Abstract
Summary
The ratios of urinary coproporphyrin isomers were found to differ significantly in normal Holstein-Friesian cattle and in those known to be heterozygous or homozygous for the porphyric trait. The average percentages of type I isomer for these 3 groups respectively, were 49.6 ± 6.6, 65.8 ± 2.5, and 89.5 ± 8.3.
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