ANSC 330 Lecture Notes - Lecture 2: Bulk Density, Wet Chemistry, Electrical Resistivity And Conductivity
Document Summary
Physical characteristics: color, smell, texture, viscosity, poise or pascal-seconds, bulk density. Nutrient content: why nutrient content matters. Nutrient content has historically been evaluated using a procedure known as proximate analysis. Advancements in the field of nutrition have led to the addition of more precise techniques to quantify nutrient composition. Evolved to a combination of proximate analysis and other more specific analytical methods: types of analyses. Direct: uses chemical methods to extract certain nutrients, commonly referred to as wet chemistry . Indirect: uses physical characteristics to predict or estimate nutrient content. Can use nir as an alternative to wet chemistry methods. Require wet chemistry on many samples to develop and validate a reliable prediction model. Only works well on pure ingredients and forages. Does not work well for a complete ration or feed: nir vs. Advantages of nir: faster and cheaper, removes human error. Disadvantages of nir: not as precise as wet chemistry, only as accurate as the prediction model, water.
