There is really good information on milk proteins at
http://classes.aces.uiuc.edu/AnSci308/ProteinSyn.html#Major Milk Proteins

I will try to summarize a little of it.

Milk contains the following proteins:

caseins (alpha-casein, beta-casein, kappa-casein, gamma-casein)
beta-lactoglobulin
alpha-lactalbumin
serum albumin
immunoglobulins (G1, G2, A, M)
lactoferrin
lactoperoxidase
lysozyme
beta2-microglobulin (lactolin)


Other information:
Whey proteins are all the proteins left after the casein is removed.
Human milk probably has no kappa casein (see http://www.lsbc.com/papers/abs12.htm)
Beta casein is the major casein in cow milk, but is the minor casein in human milk.
Immunogobulins are high in colustrum, lower in milk.
Human infants are most likely to be allergic to beta-lactoglobulin protein in cow milk.


Thanks everyone for all the information, support and recipes.