Harbers, L.H.; Sapienza, D.A.; Schwanke, L.; Kazemi, S.M.; Smith, E.F.
(Kansas State University. Agricultural Experiment Station, 1981)
We used steers with esophageal cannulas to measure selenium in burned and
unburned bluestem pastures between May and September. Individual variation
among steers sampled varied as much as two fold in selenium content. ...