5 mg selenium supplemented/kg feed; DL-SeMet is therefore safe for chickens for fattening provided total dietary selenium does not exceed 0.5 mg/kg complete feed; this conclusion is extended to all animal species.
