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Ranchers.net
I found this study a while back on how the quality of colostrum declines after the cow has calved. We all know that the ability of the calf to absorb antibodies declines as time goes on, but I had always wondered about the colostrum the cow produces.
http://www.calfnotes.com/pdffiles/CNCE0108.pdf
Another good article about colostrum
http://beef.unl.edu/stories/201012230.shtml