Comparison of apparent and true digestibility of nutrients determined in dairy cows either by the nylon capsule or in vivo method
Trinacty, J.(Vyzkumny Ustav pro Chov Skotu, Pohorelice (Czech Republic))E-mail:trinacty@vuvz.cz | Richter, M.(Vyzkumny Ustav pro Chov Skotu, Pohorelice (Czech Republic)) | Homolka, P.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Rabiskova, M.(Veterinarni a Farmaceuticka Univ., Brno (Czech Republic)) | Dolezal, P.(Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
Four intact crossbred dairy cows (mean milk yield 21.9 kg/d) fed a total mixed ration (TMR, maize silage, lucerne hay and concentrate) were used in two experimental periods in order to determine true and apparent digestibilities of dry matter (DM), organic matter (OM), crude proteins (CP), neutral detergent fibres (NDF) and starch. The method using nylon capsules was compared with the conventional in vivo method. Nylon capsules (external diameter 10 mm) were made of nylon cloth (pore size 42 microm). They were filled with TMR and administered orally as a paper bolus into the cows at the beginning of the in vivo trial. The values of true digestibility (after washing loss correction) of DM and OM determined using nylon capsules were significantly lower by -6.9 and -7.3%, respectively, than those estimated by the in vivo method. Insignificant differences were found in CP, NDF and starch digestibilities.
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