Adding Condensed Tannins to High-Concentrate Diets: Effects on Rumen Fermentation and Tympanism in Goats

The primary aim of this study was to identify key factors causing high-concentrate diet (HCD)-induced rumen tympanism in goats and to assess the impact of condensed tannin (CT) supplementation (at 1%, 2%, and 3% CT content, w/v) on rumen fluid foam characteristics. Additionally, we explored the feasibility of incorporating CT into HCDs to prevent rumen tympanism. Two trials were conducted to achieve this goal. Trial 1 focused on 15 HCD-fed goats, measuring foaming production, retention, protein fractions, and total protein concentrations. A positive correlation was found between total protein concentration and foaming characteristics (p < 0.05). Protein Component 3 (P3) also correlated with foam (p < 0.05). Five tympanitic goats were further analyzed, with four treatment groups (Control, 1%, 2%, and 3% CT). CT supplementation significantly reduced foaming (p < 0.05). Trial 2 explored CT incorporation into HCDs using 18 goats and three treatment groups (Control, 1% CT, 2% CT). The 2% CT group showed significant foam reduction (p < 0.01). CT did not affect goat health, digestibility, or rumen flora. In conclusion, the addition of 2% CT to HCDs significantly reduces the occurrence of rumen tympanism in goats.