Avaliação do uso de extrato tanífero de Acacia mearnsii como modulador da fermentação ruminal em bovinos
Ano de defesa: | 2012 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
BR Zootecnia UFSM Programa de Pós-Graduação em Zootecnia |
Programa de Pós-Graduação: |
Não Informado pela instituição
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Departamento: |
Não Informado pela instituição
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País: |
Não Informado pela instituição
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Palavras-chave em Português: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/10791 |
Resumo: | The effect of levels of Acacia meanrsii tannin extract addition in cattle diet (0, 0.8, 1.6 or 2.4%, dry matter (DM) basis) on rumen fermentation, digestion and N retention was evaluated. The experiment was conducted in a 4 x 4 Latin Square design with four steers (156 ± 33 kg of body weight (BW)) housed in metabolism cages. Diet was 60% oat (Avena strigosa) and 40% concentrate containing soybean meal as the major protein source. Feed was offered in an amount restricted to 2% of BW as such it was not affected by treatments. Tannin extract inclusion did no effect rumen pH whereas decreased (P≤0,10) ruminal concentration of ammonia N, α-amino N and reducing sugars. The apparent and true OM digestibility were not affected by tannin extract. The ruminal OM digestibility decreased linearly (P≤0,10) and duodenal flow of N α-amino linearly increased (P≤0,10) at increased levels of tannin extract inclusion. Inclusion of 4 or 6% of tannin extract decreased urinary N excretion and improved N retention (P≤0,10). In conclusion, inclusion of up to 2.4% of Acacia tannin extract in cattle diet has the potential to increase the supply of metabolizable protein without adversely affecting the energy supply. |