seventy-two hereford x simmental cows , averaging 498 kg in body weight and 5.2 yr of age , were used in a 2-yr study to ascertain if selenium ( se ) -vitamin e ( e ) injections and winter protein supplementation would affect growth , reproduction and health of beef cattle maintained year-round on feedstuffs marginally deficient in se ( .03 to .05 mg/kg ) .
C0935773
selenium
C0036581
se