Abstract
Fourteen male dairy calves were used in two experiments to study the possible effects of phenylhydrazine, given in oral doses varying between 100 and 800 mg per calf per day, on blood hemoglobin concentration, total red cell volume and on the color of four thigh muscles. It appeared that, within a week, a dose of 300 mg or more could cause a drop in both hemoglobin and total red cell volume. Doses of 600 mg or more were lethal. Sudden changes in blood hemoglobin and total red cell volume were not accompanied by corresponding changes in the color characteristics of the gastrocnemius, vastus lateralis, rectus femoris or gluteus medius.
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