SciELO - Scientific Electronic Library Online

 
vol.43 número2Potencial uso de espectroscopia de reflectancia en el infrarrojo cercano (NIRS) para identificación de charqui de bovino, llama y caballoCambios nutrimentales en el lechón y desarrollo morfofisiológico de su aparato digestivo índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Não possue artigos similaresSimilares em SciELO

Compartilhar


Veterinaria México

versão impressa ISSN 0301-5092

Resumo

NORO, Mirela  e  WITTWER, Fernando. Relationships between liver ureagenesis and gluconeogenesis in ruminants fed with a high nitrogen diet. Vet. Méx [online]. 2012, vol.43, n.2, pp.143-154. ISSN 0301-5092.

Liver ureagenesis and gluconeogénesis are essential metabolic functions in ruminants. These metabolic processes are more intensive in ruminants than other mammals, especially on grazing ruminants or those supplemented with nitrogen because they absorb large amount of the ammonia produced in the rumen and only small amounts of the intestinal glucose. Diets based on the use of forages with a high content of crude protein, rapidly degradable in the rumen, or the supplementation with non-protein nitrogen, increases the ruminal production of ammonia. The excess of ammonia is absorbed and metabolized to urea by the liver. The production of large amounts of ammonia in the rumen and its subsequent absorption can exceed the liver capacity to metabolize urea causing an overcharge in the urea cycle, demanding a large amount of α-ketoglutarate and oxalacetate to produce glutamate and aspartate. Under this condition the gluconeogenic capacity of the organism is altered because these metabolites are also required in the Krebs cycle and gluconeogenesis. The relationships between liver ureagenesis and gluconeogenesis in ruminants fed a high content of nitrogen are reviewed.

Palavras-chave : ureagenesis; gluconeogenesis; non protein nitrogen; ruminants.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons