Características agronômicas e valor nutricional das silagens de milheto

Abstract

The experiment was conducted at the Experimental farm of EMBRAPA in the municipality of Janaúba, North of Minas Gerais, in order to evaluate agronomic and nutritional value of the silage of millet genotypes. We used the materials ADR 500; CMS 01; CMS 03; BRS 1501 and SAUNA B. The planting was in a randomized block design on the field, with five replicates per genotype. Agronomic traits were evaluated by counting the number of plants per hectare (NP ha -1 ), plant height, fresh matter production (FMP t ha1 ) and dry matter production (DMP t ha-1 ). After cutting, the material was ensiled in laboratory silos. In the opening of the silos were made analyzes of silage quality (pH, Aw and N-NH3/NT), chemical composition (DM, CP, EE, NDF, ADF, NDIN, NDIA, Hcel, Cel, Lignin, TC, NFC, FC, TDN), in vitro dry matter digestibility (IVDMD) and digestible dry matter production per hectare (DDMP). The values of NP ha-1 were similar between genotypes with average of 167 520 plants ha-1 . The CMS 01 genotype reached the highest plant height with no difference among the others. The FMP t ha-1 was higher and similar for genotypes ADR 500 and CMS 01, with 40.16 and 41.36 t ha-1 , respectively. There was no significant difference for FMP t ha-1 , and the average was 9.93 t ha-1 . The silages were similar with respect to pH, Aw and N-NH3/NT, showing values of 3.92, 0.97 and 7.64 % respectively. No significant differences were found in relation to composition of the silages of different genotypes, being observed average levels of 30.74 % DM, 10.21 % CP, 58.69 % NDF and 38.6 % ADF. There was no significant differences for IVDMD and the average was 59.90 %. Based on the nutritional value and digestibility of millet silage, it is concluded that the five genotypes are suitable for silage with potential for the North of Minas Gerais.