THE EFFECT OF THE SILAGE ADDITIVE PLANTANAZE® ON THE CHEMICAL COMPOSITION AND IN VITRO DIGESTIBILITY OF DIRECT CUT GRASS SILAGE

Abstract

V laboratorijskih silosih smo testirali učinek silirnega dodatka Plantanaze® , ki vsebuje mlečnokislinske bakterije (L. plantarum, P. pentosaceus) in celulolitične encime, na kemično sestavo in in vitro prebavljivost neovele travne silaže. Silosi so bili odprti po 271 dneh. Silaža z dodatkom Plantanaze® je vsebovala v primerjavi s kontrolo več sladkorjev (32 vs. 11 g kg-1 SS, p< 0,05) ter manj surove vlaknine (284 vs. 295 g kg-1 SS, p< 0,05), celuloze (312 vs. 318 g kg-1 SS, p< 0,05) in ADF (352 vs. 358 g kg-1 SS, p< 0,05). Vsebnost surovih beljakovin, pepela, ADL, NDL in hemiceluloz se niso značilno razlikovale. In vitro prebavljivost OS po Tilleyu in Terryu (1963) je bila pri silaži s Plantanaze® neznačilno večja (65,6%) kakor pri kontroli (64,7%). Neznačilno večja je bila tudi prebavljivost OS, ki smo jo ocenili na osnovi kemične sestave in količine plina pri in vitro inkubaciji vzorcev z vampnim sokom (63,0% vs. 62,2%). Zaradi manjših izgub mase (4,45 vs. 6,97 kg t-1 silirane krme, p< 0,001) in nekoliko vešje koncentracije NEL (5,01 vs. 4,93 MJ kg-1 SS) je bila izguba NEL pri silaži z dodatkom Plantanaze® manjša (3,8 MJ NEL t-1 silirane krme) kakor pri silaži brez silirnega dodatka (62,0 MJ NEL t-1 silirane krme).The effect of the silage additive Plantanaze®, which contained lactic acid bacteria (L. plantarum, P. pentosaceus) and cellulolytic enzymes, on the chemical composition and the in vitro digestibility of direct cut grass silage was tested in laboratory silos. The silos were opened after 271 days. The silage with the addition of Plantanaze® contained in comparison with the control silage more sugars (32 vs. 11 g kg-1 DM, P< 0.05) and less crude fibre (284 vs. 295 g kg-1 DM, P< 0.05), cellulose (312 vs. 318 g kg-1 DM, P< 0.05) and ADF (352 vs. 358 g kg-1 DM, P< 0.05). The concentrations of crude protein, ash, ADL, NDF and hemicelluloses were not significantly different. The in vitro digestibility of OM according to Tilley and Terry (1963) was not-significantly higher (65.6%) in the silage with Plantanaze® than in the control (64.7%). Non-significantly higher was also the OM digestibility which was estimated on the basis of chemical composition and the amount of gas produced during the in vitro incubation of samples with rumen liquor (63.0% vs. 62.2%). Because of lower mass losses (4.45 vs. 6.97 kg t-1 ensiled forage, P< 0.001) and somewhat higher concentration of NEL (5.01 vs. 4.93 MJ kg-1 DM) the loss of NEL in the silage with the addition of Plantanaze® was lower (3.8 MJ NEL t-1 ensiled forage) than in the silage without silage additive (62.0 MJ NEL t-1 ensiled forage)