Nutritional Evaluation of Tropical Forage Grass Alone and Grass-Legume Diets to Reduce in vitro Methane Production

Authors Organisations
  • Stiven Quintero-Anzueta(Author)
    University of Santiago de Cali
    International Center for Tropical Agriculture
  • Isabel Cristina Molina-Botero(Author)
    International Center for Tropical Agriculture
    Universidad Nacional Agraria La Molina
  • Juan Sebastian Ramirez-Navas(Author)
    University of Santiago de Cali
    Universidad del Valle
  • Idupulapati Rao(Author)
    International Center for Tropical Agriculture (CIAT) , Palmira , Colombia
  • Ngonidzashe Chirinda(Author)
    International Center for Tropical Agriculture
    Mohammed VI Polytechnic University
  • Rolando Barahona-Rosales(Author)
    Department of Animal Production, Faculty of Agricultural Sciences, Universidad Nacional de Colombia , Medellin , Colombia
  • Jon Moorby(Author)
  • Jacobo Arango(Author)
    International Center for Tropical Agriculture (CIAT) , Palmira , Colombia
Type Article
Original languageEnglish
Article number663003
Number of pages13
JournalFrontiers in Sustainable Food Systems
Volume5
DOI
Publication statusPublished - 14 Jun 2021
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Abstract

Forage grass nutritional quality directly affects animal feed intake, productivity, and enteric methane (CH4) emissions. This study evaluated the nutritional quality, in vitro enteric CH4 emission potential, and optimization of diets based on two widely grown tropical forage grasses either alone or mixed with legumes. The grasses Urochloa hybrid cv. Cayman (UHC) and U. brizantha cv. Toledo (UBT), which typically have low concentrations of crude protein (CP), were incubated in vitro either alone or mixed with the legumes Canavalia brasiliensis (CB) and Leucaena diversifolia (LD), which have higher CP concentrations. Substitution of 30% of the grass dry matter (DM) with CB or LD did not affect gas production or DM degradability. After 96 h of incubation, accumulated CH4 was 87.3 mg CH4 g−1 DM and 107.7 mg CH4 g−1 DM for the grasses alone (UHC and UBT, respectively), and 100.7 mg CH4 g−1 DM and 113.2 mg CH4 g−1 DM for combined diets (70% grass, 15% CB, and 15% LD). Diets that combined legumes (CB or LC) and grass (UHC or UBT) had higher CP contents, gross, and metabolizable energy (GE, ME, respectively) densities, as well as lower concentrations of neutral detergent fiber (NDF) and acid detergent lignin (ADL). The ME and nutritional variables such as NFD, tannins (T), and CP showed a positive correlation with in vitro net gas production, while ruminal digestibility was affected by CP, ADL, T, and GE. Optimal ratios of components for ruminant diets to reduce rumen net gas production and increase protein content were found with mixtures consisting of 60% grass (either UHC or UBT), 30% CB, and 10% LD. However, this ratio did not result in a decrease in CH4 production.

Keywords

  • Sustainable Food Systems, Canavalia brasiliensis, in-vitro fermentation, Leucaena sp., nutritional quality, Urochloa brizantha cv. Toledo, Urochloa hybrid cv. Cayman

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