Evaluating ration / managing nutrition

Question 1

Basics of nutrition

Answer 1

• nutrient supply
  – feed intake
  – diet composition
• nutrient demand
  – mins/vits
  – protein
  – energy

Question 2

Nutrient requirements - maintenance energy

Answer 2

• ~10 MJ ME/day per 100 kg lwt

Question 3

Nutrient requirements - energy for lactation

Answer 3

• ~5 MJ ME/litre

Question 4

Nutrient requirements - energy for pregnancy

Answer 4

• ~20 MJ ME/d @dry off
• ~45 MJ ME/d @ calving

Question 5

Nutrient requirements - energy for weight change

Answer 5

• ~35 MJ ME/kg gain
• ~-20 MJ ME/kg loss(during lactation)

Question 6

Dietary fibre

Answer 6

• not a nutrient but ruminants need a forage-based diet to maintain rumen health

Question 7

Protein

Answer 7

• complex
• usually done by computer