Chemical characteristics and digestibility of forage maize hybrids associated with foliar fungicide application ; Características bromatológicas e digestibilidade de híbridos de milho forrageiro associados à aplicação de fungicida foliar

The objective of this study was to evaluate the effect of foliar fungicide application on the chemical characteristics and in situ digestibility of forage and silage in forage maize hybrids with different grain textures in two sowing seasons. A randomized complete block design was used with four replications, in a 4 x 2 factorial arrangement, 4 hybrids, with and without foliar fungicide application, in two sowing seasons. The hybrids used were DKB240PRO, AS1572PRO, 32R48YH and AG8690PRO3. Data were tested by analysis of variance; the means were compared by Tukey’s test at 5% probability and two non-orthogonal contrasts were performed. The application of fungicide on forage maize hybrids reduced the content of neutral detergent fiber (NDF), acid detergent fiber (ADF), soft dough stage and in the silage produced. The sowing season in December negatively influenced the chemical parameters of forage maize hybrids, compared to sowing in October. Hybrids with highly vitreous endosperm presented the highest contents of NDF and ADF, soft dough stage and in the silage produced. The application of fungicide (trifloxystrobin + prothioconazole) at the V8 and R1 stages positively influenced in situ digestibility soft dough stage and in the silage produced, depending of the sowing season. ; O objetivo foi avaliar o efeito da aplicação foliar de fungicida sobre as características bromatológicas e digestibilidade in situ de forragem e silagem em híbridos de milho forrageiro com diferentes texturas de grãos em duas épocas de semeadura. O delineamento foi blocos casualizados, em esquema fatorial 4x2, 4 híbridos, sem e com aplicação de fungicida, em duas épocas de semeadura. Os híbridos utilizados foram DKB240PRO, AS1572PRO, 32R48YH e AG8690PRO3. Os dados obtidos foram submetidos à análise de variância, as médias comparadas pelo teste de Tukey e realizados dois contrastes não ortogonais. A aplicação de fungicida em híbridos de milho forrageiros reduziu os teores de fibra em detergente neutro (FDN) e fibra em detergente ácido (FDA) ...