Particle passage kinetics in dairy cows was assessed using acid detergent fi bre (ADF) associated 15 N as an internal marker and chromium (Cr) mordanted grass silage, ytterbium (Yb) labelled grass silage and dysprosium (Dy) labelled faecal particles as external markers.Kinetic parameters were estimated using two-compartment models assuming gamma time-dependent (G3) passage rate in the fi rst compartment and age-independent (G1) in the second compartment.Parameter estimates were consistent between ADF-15 N and Cr, but for Yb and Dy the total mean retention time and retention time in the age-independent compartment was shorter.
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Ahvenjärvi et al. (2004) studied this question.
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