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Pakistan Journal of Biological Sciences
Year: 2008  |  Volume: 11  |  Issue: 24  |  Page No.: 2646 - 2652

The Effect of Delayed Ensiling and Application of Propionic Acid-Based Additives on the Nutritiive Value, Aerobic Stability and Degradability of Corn Silage

S. Arbabi, T. Ghoorchi and S. Hasani    

Abstract: 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 that consists of propionic acid in addition to control treatment without any additive. The additives were: (1) propionic acid (2) propionic acid (85%) + formic acid (15%) (3) calcium propionate and (4) propionic acid (80%) + formic acid (15%) + ammonia (5%). Ten gram per kilogram dry matter of each additives were mixed with chopped corn forage in 2 different times (0, 24 h). Silages were assessed and evaluated for appearance; DM and pH. CP, NDF, ADF, TVFA, WSC, aerobic stability and DM degradation each of treatments were determined after 60 days. Silages that was exposed to air for 24 h, before ensiling had better appearance quality in Filg’s method and whole additives had good effect on appearance quality compared with control group. In the method of DM and pH evaluation, all silages contained buffered propionic acid-based additive, were good and very good. These silages had lower pH than control ones (p<0.05). There was a significant interaction was between silages for concentration of dry matter (p<0.05). NDF in the silages (with propionic acid (85%) + Formic acid (15%)) was lower than the other silages while the contents of CP and TVFA increased (p<0.05) with addition of the additives especially additive containing propionic acid (85%) + formic acid (15%) (p<0.05). WSC in untreated silages was more than the other silage samples (p<0.05). Buffered propionic acid–based additives caused increase in the aerobic stability in treated silages compared with untreated silages. DM degradation (in situ) in untreated silages that delayed ensiled was lower other silages. Application of additives containing propionic acid (80%) + formic acid (15%) + ammonia (5%) resulted in highest DM degradation among experimental additives. Generally, treatment with propionic acid-based additives prevented the decrease of DM degradation (in vitro).

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