Effect of starch and nitrogen sources of different ruminal degradability. 1. Total and partial digestibility

Revista Brasileira de Zootecnia

Branco, Antônio Ferriani²  Dalponte, Augusto Ortega¹  Zeoula, Lúcia Maria²  Kassies, Marcos Paulo¹  Prado, Ivanor Nunes do²  Caldas Neto, Saul Ferreira²  Fregadolli, Fábio Luiz² 

[1] Universidade Estadual de Maringá, Maringá

关键词: cassava hulls dried;    corn;    cottonseed meal;    meat and bone meal;    synchronisation;    yeast   IntroduçãoA fermentação ruminal é conseqüência da digestão da matéria orgânica;    regida pela atividade microbiana;    sendo estas funções dependentes do fornecimento de energia e proteína da ração em taxas e quantidades adequadas (STOKES et al;   

DOI  :  10.1590/S1516-35982001000300035

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

-Total and partial digestibility of diets combining the starch sources of high degradability (dried cassava hulls) and low degradability (corn), with nitrogen sources of high (yeast) and low (cottonseed meal and meat and bone meal) degradability, in a 2 x 2 factorial arrangement, were evaluated. Four Holstein steers (334 kg) fitted with ruminal and duodenal cannulas, in a 4 x 4 Latin Square were used. Chromic oxide was used as a marker for drying matter flow. Interactions of starch and N sources on apparent digestibility coefficient (ADC) of crude protein (CP) and neutral detergent fiber (NDF) was detected. Diets of corn and yeast, cassava hulls and cottonseed meal + meat and bone meal showed higher ADC of CP than diets of corn and meat and bone meal and with cassava hulls and yeast. The diet of starch and N with high ruminal degradability showed lower value than others diets, that was not different. Ruminal digestion of NDF was higher when starch source was corn compared with cassava hulls. The highest digestion of starch was higher in diets with cassava hulls than in diets of corn, in all segments of digestive system. Negative values for ruminal digestion of CP to experimental diets were observed. The N source influenced ruminal and intestinal digestion of energy. The ruminal digestion was higher in diets with yeast e intestinal digestion was higher in diets with cottonseed meal + meat and bone meal.

【 授权许可】

CC BY-NC