In vitro gas production and digestibility of mixtures of forages oats-triticale ensiled with fibrolytic enzymes and inoculants

Abstract

Objective: To evaluate the fibrolytic enzymes (FE) and acid-lactic bacterial inoculants (ALB) added to 40 d silages with oats and triticale (O:T) on the proportion and composition of neutral detergent fiber (NDF) and its further in vitro gas production (GP) and digestibility of dry matter (IVDMD). Design/methodology/approach: pH, NDF, acid detergen fiber and lignin (ADF, ADL), hemicellulose (Hem), cellulose (Cel), dry matter (DM), and crude protein (PC), along with the PG (Maximum velocity (Vmax), fractional rate (S), Lag), and IVDMD (24h) of silages O:T (forage proportions (FP): 60:40%, 80:20%) treated with EF (control=0, low dose (LD)=075, medium (MD)=1, and high (HD)=1.25 g/kg of forage in humid base (HB)), and ALB (Control=0, LD=0.188, MD=0.25, and HD=0.31 g/kg HB). Variance analysis (ANOVA) included complete randomized designs (CRD) with factorial and divided parcels arrangements, considering fixed (doses, additives, and FP) and random (place/moment of sampling). Results: ALB improved the IVDMD24 of 60:40 and 80:20 O:T silages. FE did not reduce the NDF of 60:40 silages, but LD and MD increased the Hem and CP, and reduced the ADF, ADL, and Cel, that correlated (r) with the improvement of pH pattern, GP, and IVDMD24. Limitations/implications: The differences in the NDF of mixtures of FP could affect the effectiveness of FE and ALB. Findings/conclusions: Although FE and ALB could not reduce the NDF, they would change the proportions of ADF, ADL, Hem, Cel, and CP of silages, that might improve the GP and IVDMD24.