In the
experiment of digestibility, attempts are made to find out the digestibility
coefficient of the feed as a whole or some constituent of the feed.
Digestibility coefficient may be said to be as the percentage of the total
amount consume which digested and absorbed. The general calculation of digestion
coefficient (DC) can be shown in an equation as follows:
DC of
nutrient = kg nutrient eaten - kg nutrient in faeces/kg nutrient eaten,
multiply by 100/1.
The above
formula is useful whenever there is no residual feed. The normal formula for
the calculation of DC in which the nutrient in the residual is deducted from
the feed offered is as follow:
DC of
nutrient = (kg nutrient offered – kg nutrient refused) – kg nutrient in
faeces/kg nutrient offered – kg nutrient refused.
Computations
are made independently for each experimental animal and how average coefficient
is then calculated. It has now become customary to report coefficient of the
whole organic matter in the feed or ration along with the usual coefficient of
nitrogen free extract and EE (ether extract).
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| Animals digestibility |
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