Protein

Question 1

biological value is? and what is it equal to

Answer 1

Biological value = absorption + retention

= proportion of absorbed dietary protein, retained by tissues of an animal

Question 2

Biological value depends on?

Answer 2

balance of essential aa

Question 3

which species is biological value more important

Answer 3

more important in monogastrics whereas ruminants use microbial protein synthesised by rumen

Question 4

what is the first limiting animo acid?

Answer 4

lysine

methionine + cysteine, sometimes Threonine/trytophan in grains

Question 5

sheep protein wool deficiency

Answer 5

low protein efficiency in sheep as wool has high Met and Cys = aa imbalance as

Question 6

how to calculate Crude protein

Answer 6

N x 6.25

Question 7

Protein meal

Answer 7

approx 70% CP (700g/kg DM) (organic matter = 0.16N)

Question 8

MCP requirement

Answer 8

Microbial crude protein
9g MCP/MJ FME maintenance
10g growth
11g lactation (ERDP/FME must >9kg)