Feeds are not of constant composition. Unlike chemicals that are “chemically pure” and thus have a constant composition, feeds vary in their composition for many reasons. So, what is the value of showing composition data for feeds?
An actual analysis of a feed to be used in a diet is much more accurate than the use of tabulated composition data. Actual analysis should be obtained and used whenever possible, but it’s often difficult to determine actual composition in a timely way. Thus, tabulated data are the best source of information.
What is the nutritional value? Here is the updated typical composition of 280 feedstuffs commonly fed to cattle and sheep.
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