The foremilk (a thin, yellowish liquid) produced by cows (and other mammals) for the first five milkings after giving birth. Also known as beestings, colostrum is exceptionally rich in antibodies, minerals and vitamins. Bovine colostrum has been credited with health and healing benefits and is sometimes used as a dietary supplement.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.