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저널기사
Effects of supplementationof organic and inorganic combinations of copper, cobalt, manganese, and zinc above nutrient requirement levels on postpartum two-year-old cows: / Olson.P.A Brink.D.R Hickok.D.T Carlson.M.P Schneider.N.R Deutscher.G.H Adams.D.C Colburn.D.J Johnson.A.B / American Society Animal Science / Journal of animal science / 1999 /
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