Changing pattern of minerals in tropical forages at different maturity
1992
Pravee Vijchulata (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Animal Science)
Experiment was conducted to investigate the status of minerals as well as dry matter, protein and lignocellulose contents of guinea, para and ruzie grasses grown in the Pak Chong soil series at Amphoe Muak Lek, at 3, 5, 7 and 9 weeks of maturity. Dry matter and protein contents are significantly influent (P.01) by grass species, maturity and interaction between the two parameters. It is observed that dry matter and protein of grasses decrease (P.01) while lignocellulose increases with maturity. Significant effects (P.05) of grass species, maturity and interaction between the two parameters on the concentration of different minerals are also found. With the exception of K and Fe, the concentration of Ca, P, Mg, Na, Cu, Zn and Mn differ (P.05) among grass species. With increasing maturity, the concentration of Ca, P, Mg, Na, K and Mn in the grasses decreases while that of Fe and Zn increases (P.05). Considering the daily requirement the various minerals of dairy cows, it is evident that Ca and Cu in all grasses, Zn in guinea and para grasses and Na and Mn in ruzie grass grown in this area are dificient.
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