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Flashcards in Midterm - Lecture 3 Deck (17)
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1
Q

At what temperature is dry matter calculated?

A

60-100 C

2
Q

How is dry matter calculated?

A
  • weigh sample
  • place in an oven 60-100 degrees C overnight
  • weigh again the next day
  • Dry weight/starting weight X 100 = % DM
3
Q

How is fat content calculated?

A

using an ether extraction

the weight before ether extraction - weight after ether extraction

4
Q

What is fat equal to?

A

ether content

5
Q

How is crude fiber calculated?

A
  • reflux extraction of ether extract residue with acid and base
  • it stimulates the passage through the stomach and then the duodenum
  • residue left after this treatment is crude fiber
6
Q

How is crude protein calculated?

A

% nitrogen by Kjeldahl method on a separate portion of the feed sample

7
Q

What is crude protein equivalent to?

A

nitrogen X 6.25

8
Q

Why is the crude protein calculation not exact on the amount of protein in the feed?

A

can give a protein value for things that are not protein such as urea and melamine

9
Q

What is ash?

A

all inorganic material, contains minerals

10
Q

What is Nitrogen Free Extract?

A

NFE = starches and = carbohydrates

11
Q

How is NFE calculated in dry matter?

A

NFE = 100 - % protein - % fat - % ash - % crude fiber

12
Q

How is NFE calculated in as fed?

A

NFE = 100 - % water - % protein - % fat - % ash - % crude fiber

13
Q

What is NFE not useful for?

A

herbivores because it does not take in account the cell walls and cytosol that is present in a herbivores diet

14
Q

How much metabolizable energy do dogs get from the Atwater constant for fat?

A

Atwater = 9.4 kcal GE/g

Metabolizable Energy = 9 kcal ME/g

15
Q

How much metabolizable energy do cats get from the Atwater constant for fat?

A

Atwater = 9.4 kcal GE/g

Metabolizable Energy = 8.5 kcal ME /g

16
Q

How much metabolizable energy do dogs and cats get from the Atwater constant for protein?

A

Atwater constant = 5.7 kcal GE/g

Metabolizable Energy = 4 kcal ME /g

17
Q

How much metabolizable energy do dogs and cats get from the Atwater constant for carbohydrates?

A

Atwater constant = 4.1 kcal GE/g

Metabolizable energy = 4 kcal ME/g