Dissertação
Avaliação do uso de extrato tanífero de Acacia mearnsii como modulador da fermentação ruminal em bovinos
Fecha
2012-03-02Registro en:
ALVES, Tiago Pansard. EVALUATION OF THE USE OF Acacia mearnsii TANNIFEROUS EXTRACT AS MODULATOR OF RUMINAL FERMENTATION IN CATTLE. 2012. 54 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Santa Maria, Santa Maria, 2012.
Autor
Alves, Tiago Pansard
Institución
Resumen
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.