The Effect of Delayed Ensiling and Application of an Propionic Acid-Based Additives on the Nutrition Value of Corn Silage

摘要

In order to study the effect of delayed ensiling and application of some organic acid-based additives on fermentation of corn silage, chopped whole plant corn mixed with 4 different additives consist propionic acid in addition to control treatment without any additive. Additives were: 1-Propionic acid 2-Propionic acid (85%) +Formic acid (15%) 3-Calcium propionate 4-Propionic acid (80%) +Formic acid (15%) +Ammonia (5%). 10 g kg~(-1) dry matter of each additives mixed with chopped corn forage in 2 different times (0.48 h). Silages were assessed using method of appearance evaluation and method of DM, pH evaluation CP, NDF, ADF, TWA, WSC, aerobic stability and DM degradation each of treatments were determined after 60 days. Silages that exposed to air 48 h, before ensiling had better appearance quality in Filg's method and whole additives in this experiment had good effect on appearance quality compared with control group. All of silages containing buffered propionic acid-based additive, in the methodDM, pH evaluation, were good and very good. These silages had lower pH than control (p<0.05). Amount of dry matter of control silage which ensiled immediately was lower than other treated silages. NDF in the silages (with Propionic acid (85%) + Formic acid (15%)) was lower than the other silages and content of CP and TVFA increased with addition of the additives especially additive containing Propionic acid (85%) + Formic acid (15%) (p<0.05). WSC in treated silage with additive containing propionic acid(85%) + Formic acid (15%) that wilted 48 h before ensiling was more than other samples (p<0.05). Buffered propionic acid-based additives caused to increase aerobic stability in treated silages compared with untreated silages. Degradation of DM (in situ)in untreated silages that delayed ensiled was lower. Application of the additive containing propionic acid (80%) +Formic acid (15%) +Ammonia (5%) resulted in highest degradation dry matter among experimental additives. Generally, treating with propionicacid-based additives prevented degradation DM decrease (in vitro).