Quantitative analysis of rumen microbial populations by qPCR in heifers fed on Leucaena leucocephala in the Colombian Tropical Dry Forest

Autores

  • Erika Angarita Colombian Corporation of Agricultural Research Corpoica / Center for Research on Sustainable Farming Systems
  • Isabel Molina National University of Colombia / Center for Research on Sustainable Farming Systems
  • Gonzalo Villegas Center for Research on Sustainable Farming Systems
  • Olga Mayorga Colombian Corporation of Agricultural Research Corpoica
  • Julián Chará Center for Research on Sustainable Farming Systems
  • Rolando Barahona Rosales National University of Colombia

DOI:

https://doi.org/10.4025/actascianimsci.v37i2.24836

Palavras-chave:

bacteria, diversity, legume, methanogens, Real Time Polymerase Chain Reaction (RT-PCR).

Resumo

Rumen fermentation and methanogenesis are vital metabolic processes in cattle and are carried out by microbial populations that are affected by dietary factors such as secondary metabolites, nutritional composition and degradability. The aim of this study was to monitor populations of total bacteria, total methanogens and Butirivibrio fibrisolvens in the rumen of Lucerne heifers fed on diets typical of intensive silvopastoral systems (ISS) or of a traditional (control) system. Rumen contents (RC) were collected orally from eight heifers consuming 100% Cynodon plectostachyus (control) and 76% C. plectostachyus + 24% Leucaena leucocephala (ISS) following a crossover design and DNA was extracted and quantified by quantitative PCR. Populations [Log10 (ng g-1 RC)] were 5.6 and 5.8 for total bacteria (p = 0.5343), 3.6 and 3.5 for B. fibrisolvens (p = 0.4742) and 5.0 and 5.3 for total methanogens (p = 0.2661) respectively in control and ISS diets. However, when measured in a separate parallel study, enteric methane emissions (g kg-1 of fermented dry matter) were significantly reduced with the inclusion of L. leucocephala. This fact indicated the importance of investigating the structure, function and interactions of populations beyond quantitative analysis to determine how diet affects rumen microbial populations and their function.

 

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Biografia do Autor

  • Erika Angarita, Colombian Corporation of Agricultural Research Corpoica / Center for Research on Sustainable Farming Systems
    Zootecnista, investigadora y asesora.
  • Isabel Molina, National University of Colombia / Center for Research on Sustainable Farming Systems
    Zootecnista.
  • Gonzalo Villegas, Center for Research on Sustainable Farming Systems
    Zootecnista.
  • Olga Mayorga, Colombian Corporation of Agricultural Research Corpoica
    Investigador Ph.D.
  • Julián Chará, Center for Research on Sustainable Farming Systems
    Investigador Ph.D.
  • Rolando Barahona Rosales, National University of Colombia
    Investigador Ph.D. y profesor

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Publicado

2015-05-21

Edição

Seção

Nutrição de Ruminantes

Como Citar

Angarita, E., Molina, I., Villegas, G., Mayorga, O., Chará, J., & Barahona Rosales, R. (2015). Quantitative analysis of rumen microbial populations by qPCR in heifers fed on Leucaena leucocephala in the Colombian Tropical Dry Forest. Acta Scientiarum. Animal Sciences, 37(2), 135-142. https://doi.org/10.4025/actascianimsci.v37i2.24836