Aditivos de accion acidificante (nermosal, foraform, acido formico) en ensilajes de corte directo de pradera permanente.
1991
Dunner W Christian Andres
The purpose of the trial was to evaluate the effect of 3 fermentation inhibitors: Formic acid (F) 3.5 l/ton, Foraform (FF) 2 kg/ton, and Nermosal (N) 2.8 kg/ton. A permanent pasture with 69.5% of perennial ryegrass (L. perenne), was harvested in November (following a 75 days rest) at the state of emergency of ears and ensiled in 8 experimental cylindrical silos (350 kg capacity). The fresh forage had an average of 20% DM; it was compacted at ensiling time and left with a 200 kg/m2 weight on top. As a group, the additives lowered the peak temperature (20.7 deg C) reached by the control, (C, no additive) by 0.6 to 2.5 deg C, treatment F being the most effective. Losses of total DM via effluents monitored for 51 days, and were 7.8, 10.5, 15.8 and 17.2 g of DM/kg of silage DM, for Control and treatments N, FF and F, respectively (P >0.05), this lack of statistical difference is attributed to a large variation among replicates. The average composition ot the effluents was (% of total DM) 24.12, 23.83, 25.73 and 23.82 for CP and 21.61, 23.44, 22.89 and 24.2 for ash, for C, N, FF and F, respectively (P >0.05). In the ensiled material the contents of DM (toluene distillation) were 19.75, 20.0, 18.75 and 24.5 for C, N, FF and F, the latter being higher (P <0.05) than the rest. The crude protein (% DM) was 14.1, 15.2, 15.1 and 14.8, and the contents of EM (mcal/kg DM) was 2.39, 2.49, 2.53 and 2.54, respectively (P >0.05). Final pH was 4.47, 4.53, 4.08 and 4.01, F being lower (P <0.05) than N. The content of N-NH3 (% of total N) was 12.37, 9.25, 10.25 and 8.15 in silages C, N, FF and F, respectively; F being lower (P <0.05) than C. There were no differences either in total production of alcohols (methanol, ethanol, propanol) or of acids (acetic, butyric and lactic); however the ratio lactic/acetic was improved with all the additives.
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