Abstract
1) High sialic acid content existed in bovine colostrum immediately after calving, but was lower than that in human colostrum. The range of percentage of the sialic acid content in com and human colostrum was from 0.88 to 1.38, and 3.25 to 8.26%, respectively.
2) Total sialic acid content in bovine colostrum immediately after calving decreased remarkably with advancing lactation, and a similar tendency was found in acid casein, acid whey, TCA-precipitated protein and TCA-serum.
3) A high dialysable sialic acid content was present in cow colostrum and most of it was dialyzed in 24 hours in distilled water.
4) Protein of the bovine skimmed colostrum was fractionated on DEAE-cellulose column, and 18 fractions were obtained. The sialic acid content in each fraction was determin
