The content of plant phenolic in meadow grasses and its relation to nutritive value of fodder
2001
Mika, V. | Komarek, P. | Smital, F. | Ostrcilova, V. | Nerusil, P. (Vyzkumny Ustav Rostlinne Vyroby, Jevicko (Czech Republic).Vyzkumna Stanice Travnich ekosystemu)
A total of 436 samples of 109 species of 15 families was collected from grasslands in the area of Jevicko in the period of three years. Prediction of the index of potential negative activity of phenols (IANP) and of the parameters of fodder quality was carried out with a NIR Systems 6500 apparatus. The highest IANP value was determined for Hypericum perforatum at the stage of florescence (232), the lowest for Vicia sepium at the vegetative stage. The IANP of meadow species was significantly higher at the florescence stage than at the vegetative stage, the influence of harvest year was significant in one case. Significant interspecific differences in IANP can be determined more often for families that exhibit higher average value of IANP ( 80), e.g. for Rosaceae, Hypericaceae, Asteraceae, Plantaginaceae. On the contrary, for families with an average value of IANP 50, significant interspecific differences occur occasionally. A significant intraspecific variability was found out for Taraxacum officinale. In the model experiment a standard addition of the extracts of nine meadow plants to test samples of grasses and legumes decreased activity of proteases a cellulases in the digestive liquor. From the practical point of view these effects will have to be studied also in the mixture of botanical species in the rates that occur in mixed grasslands.
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