Digestibility - Department of Animal Sciences

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Digy trial issues Changeover designs – necessary if period effects are an issue e.g. • Animal physiological changes • Forage physiological changes Adaptation period – Necessary to adapt the animals to • New feed (microbial population changes) • Strange equipment • Strange housing – 6 – 14 day period is the norm
Marker digestibility trials Particularly useful for grazing animals Procedure – Add indigestible marker to feed eg chromic oxide – Measure concentration in feed & feces – Estimate disappearance of marker from gut. E.g. if a feed contains 1% Cr 2 O 3 & feces contains 2% Cr 2 O3, diet digestibility = 50% – Since Cr 3 O 2 conc. has doubled, 50% of DM must have been digested
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: DMD (g/kg) Regression method 800 Ba
Page 15 and 16: Marker digestibility Pros - Total f
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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