1. Approved methods of the American association of cereal chemists,2000
2. Solids (total) and moisture in foodstuffs (air oven method). AOAC official method 925.10;AOAC International,2000
3. Ash of animal feed. AOAC official method 942.05;AOAC International,2002
4. Total nitrogen in milk. AOAC official method 991.20;AOAC International,2006