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<p>Ungulates raised in tropical livestock systems can differentially influence soil characteristics through species-specific manure traits, thereby shaping their nutrient footprint and affecting organic matter transformation in tropical soils. Our study examines whether differences in the manure composition of Mediterranean water buffalo (<i>Bubalus bubalis</i>) and Nellore cattle (<i>Bos indicus</i>) are associated with contrasting patterns of nutrient availability and organic matter dynamics under subhumid tropical conditions.&#xa0;Fresh manure samples were collected from each species under comparable conditions of forage composition, management, and topography. We analyzed samples to determine total carbon (C), nitrogen (N), and phosphorus (P) content, microbial biomass carbon (Cmic), potential net carbon mineralization rate (PNCMR), microbial metabolic quotient (qCO₂), fiber fractions (lignin, cellulose, hemicellulose), and molecular composition using ATR-FTIR spectroscopy. Statistical analyses included t-tests, Pearson correlations, and multiple linear regressions.&#xa0;Water buffalo manure exhibited a higher qCO₂ and lower fiber content than cattle manure. In contrast, Nellore cattle manure showed greater lignin content and higher microbial biomass. ATR-FTIR spectra revealed species-specific functional group signatures associated with lignin, proteins, and polysaccharides. PNCMR was positively correlated with hemicellulose in buffalo manure and with microbial biomass in cattle manure, suggesting contrasting microbial decomposition dynamics.&#xa0;Manure composition varies significantly between livestock species and may influence soil nutrient cycling differently. Buffalo manure may enhance the availability of labile nutrients, while cattle manure may promote carbon stabilization. These species-specific nutrient footprints offer opportunities to optimize manure use as organic amendments in tropical livestock systems.</p>

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Microbial Activity and Nutrient Composition of Water Buffalo and Cattle Manure: Implications for Tropical Soils

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • América Isabel Ortiz-Carmona,
  • Yareni Perroni,
  • Ernesto Ruelas Inzunza,
  • Bruno Chávez-Vergara

摘要

Ungulates raised in tropical livestock systems can differentially influence soil characteristics through species-specific manure traits, thereby shaping their nutrient footprint and affecting organic matter transformation in tropical soils. Our study examines whether differences in the manure composition of Mediterranean water buffalo (Bubalus bubalis) and Nellore cattle (Bos indicus) are associated with contrasting patterns of nutrient availability and organic matter dynamics under subhumid tropical conditions. Fresh manure samples were collected from each species under comparable conditions of forage composition, management, and topography. We analyzed samples to determine total carbon (C), nitrogen (N), and phosphorus (P) content, microbial biomass carbon (Cmic), potential net carbon mineralization rate (PNCMR), microbial metabolic quotient (qCO₂), fiber fractions (lignin, cellulose, hemicellulose), and molecular composition using ATR-FTIR spectroscopy. Statistical analyses included t-tests, Pearson correlations, and multiple linear regressions. Water buffalo manure exhibited a higher qCO₂ and lower fiber content than cattle manure. In contrast, Nellore cattle manure showed greater lignin content and higher microbial biomass. ATR-FTIR spectra revealed species-specific functional group signatures associated with lignin, proteins, and polysaccharides. PNCMR was positively correlated with hemicellulose in buffalo manure and with microbial biomass in cattle manure, suggesting contrasting microbial decomposition dynamics. Manure composition varies significantly between livestock species and may influence soil nutrient cycling differently. Buffalo manure may enhance the availability of labile nutrients, while cattle manure may promote carbon stabilization. These species-specific nutrient footprints offer opportunities to optimize manure use as organic amendments in tropical livestock systems.