Características agronômicas de genótipos de sorgo e valores nutricionais das silagens

Abstract

The experiment was carried out at Embrapa - National Research Center for Maize and Sorghum, located at Km 65 of 424 MG, highway Sete Lagoas - MG, aiming to evaluate the agronomic characteristics of sorghum genotypes and nutritional value of their silages. We used 15 sorghum genotypes. The planting was in a randomized blocks design with three replicates per genotype in a total of forty-five (45) plots. Each block contains 15 plots (or 15 treatments). We evaluated the agronomic characteristics: number of plants per hectare (N.Pl.ha1 ), plant height (ALTPL), production of green matter (PMV) and dry matter production (PMS); nutritional characteristics: dry matter (DM), crude protein (CP), ether extract (EE), neutral detergent in nitrogen (NDIN), , acid detergent insoluble insoluble nitrogen (ADIN), neutral detergent insoluble protein (NDIP), acid detergent insoluble protein (ADIP), neutral detergent fiber (NDF) and acid detergent fiber (ADF), the silages quality: pH, NH3/NT and water activity (Aw), and in vitro dry matter digestibility (IVDMD). Data were subjected to analysis of variance using the SISVAR program, and the average were compared to the Scott-Knott test at 5 % probability (P <0.05). There was a difference among genotypes for all traits, except for the contents of ADIN, and ADIP and Aw, for such, the genotypes were similar. When it was assessed the quality parameters, it is observed that all genotypes can be used for silage, with a good fermentation profile. Genotypes 1016009, 1016031 and 1016037 proved superior to the other, with higher yields of DM per area, high CP concentration, low levels of ADF and better IVDDM, contributing to better utilization of these materials by animals.