Relationship between Neutral Detergent Fiber and In Vitro Digestibility in Test Crosses of Maize Hybrids

• Tirado-González, Deli Nazmín ^[1] ; Tirado-Estrada, Gustavo ^[1] ; Chávez-Aguilar, Griselda ^[2] ; Aranda-Lara, Ulises ^[3] ; Marroquín-Morales, José Ángel ^[3] ; Gayosso-Barragán, Odilón ^[2]
  1. [1] Tecnológico Nacional de México

     Tecnológico Nacional de México

     México

     
  2. [2] Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuaria
  3. [3] Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias

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• Localización: Agro Productividad, ISSN-e 2594-0252, Vol. 17, Nº. Extra 9, 1, 2024 (Ejemplar dedicado a: Septiembre (Suplemento)), págs. 49-58
• Idioma: inglés
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  • fiber (NDF) and in vitro dry matter disappearance (IVDMD) of test crosses of maize. Design/methodology/approach: Crosses of early, intermediate, and late maize lines (total=75) from high valleys and subtropical/tropical testers were sowed in three regions of Central-North Mexico. Male and female flowering days (MFD, FFD); days to harvest (Dcor); plant and cob length (PL, CL); forage, corn stover (CS), and cobs humid base (HB) and dry matter (DM) yields; and NDF, acid detergent fiber (ADF), hemicellulose (Hem), crude protein (CP), and IVDMD were analyzed. Results: High valleys lines had more MFD, FFD, Dcor, and PL, therefore better forage, MS, and cob yields. More MDF, FFD, and H were related to better HB and DM yields, and CP content, but also were related to more NDF, ADF, and Hem proportions, and therefore to a less IVDMD (r=0.47 to 0.98); however, crosslines with high cob yields also had high CS yields (r=0.57-0.68). Regression linear models showed that one unit of NDF might reduce 0.49 to 56% the IVDMD (R2=0.59-0.78); additionally, NDF<68% was related to IVDMD>60% (R2=0.63-0.78). Limitations on study/implications: ADF correlated negatively with IVDMD in early lines; NDF composition should also be related to its degradability (NDFD). Findings/conclusions: Maize-breeding might be directed to obtain hybrids with less NDF CS contents to use them in ruminant diets, maintaining the cob yields for human nutrition and resistance to plant lodging.