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RESEARCH ARTICLE

Addition of several tannin extracts to modulate fermentation of barley meal under intensive ruminant feeding conditions simulated in vitro by incubating at pH 6.0–6.2

Z. Amanzougarene A , S. Yuste A and M. Fondevila A B
+ Author Affiliations
- Author Affiliations

A Departamento de Producción Animal y Ciencia de los Alimentos, Instituto Agroalimentario de Aragón (IA2), Universidad de Zaragoza-CITA, Miguel Servet 177, 50013 Zaragoza, Spain.

B Corresponding author. Email: mfonde@unizar.es

Animal Production Science 59(6) 1081-1089 https://doi.org/10.1071/AN17741
Submitted: 26 October 2017  Accepted: 18 May 2018   Published: 5 September 2018

Abstract

The potential use of tannin extracts from quebracho (QCT), grape (GCT), chestnut (CHT) and oak (OHT) included at 10, 20 or 30 mg/g to modulate rumen fermentation of concentrates was studied in three 24-h in vitro incubation runs, with barley grain as reference substrate and simulating high concentrate feeding conditions by adjusting pH at 6.2. Incubation pH at 8 and 24 h ranged from 6.14 to 6.18 and from 5.94 to 6.00, respectively. Gas production from barley alone (CTL) was linearly reduced with CHT (P < 0.05 up to 6 h; P < 0.10 from 8 to 18 h), OHT (P < 0.05 up to 12 h; P < 0.10 from 18 h), GCT (P < 0.05 from 2 to 24 h) and QCT (P < 0.10 up to 6 h), but a quadratic trend (P < 0.10) was also detected on GCT. The effect of GCT was highest and that of CHT lowest. Similarly, dry matter disappearance after 24 h showed a linear decrease with all tannin sources (P < 0.05), being lower with GCT than with QCT and CHT (P < 0.05). All tannin sources linearly increased (P < 0.05) molar butyrate proportion from CTL, at the expense of propionate proportion in GCT (P < 0.01) and CHT (P < 0.10). Except for the linear effect of chestnut on barley fermentation, all sources already reached their maximum level of response at their first level of inclusion (10 mg/g), especially with GCT. Qualitatively, tannins did not largely affect pH or other environmental parameters, except for an increase in butyrate proportion.

Additional keywords: concentrates, condensed tannins, high- concentrate feeding, hydrolysable tannins, in vitro gas production, low pH.


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