Week 8: Protein Systems Flashcards
1
Q
How to calculate crude protein?
A
CP = N x 6.25
- most of N requirements of animals is used for protein synthesis, and most N in plants present as protein
2
Q
What to assume when calculating CP?
A
All food N part of protein
All food protein contains 16%N
3
Q
What is digestible crude protein determined by?
A
Digestibility trials
4
Q
What does endogenous N include?
A
saliva N bile N gastric secretion N pancreatic N sloughed gut mucous membrane cells bacterial N
5
Q
How do you determine endogenous N ?
A
Using labelled 15N in feed
- non radioactive stable isotypes
- known concentration of 15N in diet
- proportiong of 15N in diet
- difference = endogenous N
6
Q
What also affects amount of endogenous N?
A
fibre in diet and protein status of animal
