(Basic Nutrients) Dry Matter and As Fed Conversions

Question 1

True or False:
All feeds contain some water in practical feeding situations

Answer 1

True

Question 2

If we want to compare the nutritive value of feeds that vary in moisture content, what must we do?

Answer 2

The composition of the feed must be expressed on a “dry matter” or moisture free basis

Question 3

Explain:
As fed

Answer 3

This refers to feed as normally fed to animals

Question 4

On an __ ___ basis, feed may contain from __% water for lush ________ to __% water for ______ grains

Answer 4

As fed
90
Pastures
10
Cereal

Question 5

Explain:
Dry matter

Answer 5

That part of a feed, which is not water

Question 6

How is dry matter computed? State the formula

Answer 6

Computed by determining the percentage of water and subtracting the water content from 100%

% Dry matter - 100% - % Water

Question 7

On a dry matter basis, how much water does the feed contain?

Answer 7

0% water

Question 8

Determine the dry nutrient percentage based on the as fed nutrient percentage and dry matter percentage (state the formula)

Answer 8

% nutrient (dry)
=
(% nutrient (as fed) / % dry matter) * 100

Question 9

Determine the as fed nutrient percentage based on the dry nutrient percentage and dry matter percentage (state the formula)

Answer 9

% nutrient (as fed)
=
% nutrient (dry) * (% dry matter / 100)

Question 10

Determine the amount of dry feed based on the amount of as fed feed and dry matter percentage (state the formula)

Answer 10

amount feed (dry)
=
amount feed (as fed) * (% dry matter / 100)

Question 11

Determine the amount of as fed feed based on the amount of dry feed and dry matter percentage (state the formula)

Answer 11

amount fee (as fed)
=
(amount feed (dry) / % dry matter) * 100

Question 12

How many useful rules are there in determining dry and as fed nutrients?

Answer 12

3

Question 13

What are the useful rules in determining dry/as fed feed nutrients? (3)

Answer 13

The percentage of a nutrient on a dry matter basis will always be higher than it will be on an as fed basis
The amount of feed on a dry matter basis will always be lower than the amount of feed on an as fed basis
When a nutrient is expressed in units such as lbs, grams, or calories (amounts) it is not changed by moisture corrections

Question 14

True or False:
The percentage of a nutrient on a dry matter basis will always be higher than it will be on an as fed basis

Answer 14

True

Question 15

True or False:
The amount of feed on a dry matter basis will always be higher than the amount of feed on an as fed basis

Answer 15

False, the amount of feed on a dry matter basis will always be LOWER than the amount of feed on an as fed basis

Question 16

True or False:
When a nutrient is expressed in units such as lbs, grams, or calories (amounts) it is changed by moisture corrections

Answer 16

False; When a nutrient is expressed in units such as lbs, grams, or calories (amounts) it is NOT changed by moisture corrections