Berchez, MihaelaUrcan, Adriana CristinaCorcionivoschi, NicolaeCriste, Adriana2020-07-072020-07-072019Berchez, M., Urcan, A. C., Corcionivoschi, N. and Criste, A. (2019) ‘In vitro effects of phenolic acids and IgY immunoglobulins on aspects of rumen fermentation’, Romanian Biotechnological Letters. Digital ProScholar Media, 24(3), pp. 513–521. doi: 10.25083/rbl/24.3/513.521.1224-59842248-3942 (Electronic)https://doi.org/10.25083/rbl/24.3/513.521Publication history: Accepted – 4 January 2019; Published – 2019.The current study was carried out in order to determine the effects of simple phenols and of specific anti-methanogen IgY antibodies on ruminal gas production, methane emissions, volatile fatty acids (VFA) profile and pH in in vitro ruminal cultures. Caffeic and p-Coumaric acids and IgY antibodies were added anaerobically to ruminal batch cultures. Ruminal parameters were measured after 24, 48 and 72 hours of incubation. The results showed that addition ofboth phenolic acids and IgY antibodies significantly (P <0.05) decreased methane production at 24 and 48 hours of incubation. At 24 and 48 hours of incubation some significant differences were observed in volatile fatty acids profile, while the pH was not affected by simple phenols and IgY antibodies addition. Simple phenols and IgY avian antibodies can be further tested in order to achieve the purpose of methane mitigation strategies, but the ideal way to inhibit the methanogenesis process in rumen would reduce methane production without altering the other ruminal parameters, such as VFAs, total gas production or pH.enCopyright © 2019 University of Bucharest. Romanian Biotechnological Letters is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which means that the content published in this journal (articles, conferences, book reviews, etc.) can be downloaded/ used only for non-commercial purposes, specifying the original source and without to be modified in any way. All accepted papers are published open access, according to CC-BY-NC-ND license.mitigationphenolsantibodiesmethanemethanogenesisArticle