Digestibility - Department of Animal Sciences

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Alternatives to Tilley & Terry 1. Rumen fluid – Neutral detergent (Van Soest, 1967) – More akin to true digestibility – Gives higher digy. values – Still requires rumen fluid 2. Feces – Gives lower digestibility estimates 3. Enzyme- based assays
Prediction <strong>of</strong> DMD in vivo from in vitro fecal liquor DMD Spp. <strong>of</strong> feces donor r 2 range Ovine 0.33 – 0.98 Bovine 0.77 – 0.97 Equine 0.90 Caprine 0.96-0.97 (Ohmed et al., 2001)
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 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: Rumen fluid technique - problems St
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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