Abstract
Summary
Four comparisons (10 sera in each comparison) were made of the SPI content of Jersey and Aberdeen Angus sera. The average SPI of the Jersey sera was 5.0 μg %, whereas that of the Aberdeen Angus sera was 4.2 μg %. In a comparison of Jersey and Brown Swiss sera the former was found to be higher in PBI than the latter, 4.6 and 3.7 μg % respectively; the average BEI of the sera, however, was identical (2.5 μg %). The range of SPI for Jersey and Brown Swiss heifers was so great that no comparison is justified; the average BEI was 2.5 μg % and 3.9 μg % respectively.
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