Digestibility

Question 1

How is apparent digestibility calculated in general terms?

Answer 1

(Intake - Output) / Intake

Question 2

How is true digestibility calculated in general terms?

Answer 2

[Intake - (Output - microbial/endogenous output)] / Input

Question 3

How is total digestible nutrients (TDN) calculated?

Answer 3

Digestible CP + digestible CHO + (2.25 x digestible ether extract)

Question 4

What are the differences between the Tilley and Terry method and Jones and Hayward method of reproducing digestion in vitro?

Answer 4

T&T: Step 1 is treated with buffered rumen fluid from an animal donor, step 2 is treated with pepsin HCl
J&H: Step 1 is treated with pepsin HCl, step 2 is treated with cellolytic enzymes (Doesn’t require live animals)

Question 5

Do cows or sheep digest low quality roughage better?

Answer 5

Cows

Question 6

Do cows or sheep digest cereal grains better?

Answer 6

Sheep