14. Measuring Feed Intake - Department of Animal Sciences ...

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Internal markers• Main problem is getting a representative sample<strong>of</strong> what is grazed.• Most investigators have concluded that it isvirtually impossible to accurately, representativelysample what an animal eats from a pasture byhand.
Internal markers• E.g lignin, AIA, silica, fecal N, indigestible NDF,chromogens (indigestible plant pigments)• Main problem is getting representative sample <strong>of</strong>what is grazed.• Options– Manual selection (subjective)– Use oesophageally cannulated animal (saliva /rumen fluid contamination)
Page 1 and 2: Measuring feed intakeDr Adegbola T.
Page 3 and 4: Determining intake in confinedanima
Page 5 and 6: Zero grazing criteria• Representa
Page 7 and 8: Calan gatesBruno’s website
Page 9 and 10: Calan gates at the BRU
Page 11 and 12: Hoko feeder
Page 13 and 14: Determining intake fromartificial p
Page 15: Quantifying intake from bite sizeBi
Page 18 and 19: Turves:Method• Sow trays or cut f
Page 20 and 21: Measuring intake at pasture
Page 22 and 23: Herbage mass measurements:Method•
Page 24 and 25: Herbage measurements:Pros• No ani
Page 26 and 27: Short-term BW measurements:Pros•
Page 28 and 29: Vibracorders• Procedure-Works lik
Page 30 and 31: Watch what you eat!!!!Python regret
Page 32 and 33: Total feces collection:Procedure•
Page 35: MethodMarkers:• Avoids the need f
Page 39 and 40: External Markers - chromic oxide:Pr
Page 41 and 42: Markers - Alkanes• Main component
Page 43 and 44: Markers - Alkanes:• Straight chai
Page 45 and 46: Measuring intake with alkanes:• D
Page 47 and 48: Alkane analysis• Alkanes in a sam
Page 49 and 50: Fecal index methods• Based on inv
Page 51 and 52: Accurate representative sampling de
Page 53 and 54: Diet selection:Factors affecting di
Page 55 and 56: Snip samples:Method• Cut or pick
Page 57 and 58: N-alkane markers:Principle-Alkane p
Page 59 and 60: Fecal analysis:Method• Collect fe
Page 61 and 62: GIT contents:Method• Shoot/kill a
Page 63 and 64: Conclusion:There is no right answer

14. Measuring Feed Intake - Department of Animal Sciences ...

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