nutrient composition of feed Flashcards
what feeds are usually carbonaceous concentrates
grains
what feeds are usually proteinaceous concentrates
meals
what feeds are usually carbonaceous roughages
grasses
what is the purpose of national research council(NRC)
provide feeding standards for each species
T/F feed composition tables are the same for all NRC publications
FALSE. each species/publication has its own feed composition table
when dealing with percentages how do you convert DM to AF
multiply by % DM
when dealing with weights how do you convert from DM to AF
divide by % Dm
equation for nitrogen-free extract
100-EE-CP-Ash-CF
how do you find crude protein from nitrogen
N x 6.25
what percent nitrogen does protein contain
16
methods to measure nitrogen content
-Kjeldahl-nitrogen method
-leco-nitrogen method
limits of the proximate analysis system
-separation of CHO into CF and NFE is not very accurate
-CF assay recovers less than 100% of the cellulose, hemicellulose and lignen
-
what is removed by the NDF solution in the van soest method
-digestible CHO
-lipid
-protein
-soluble ash
what is part of the NDF fraction of the van soest method
-cellulose
-hemicellulose
-lignin
-insoluble ash
what is removed by the ADF solution in the van soest method
hemicellulose
what is in the ADF fraction of the van soest method
-cellulose
-lignen
-insoluble ash
what is removed by sulfuric acid in the van soest method
cellulose
what is left after the sulfuric acid wash in the van soest method
-lignin
-insoluble ash
advantages of near infrared spectroscopy
-quick results
-less expensive
-simple to operate
-complete all analysis in one operation
disadvantages of near-infrared spectroscopy
-dependent on a good database
-not accurate for minor nutrients
-unable to accurately analyze diets with multiple feeds
-instruments are expensive
-development of databases are expensive
what is the most accurate way to measure digestibility of feed
conventional digestion trail
what is the trend of digestibility as ADF in a feed increases
digestibility decreases
what is the equation to determine digestible dry matter(DDM)
88.9-(%ADF x 0.779)
how to estimate dry matter intake(DMI)
120/%NDF
