EVALUATION OF THE USE OF Acacia mearnsii TANNIFEROUS EXTRACT AS MODULATOR OF RUMINAL FERMENTATION IN CATTLE / AVALIAÇÃO DO USO DE EXTRATO TANÍFERO DE Acacia mearnsii COMO MODULADOR DA FERMENTAÇÃO RUMINAL EM BOVINOS

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

02/03/2012

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.

ASSUNTO(S)

proteína metabolizável retenção de nitrogênio tanino zootecnia tannin nitrogen retention metabolizable protein

ACESSO AO ARTIGO

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