Influence of chlortetracycline and dietary protein level on plasma somatomedin-C concentration, performance, visceral organ mass, and carcass merit of growing beef steers Baldwin, R.L.V.; Mcleod, K.R.; Rumsey, T.S.; Elsasser, T.H.; Kahl, S. FASEB Journal 12(5): A851 1998 0892-6638 https://eurekamag.com/research/031/919/031919917.php