Data/hora: 01/06/2024 02:31:41

Provedor de dados: | 96
País: | Brazil
Título: | Rumen dynamics of neutral detergent fiber in cattle fed low-quality tropical forage and supplemented with nitrogenous compounds
Autores: | Sampaio,Cláudia Batista; Detmann,Edenio; Lazzarini,Isis; Souza,Marjorrie Augusto de; Paulino,Mário Fonseca; Valadares Filho,Sebastião de Campos.
Data: | 2009-03-01
Ano: | 2009
Palavras-chave: | Rumen degradation; Rumen fill; Signal grass; Supplementation; Urea.
Resumo: | The aim of this work was to evaluate the effects of supplementation with nitrogenous compounds on rumen dynamics of neutral detergent fiber (NDF) in cattle fed low-quality tropical forage. Five crossbred heifers with average live weight of 180 kg and fitted with rumen cannulae were used. The animals were fed ad libitum with signal grass (Brachiaria decumbens Stapf.) hay, which had crude protein (CP) content of 4.86% of dry matter (DM). The five treatments were proposed in order to raise the CP level of diets to 0, 2, 4, 6, and 8 percentile points above the CP level of the forage. The supplement was a mixture of urea, ammonium sulfate, and albumin (4.5:0.5:1.0, respectively). The experiment was carried out according to a 5 × 5 Latin square design, with five experimental periods. The average CP levels in the diets were: 5.19, 7.11, 8.60, 11.67, and 13.02% on DM basis. The potentially degradable NDF was linearly increased according to the CP levels in diet up to 6.97% of CP. From this point, there was stabilization of estimates (47.87% of NDF). The degradation rate of potentially degradable NDF was linearly increased with the CP levels in diets. The rumen flow of fibrous particles (L) showed a linear-response-plateau pattern according to the CP levels in diets. The plateau (maximum estimate) began on 7.24% of CP. The mean retention time in the rumen and the rumen fill effect of undegradable NDF were affect by the CP levels similarly to L, with plateau (minimum) beginning on 6.90 and 6.97% of CP, respectively.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000300023
Editor: | Sociedade Brasileira de Zootecnia
Relação: | 10.1590/S1516-35982009000300023
Formato: | text/html
Fonte: | Revista Brasileira de Zootecnia  v.38 n.3 2009
Fonte: | info:eu-repo/semantics/openAccess