Acceso usuarios
Joyce Sánchez-Olguín
, José I. Alejos de la Fuente, Glafiro Torres Hernández, Eliseo Sosa Montes, Arturo Pro Martínez, Benito Bello Olivera
Se trataron hojas de caña de azúcar con ácido fosfórico (H3PO4), y se determinaron, fibra detergente neutro (FDN), fibra detergente ácido (FDA), lignina (LDA), hemicelulosa (Hem), celulosa (Cel), sílice (S), degradabilidad ruminal (Deg) y digestibilidad ruminal (Dig). Se impregnaron 500 g de hojas con 250 mL de H3PO40.01, 0.1 y 1.0 molar durante 1, 3, 5 y 7 días. Al día 3 con H3PO40.01 y 0.1 molar, FDN y FDA aumentaron y después disminuyó FDN (se disolvió Hem) mientras que FDA, permaneció constante. Al día 3 con H3PO41.0 molar, ambas variables disminuyeron (se disolvieron algunas fracciones lignocelulósicas) y FDN continuó disminuyendo. Con H3PO40.01, 0.1 y 1.0 molar, LDA aumentó al día 7 (14.78, 14.07 y 11.68%,respectivamente). Con H3PO40.01 y 0.1 molar, Hem no cambió con el tiempo, pero Cel disminuyó al día 7 (31.34 y 34.17%). Con H3PO41.0 molar del día 1 al 7, Hem y Cel disminuyeron. Con H3PO40.01 y 0.1 molar, S aumentó al día 1 (6.72 y 6.92%), y con H3PO41.0 molar no cambió. Con H3PO40.01 y 0.1 molar, Deg y Dig no cambiaron, mientras que, con 1.0 molar el día 1, ambas variables aumentaron. Conclusión: a bajas concentraciones, el H3PO4se une a la fibra y la aumenta, por lo que FDN, FDA y S aumentan, pero a 1.0 molar (99 gL-1), disuelve varias fracciones lignocelulósicas de las hojas de caña de azúcar aumentando su degradabilidad y digestibilidad.
Sugarcane leaves were treated with phosphoric acid (H3PO4) and neutral detergent fiber (NDF), acid detergent fiber (ADF), lignin (ADL), hemicellulose (Hem), cellulose (Cell), silica (S), ruminal degradability (Deg) and ruminal digestibility (Dig) were determined in sugarcane leaves. Five hundred g of leaves were impregnated with 250 mL of 0.01, 0.1 and 1.0 molar H3PO4for 1, 3, 5 and 7 days. At day 3 with H3PO40.01 and 0.1 molar, NDF and ADF increased and then NDF decreased (Hem was dissolved) while ADF remained constant. At day 3 with H3PO41.0 molar, both variables decreased (some lignocellulosic fractions were dissolved) and NDF continued to decrease. With H3PO40.01, 0.1 and 1.0 molar, ADL increased at day 7 (14.78, 14.07 and 11.68%, respectively). With H3PO40.01 and 0.1 molar, Hem did not change with time, but Cell decreased at day 7 (31.34 and 34.17%). With H3PO41.0 molar from day 1 to 7, Hem and Cell decreased. With H3PO40.01 and 0.1 molar, S increased on day 1 (6.72 and 6.92%), and with H3PO41.0 molar it did not change. With H3PO40.01 and 0.1 molar, Deg and Dig did not change, while, with 1.0 molar on day 1, both variables increased. Conclusion: at low concentrations, H3PO4binds to the fiber and increases it, so NDF, ADF and S increase, but at 1.0 molar (99 gL-1), it dissolves several lignocellulosic fractions of sugarcane leaves increasing their degradability and digestibility.
