Abstract
Summary Observed values have been presented for the width of the epiphyseal cartilage of the ulna for Holstein and Jersey calves up to 240 days of age. It was wide in young calves and gradually became ossified or “closed” at about 8 months of age. Formulas were derived and presented from which expected values can be obtained at any given age. A significant difference in the cartilage width between breeds and sexes was found at certain ages. There was no seasonal trend or differences in these values for calves born in winter, summer, or spring and fall. Examples are given of the use of this technique in the detection of rickets, in which values for blood calcium and phosphatase were compared to cartilage width in normal and rachitic calves. The use of this technique to determine physiological or skeletal age in young calves is indicated.
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