“U.S. Origin” serum is collected in facilities located within the contiguous United States of America undergoing continuous inspection by the United States Department of Agriculture (USDA). “USDA Origin” serum is collected from facilities located outside the U.S. which are approved for the import of ruminant meat products and byproducts. Current eligible countries that may export bovine serum into the U.S. can be found on the USDA website. https://www.aphis.usda.gov/aphis/ourfocus/animalhealth/animal-and-animal-product-import-information/animal-and-animal-products-imports.
Why may U.S. and USDA Origin serum behave differently? The characteristics of U.S. origin serum and USDA origin serum may vary with particular applications. In the U.S. and other large-volume producers, most of the cattle are raised on feedlots. Feedlots are the final stage of production before slaughter, focusing on the growth of the animals. In many Latin American countries, animals are left out in pastures or open range. The serum’s chemistry profile can vary in these situations, which is why end users may see different results with a specific source.
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