ADM: Understand Your Feed Analysis Report - AgroMedia

1R1:1 Understand your feed Analysis ReportProtein fractionsOne of the first values most of us look for whenwe receive a forage Analysis Report is CrudeProtein (CP) %. Since most feed proteins containabout 16% nitrogen (N), CP % is estimated in thefeed lab by measuring the % of N in the feed andmultiplying that value by - the inverse of 16%(1 / = ). However, some portion of theN in most feeds is found as non-protein nitrogen(NPN) and, therefore, the value calculated bymultiplying N x is referred to as crude ratherthan true protein (see article 1P1).Most feed labs will also measure the levels ofseveral subfractions of crude protein that can beuseful in formulating dairy rations. One of thesefractions is acid detergent insoluble protein (ADIP%), used to estimate the amount of protein whichis unavailable to the animal due to heat silage is put up too dry (greater than 50%dry matter) or hay too wet (less than 85% drymatter), excessive heating may cause some of theprotein to become irreversibly bound to severity of damage is estimated in the feedlab by measuring the amount of crude proteinassociated with the acid detergent fibre (ADF)fraction.

1R1:2 The Dairy Extension Advisory Group encourages the distribution of Alberta Dairy Management articles but requests that permission for direct reference to or use of these articles be obtained in writing.

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