Problem 4SAQ
Fertilizers commonly contain compounds of which element?
a) nitrogen
b) aluminum
c) fluorine
d) boron
Chapter 2: Feed Analysis Systems 1 – Proximate Analysis Objectives: o Explain components of Proximate Analysis (ash, CP, EE, CF) o Calculate NFE o Limitations of each component o Explain and define Detergent Analysis Proximate analysis components: o Dry matter (DM) o Ash – from this can calculate organic matter (OM); inorganic matter (minerals) Remains after oxidizing sample; in muffle furnace % ash = wt after/sample wt x 100% % organic = 100 - % ash Problems: Doesn’t say individual minerals Some minerals lost when burned (S, Se, Zn, I) Significance: Soil contamination of feed or diet indicated Ca recovered in “ash” residue (mineral) Minerals in “ash” Only thing not in ash - water o Crude protein (CP) Measures N in sample; 2 ways to measure Kjeldahl N – digests protein, acid base titration N analyzer (LECO) – oxidize and combusts sample, filters N out % CP = %N x 6.25 6.25 from the fact that proteins contain 16% N o 100g protein/16g N = 6.25 Can say if sample is contaminated or not