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- [50] Influence of supplemental tocopherol level (0, 250 and 500 IU RRR--tocopherol/d/steer) and injectable retinol form (retinyl propionate vs retinyl palmitate) on growth performance, carcass characteristics and plasma concentration in calf-fed Holstein steers JOURNAL OF APPLIED ANIMAL RESEARCH, 2018, 46 (01) : 1516 - 1521