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Rumen microbial diversity under influence of a polyclonal antibody preparation against lactate-producing and proteolytic bacteria in cows fed different energy sources

Diversidade microbiana ruminal sob efeito de um preparado de anticorpos policlonais contra bactérias proteolíticas e produtoras de lactato em vacas alimentadas com três diferentes fontes energéticas

Abstracts

Nine ruminally cannulated cows fed different energy sources were used to evaluate an avianderived polyclonal antibody preparation against specific ruminal bacteria and monensin on microbial community diversity. The experimental design was three Latin squares 3 x 3 distinguished by the main energy source in the diet [dry-ground corn grain, high moisture corn silage or citrus pulp]. Inside each Latin square, animals received one of the feed additives per period [control, monensin or polyclonal antibody preparation]. Each period lasted 21 days where 20 were used for treatments adaptation and the last one for sampling collection. Microbial diversity was evaluated by protozoa counts and denaturing gradient gel electrophoresis. Polyclonal antibodies plus citrus pulp (CiPu) addition in the diet resulted in an increase of relative counting of Isotricha protozoa that indicates a possible effect on this ruminal ciliate population. In general lines, in the present experiment, it was not possible to assign that there was a pattern in the structures of amplification of Bacteria and Archaea communities of the ruminal content. Oral passive immunization is a technology that arises as an effective alternative for feed additive production. Further research is still necessary to better understand its mechanisms of action.

denaturing gradient gel by electrophoresis; feed additive; ionophores; passive immunity; protozoa


Nove fêmeas bovinas canuladas no rúmen alimentadas com diferentes fontes energéticas foram utilizadas para avaliar um preparado de anticorpos policlonais aviário contra bactérias ruminais específicas e monensina na diversidade da comunidade microbiana. O design experimental foi três quadrados latinos 3 x 3 distintos pela principal fonte energética na dieta [milho seco e moído, silagem de grão úmido de milho ou polpa cítrica]. Dentro de cada quadrado latino, os animais receberam um dos aditivos alimentares [controle, monensina ou preparado de anticorpos policlonais]. Cada período teve duração de 21 dias onde 20 dias foram utilizados para adaptação aos tratamentos e o último dia para colheita das amostras. A diversidade microbiana foi avaliada pela contagem de protozoários e pela técnica da eletroforese em gel com gradiente desnaturante. Anticorpos policlonais adicionado a polpa cítrica na dieta resultou em um aumento na contagem relativa de Isotricha o que pode indicar um efeito sobre esta população de ciliado ruminal. Em linhas gerais, no presente estudo, não foi possível determinar um padrão nas estruturas de amplificação das comunidades Bacteria e Archaea do conteúdo ruminal. A imunização passiva oral é uma tecnologia que surge como alternativa eficiente para a produção de aditivos alimentares. Novas pesquisas são ainda necessárias para melhor compreender seu mecanismo de ação.

aditivo alimentar; eletroforese em gel com gradiente desnaturante; imunidade passiva; ionóforos; protozoário


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Publication Dates

  • Publication in this collection
    29 Sept 2014
  • Date of issue
    June 2012

History

  • Received
    11 Apr 2011
  • Accepted
    19 Mar 2012
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