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A new approach about the digestion of fibers by ruminants

Uma nova abordagem sobre a digestão de fibras por ruminantes


The decisive role of metallic cations in the formation of supramolecular clusters involving lignin, cellulose, and hemi-cellulose and its relationship to energy losses in ruminants associated with fibrous feed resources is still not well understood. Indeed, interactions between lignin, cellulose and metallic cations generate highly stable clusters that significantly decrease the capability of cellulase to break bonds between sugar units in order to facilitate the absorption of a great quantity of cellulose, which is ingested by ruminants as forage. Furthermore, several metallic cations cannot be absorbed as a consequence of the formation of coordinated ligations with the oxygen atoms of the lignocellulosic cluster. The loss of lignocellulose-metal clusters by ruminants is responsible for a substantial waste of nutrients, which is a significant problem in animal science. Moreover, the chemical structure of these relevant supramolecular systems is poorly understood. In the present review, we discussed this topic in detail in reference to relevant literature from the chemical and animal sciences in order to analyze the perspectives associated with the improvement of nutritional absorption from feed resources by ruminants.

cellulose; clusters; feed resources; lignin; metallic cations; ruminant

O papel decisivo de cátions metálicos na formação de cluster supramoleculares envolvendo lignina, celulose e hemi-celulose and sua relação a perdas energéticas em ruminantes associadas com fontes de alimentação fibrosas não é ainda bem compreendida. De fato, interações entre lignina, celulose e cátions metálicos geram clusters altamente estáveis diminuem significativamente a capacidade da celulase quebrar ligações entre unidades sacarídicas com o objetivo de facilitar a absorção de uma grande quantidade de celulose, a qual é ingerida por ruminantes na forma de forragem. Além disso, diversos cátions metálicos não podem ser absorvidos como uma conseqüência da formação de ligações coordenadas com os átomos de oxigênio do cluster lignocelulósico. A perda de clusters lignocelulósico-metálicos por ruminantes é responsável por um substancial desperdício de nutrientes, o que é um problema significativo em zootecnia. Ademais, a estrutura química destes relevantes sistemas supramoleculares é pobremente compreendida. No presente artigo, nós discutimos esse tópico em detalhes, em concordância com relevante literatura química e zootécnica, objetivando analisar as perspectivas relacionadas com a melhoria com a absorção nutricional a partir de fontes alimentares por ruminantes.

celulose; clusters; fontes nutricionais; lignina; cátions metálicos; ruminante

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Publication Dates

  • Publication in this collection
    16 Aug 2013
  • Date of issue
    June 2013


  • Received
    15 May 2013
  • Accepted
    27 June 2013
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