Combinations of starch and nitrogen sources in high and low ruminal degradability evaluated by in situ technique

• Autor(a) principal: Zeoula, Lúcia Maria
• Data de Publicação: 2008
• Outros Autores: Michelan, Andrea Cristiane, Fregadolli, Fábio Luiz, Damasceno, Júlio Cesar, Prado, Ivanor Nunes do, Fridrich, Daniele, Morais, Reinaldo Gomes de
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Acta Scientiarum. Animal Sciences (Online)
• Texto Completo: https://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/4368
• topic: amido; concentrados; degradabilidade ruminal; matéria seca; nitrogênio; 5.04.00.00-2 Zootecnia

The objective of this paper was to evaluate the ruminal degradability of four isonitrogenized and isoenergetic concentrates which differed as for starch and nitrogen sources. Three holstein cows with 530kg average weight and fistulated rumen were used in this investigation. The concentrates formulated with starch and nitrogen sources of high ruminal degradability presented higher values of drymatter, crude protein and starch effective degradability (ED) for 2%/h, 5%/h and 8%/h passage rates, but the reverse was also observed for concentrates with starch and nitrogen sources of low ruminal degradability. The concentrates formulated by alternating starch and nitrogen sources of high and low ruminal degradability showed dry matter and protein ED intermediate values. The starch ED was influenced by the starch source independently of the nitrogen source.