Digestibility - Department of Animal Sciences

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Marker trials contd. For the digy of a specific nutrient, must also know the % nutrient in feed & feces %Nutrient = 100 – 100 x % indicator feed X % nutrient feces Digestibility % indicator feces % nutrient feed Homework: If lambs are fed a bahia grass diet containing 7% protein & 1% chromic oxide, and their feces contains 5% CP and 2% chromic oxide. Calculate CP digy.
Marker digestibility Pros – Total feces collection not necessary – Total intake determination not necessary – Easier, less labor Cons – Representative sampling essential – Accurate estimation of nutrient or marker conc. essential – Assumes complete excretion of marker hence Recovery of marker determines accuracy of digy
Page 1 and 2: DIGESTIBILITY
Page 3 and 4: In vivo digestibility methods Direc
Page 5 and 6: In vivo digestibility trials in met
Page 7 and 8: Total collection calculations Diges
Page 9 and 10: 2. Difference method Allows digy ca
Page 11 and 12: DMD (g/kg) Regression method 800 Ba
Page 13: Marker digestibility trials Particu
Page 17 and 18: Marker issues Difficulty of mixing
Page 19 and 20: Ideal in vitro methods should be: -
Page 21 and 22: Prediction of silage OMD in vivo fr
Page 23 and 24: Rumen fluid problems Analytical iss
Page 25 and 26: Rumen fluid technique - problems St
Page 27 and 28: Prediction of DMD in vivo from in v
Page 29 and 30: Relationships between DMD in vivo a
Page 31 and 32: Prediction of in vivo OMD of spring
Page 33 and 34: 14 C-Casein hydrolysis (mg/ml) 0.5
Page 35 and 36: The ANKOM equipment
Page 37 and 38: ANKOM pros & cons Pros - Simplifies
Page 39: Digestibility references Chapters 6

Digestibility - Department of Animal Sciences

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