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Ewes receive hay or graze on fresh pastures supplemented with concentrates to fulfil their lactation requirements. Quebracho ( Schinopsis balansae ) can be added to change the ruminal fermentation. Fermentation parameters of forages alone and 70:30 forage:concentrate diets with control and quebracho concentrate were compared after 24 h of in vitro incubation. Fresh forage diets produced less gas ( p &lt; 0.05) and had greater IVOMD ( p &lt; 0.001), ammonia (NH 3 -N) content, valeric acid, branched-chain volatile fatty acid proportions, and lower propionic acid proportion than the hay diets ( p &lt; 0.01). In the hay diets, methane production increased with control concentrate ( p &lt; 0.01) and tended to decrease with quebacho concentrate ( p &lt; 0.10). The inclusion of both concentrates increased the acetic:propionic ratio ( p &lt; 0.01), and only the inclusion of quebracho concentrate increased the IVOMD ( p &lt; 0.01). In the fresh forage diets, gas and methane production increased with the inclusion of the control concentrate ( p &lt; 0.05), but methane production decreased with quebracho concentrate ( p &lt; 0.01). The inclusion of quebracho concentrate reduced the NH 3 -N content and valeric acid proportion ( p &lt; 0.05). In conclusion, the inclusion of quebracho concentrate would be advisable to reduce the CH 4 production and NH 3 -N content in fresh forage diets and to increase the IVOMD in hay diets in comparison with the forages alone.

The Inclusion of Concentrate with Quebracho Is Advisable in Two Forage-Based Diets of Ewes According to the In Vitro Fermentation Parameters