Total tract digestibility of alfalfa hay minerals evaluated by nylon capsule method

Trinacty, J.; Simek, M.; Loucka, R.; Takahashi, J.

Total tract digestibility of alfalfa hay minerals evaluated by nylon capsule method

2000

Trinacty, J. | Simek, M. (Vyzkumny Ustav Vyzivy Zvirat, Pohorelice (Czech Republic)) | Loucka, R. | Takahashi, J.

The aim was to evaluate the total tract digestibility of alfalfa hay minerals by nylon capsule method. The trial was performed on two dairy cows in the second lactation period. The capsules were made of nylon cloth with 42 micro m apertures. The capsule shape was lenticular, with 10mm external diameter and 8 mm internal diameter. The capsules were applied orally in the form of paper bolus. The results showed that 33.2 % of dry matter was lost from the nylon capsules when they were only washed, with the ash it was 66.2 % and with minerals the values were as follows: Ca 31.3 %, P 71.7 %, K 98.4 percent, Mg 80.8 %, Cu 66.0 %, Zn 7.9 % and Mn 46.2 %. Total average values of total tract digestibility of the minerals exceeded 90 % with P (94.6 %), K (99.4 %) and Mg (95.8 %). Ca (78.0 %), Cu (88.0 %) and Zn (77.8 %) represented medium values, the lowest value was measured for Mn (66.5 %).

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