SANCHEZ-OLGUIN, Joyce et al. Degradabilidad ruminal y digestibilidad de hojas de caña de azúcar tratadas con ácido fosfórico. []. , 12, 2, e4050.   05--2025. ISSN 2007-901X.  https://doi.org/10.19136/era.a12n2.4050.

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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 H3PO4 0.01, 0.1 y 1.0 molar durante 1, 3, 5 y 7 días. Al día 3 con H3PO4 0.01 y 0.1 molar, FDN y FDA aumentaron y después disminuyó FDN (se disolvió Hem) mientras que FDA, permaneció constante. Al día 3 con H3PO4 1.0 molar, ambas variables disminuyeron (se disolvieron algunas fracciones lignocelulósicas) y FDN continuó disminuyendo. Con H3PO4 0.01, 0.1 y 1.0 molar, LDA aumentó al día 7 (14.78, 14.07 y 11.68%, respectivamente). Con H3PO4 0.01 y 0.1 molar, Hem no cambió con el tiempo, pero Cel disminuyó al día 7 (31.34 y 34.17%). Con H3PO4 1.0 molar del día 1 al 7, Hem y Cel disminuyeron. Con H3PO4 0.01 y 0.1 molar, S aumentó al día 1 (6.72 y 6.92%), y con H3PO4 1.0 molar no cambió. Con H3PO4 0.01 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 H3PO4 se une a la fibra y la aumenta, por lo que FDN, FDA y S aumentan, pero a 1.0 molar (99 g L-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 H3PO4 for 1, 3, 5 and 7 days. At day 3 with H3PO4 0.01 and 0.1 molar, NDF and ADF increased and then NDF decreased (Hem was dissolved) while ADF remained constant. At day 3 with H3PO4 1.0 molar, both variables decreased (some lignocellulosic fractions were dissolved) and NDF continued to decrease. With H3PO4 0.01, 0.1 and 1.0 molar, ADL increased at day 7 (14.78, 14.07 and 11.68%, respectively). With H3PO4 0.01 and 0.1 molar, Hem did not change with time, but Cell decreased at day 7 (31.34 and 34.17%). With H3PO4 1.0 molar from day 1 to 7, Hem and Cell decreased. With H3PO4 0.01 and 0.1 molar, S increased on day 1 (6.72 and 6.92%), and with H3PO4 1.0 molar it did not change. With H3PO4 0.01 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, H3PO4 binds to the fiber and increases it, so NDF, ADF and S increase, but at 1.0 molar (99 g L-1), it dissolves several lignocellulosic fractions of sugarcane leaves increasing their degradability and digestibility.

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