Effects of protein concentration and beta-adrenergic agonists on ruminal bacterial communities in finishing beef heifers. oleh Alison P Pfau, Madison T Henniger, Kendall L Samuelson, Kristin E Hales, Clint A Löest, Mike E Hubbert, Amanda K Lindholm-Perry, Amanda M Egert-McLean, Katie M Mason, Elizabeth A Shepherd, Brynn H Voy, Phillip R Myer