الفهرس 
introduction
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Abstract
Casein micelles of different sizes were prepared from buffalo’s, sheep’s and cow’s milk by differential centrifugation. Large, medium and small casein micelles (LCM, MCM and SCM) as well as serum casein (the remaining non-sedimented casein) were analyzed for their contents.of KB-, B- and K-casein, calcium, magnesium and phosphorus and amino acids composition. Calcium sensitivity of all casein micelles were also tested in the presence of different concentrations of calcium ions. The attained results can be summarized as follows: 1. Herd bulk samples had the following values for casein fractions of milk from different species: ( A ) : The a,- contents of LCM, MCM and SCM from buffalo’s milk were 53.42, 53.43 and 53.64% in order. The corresponding values of B-casein were 44.13, 41.29 and 38.88% and of K-casein were 2.45, 5.28 and 7.48%. respectively. Generally, the differences in all casein fractions were insignificant. (B): The ar,-casein values of LCM, MCM and SCM from sheep’s milk were 50.57, 48.60 and 42.48% in order.