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Impact of a tannin extract on digestibility, ruminal fermentation and duodenal flow of amino acids in steers fed maize silage and concentrate containing soybean meal or canola meal as protein source

Published online by Cambridge University Press:  24 March 2015

S. C. ÁVILA ,
G. V. KOZLOSKI ,
T. ORLANDI ,
M. P. MEZZOMO  and
S. STEFANELLO
S. C. ÁVILA
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Santa Maria, RS 97105-900, Brazil
G. V. KOZLOSKI*
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Santa Maria, RS 97105-900, Brazil
T. ORLANDI
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Santa Maria, RS 97105-900, Brazil
M. P. MEZZOMO
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Santa Maria, RS 97105-900, Brazil
S. STEFANELLO
Affiliation:
Departamento de Zootecnia (Animal Science Department), Universidade Federal de Santa Maria, Santa Maria, RS 97105-900, Brazil
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

Four Holstein steers (297 ± 56 kg of body weight (BW)) fitted with duodenal cannula and rumen catheter, were housed in metabolism cages and used in a 4 × 4 Latin Square trial to evaluate the effect of both protein source and Acacia mearnsii tannin extract on digestibility, ruminal fermentation, rumen microbial protein synthesis, N utilization and on duodenal flow of individual amino acids. The diet was offered at restricted amount of 25 g of dry matter (DM)/kg BW and consisted of maize silage plus concentrate, in a proportion of 0·7:0·3 (DM basis) respectively. Concentrate was formulated with either soybean meal or canola meal as protein source, with or without 50 g/kg of A. mearnsii tannin extract (i.e. 15 g/kg of total dietary DM). There was no effect of protein source on most variables. The apparent and true organic matter (OM) digestibilities, as well as neutral detergent fibre (NDF) digestibility were negatively affected by tannin extract inclusion without, however, affecting digestible OM intake. The amount of nitrogen (N) excreted in faeces increased whereas the urinary N excretion decreased in tannin extract treatments. No interaction time × treatment was detected for any rumen variable and no treatment effect was observed for rumen fluid pH and reducing sugars concentration. Rumen fluid concentration of ammonia N was lower for the canola meal plus tannin extract treatment. Rumen concentration of α-amino compounds was not affected by tannin extract but was higher when canola meal was the protein source. The duodenal flow of OM, total N, α-amino N and non-ammonia non-microbial N increased with tannin extract inclusion, whereas the duodenal flow of microbial N was not affected by treatment. For both protein sources, the amount of most individual amino acids flowing to the duodenum increased due to tannin extract addition. In conclusion, the dietary inclusion of 15 g/kg DM of tannin extract from A. mearnsii improved the amino acid supply independently of whether the protein source was canola meal or soybean meal, without affecting the amino acid profile, to steers fed maize silage plus concentrate, with a minor but significant impact on OM digestibility.

Type
Animal Research Papers
Information
The Journal of Agricultural Science , Volume 153 , Issue 5 , July 2015 , pp. 943 - 953
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Copyright
Copyright © Cambridge University Press 2015 

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