Digestibility - Department of Animal Sciences

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Apparent v. true digestibility True digestibility involves correction for endogenous losses, apparent digestion does not. Endogenous losses – Include: • Sloughed <strong>of</strong>f intestinal cells • Digestive juices (enzymes) • Microbial matter – Quantified by measuring fecal output <strong>of</strong> fasted animals – Can be 9.8 to 12.9 % DMI – Should they be quantified?
In vivo digestibility methods Direct or total/complete collection Difference method Regression method Indirect method
Page 1: DIGESTIBILITY
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 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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