The effect of the defoliation height of semi-natural grassland on the nutritive value of fresh and fermented forage

Cilj ovog diplomskog rada bio je utvrditi hranjivost svjeţe i fermentirane biljne mase poluprirodnog travnjaka obzirom na različite visine defolijacije. Prvi porast biljne mase je skinut na 3 različite visine defolijacije: A tretman (0 cm), B tretman (6 cm) i C tretman (13 cm). Nakon provedenog istraţivanja utvrĎeno je da se višom defolijacijom biljne mase poluprirodnog travnjaka (13 cm) postiţe značajno niţi udio organske tvari (OT) u fermentiranoj biljnoj masi, u odnosu na niţu defolijaciju (0 i 6 cm) (P<0,05). Udio sirovih proteina (SP) se statistički značajno povećavao s povećanjem visine defolijacije, pa je najveći udio SP zabiljeţen kod najviše defolijacije (13 cm), a najniţi udio SP kod najniţe defolijacije (0 cm) (P<0,001). Količina ME, rezidua šećera i probavljivost OT u ST (D- vrijednost) se statistički značajno povećavala s povećanjem visine defolijacije sa 6 na 13 cm (P<0,05). Razgradivost SP se značajno smanjivala s povećanjem visine defolijacije (P<0,05).The aim of this graduate paper was to determine the effect of the defoliation height on the nutritive value of fresh and fermented forage originated from semi-natural grassland. The study consisted of 3 treatments, i.e. defoliation heights: A treatment (0 cm), B treatment (6 cm) and C treatment (13 cm). Following the study, it was found that higher defoliation of semi-natural grassland (13 cm) resulted in a significantly lower organic matter (OM) concentration in the fermented forage, compared to the lower defoliation (0 and 6 cm). The proportion of crude protein (CP) increased significantly as the defoliation height increased (P<0,001). The concentration of metabolic energy (ME), sugar and the digestibility of the OM in the dry matter (D-value) increased with the increasing defoliation height from 6 to 13 cm (P<0,05). Degradability of CP decreased significantly with increasing defoliation height (P