“The biggest mistake in using a colostrometer incorrectly is to not measure colostrum when it’s at room temperature,” says Sylvia Kehoe, professor of animal and food science at the University of Wisconsin-River Falls. Most people are in a hurry and use the colostrometer when the colostrum is fresh out of the cow, which is a problem because the colostrum tends to be closer to a cow’s body temperature than room temperature. With warmer colostrum, you will get a lower IgG reading because the colostrum is thinner. 

The other mistake is to measure colostrum after it’s been refrigerated, making it colder than room temperature. his causes an overestimation of colostral IgG because the density is thicker and so the colostrometer doesn’t sink as low. 

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