Problem 1

The following data was collected about a feedstuff. Calculate the TDN.

Component	%	Digestibility
Water	10	100%
Nitrogen	4	75%
Ether extract	3	80%
Crude Fiber	8	35%
Ash	3	70%
NFE	___	80%

How do I do this? (Don't look too early; you only hurt your ability to figure it out).

Problem 2

Calculate the apprent nitrogen (protein) digestibility and Apparent Biological Value from the following:

N Intake	170 g	% App. N Digestibility ____
N in Feces	35 g	% App. B. V. ______
N in Urine	12 g

What else do you need to know to calculate True N. Digestibility and True Biological Value?

How do I do this? (Don't look too early; you only hurt your ability to figure it out).

Problem 3

From the following data, calculate the DE, ME and Net energy values:

Feed consumed	5 Kg @ 3100 Kcal/Kg
Feed contained	15,500 Kcal	DE, % ______
Feces excreted	1.5 Kg	DE, Kcal/Kg feed ___
Feces contained	2000 Kcal/Kg	ME, % _______
Urine & gas had	1500 Kcal total	Me, Kcal/Kg feed ____
Heat increment	2200 Kcal total	Net E, Kcal/Kg feed ____

How do I do this? (Don't look too early; you only hurt your ability to figure it out).