Digestibility - Department of Animal Sciences

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Digestibility indices that estimate energy value Digestible organic matter content (DOMD) (g/kg DM) = OM in feed - OM in feces x 1000 DM in feed TDN = DCP + DCF + DNFE + DEE(2.25) – DCP= Digestible Crude Protein – DCF= Digestible Crude Fiber – DNFE= Digestible Nitrogen-Free Extract – DEE= Digestible Ether Extract (2.25)
2. Difference method Allows digy calculation for 2 feeds fed simultaneously Assumptions – No interaction b/w the digy of the feeds – Must know digy & fecal DM output (DMO) of base feed Test feed DMD = Cons Test feed DMI – (Fecal DMO- Base feed DMO) Test feed DMI – Assumptions may be invalid
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: Total collection calculations Diges
Page 11 and 12: DMD (g/kg) Regression method 800 Ba
Page 13 and 14: Marker digestibility trials Particu
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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