Edad de corte en la composición química del ensilado de maíz blanco asgrow-7573
Resumen
Para determinar la influencia de la edad al corte en la composición química del ensilado de maíz blanco, se sembraron 36 parcelas (cuatro surcos; 8 m) con el híbrido de maíz blanco Asgrow-7573. En un diseño en bloques completos (DBCA) al azar con cuatro repeticiones, fueron asignadas a nueve fechas de corte: 103, 107, 111, 115, 119, 123, 127, 131 y 135 días a partir de la siembra. La planta se cortó 12 cm del suelo y fue picada a 3 cm; se prepararon mini-silos (5 kg) en bolsa de plástico y se les extrajo el aire. Los silos se abrieron después de 45 días y se les determinó materia seca, cenizas, proteína cruda, FDN, FDA y pH. A los resultados se les aplicó ANDEVA para un DBCA y análisis por polinomios. La materia seca del forraje verde y del ensilado, así como el pH aumentaron de manera lineal (P < 0.00001) a como se incrementó la edad al corte. La proteína cruda fue mayor (P < 0.05) en las primeras fechas. FDN y FDA mostraron un comportamiento cuadrático (P < 0.00001). Se concluye que el corte entre los días 123 y 127 favorece la composición química del ensilado de maíz blanco.
ABSTRACT
To determine the influence of cutting age on the chemical composition of white corn silage, 36 plots were planted (four rows; 8 m) with the white corn hybrid Asgrow-7573. In completely randomized block design, with four replications assigned to nine cutting ages: 103, 107, 111, 115, 119, 123, 127, 131, and 135 days from seeding date. Plants were cut 12 cm over ground, and chopped to 3 cm size; mini-silages (5 kg) were prepared in plastic bags, and the air was extracted. The silages were open after 45 days, and dry matter, ashes, crude protein NDF, ADF and pH were determined. Results were analyzed by ANOVA for a completely randomized block design and polynomial analyses were performed. The dry matter (from fresh forage and silage) as pH (P < 0.00001) when cutting age increased. Crude protein was higher (P < 0.05) during early cutting ages. NDF and ADF showed a quadratic response (P < 0.00001). It is concluded that cutting age from 123 to 127 days improves chemical composition of white corn silage.
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