GB/T6432 Determination of crude protein in feed GB/T6435 Determination of moisture and other volatile substances in feed GB/T6438-2007 Determination of crude ash in feed GB/T6682 Analytical laboratory water specifications and test methods DB15/T1458 Silage Methods for determination of pH, organic acids and ammonia nitrogen GB/T20195 Preparation of animal feed samples GB/T20806 Determination of neutral detergent fiber (NDF) in feed NY/T1459 Determination of acidic detergent fiber in feed NY/T2129 Forage products Sampling Technical Regulations Announcement No. 318 of the Ministry of Agriculture of the People's Republic of China Feed Additive Variety Catalog