Gerber method use for fat content  in milk , you take Gerber tube and 10 ml from milk add 11 ml sulphic acid and 1 ml amel alcohol  and centrifugeat 1100 rpm for 15 min

Khjldel method for proteins content in milk

but you can use lactoflish tool It give all compositions of milk and it need one min.

thank you dear Alla

Gerber method for fat and Khildal method for protein are ok but you can see on the A.O.A.C. methods (even on line) if you want to know other methodologies, maybe easier.

Best regards, CR

If you mean main contents of milk then use a milko scan to analysis milk constituents. For protein analysis you must employ SDS-Page or western blot techniques. For more general analysis try to assess the compounds using AOAC methods. 

You can easily follow the AOAC Protocols.

 you can determined contents of milk by use a milko scan to analysis milk constituents.For more general analysis try to assess the compounds using AOAC methods. 

I also strongly agreed Prof. Samir Ahmed Salem & Prof. Alaa Kareem Niamah