Modification of In Vitro Methanogenesis and Rumen Fermentation by using Lauric Acid: A Meta Analysis

Abstract

This study aimed to evaluate the effectiveness of lauric acid, either as pure lauric acid or lauric acid-rich oil, on rumen fermentation and methanogenesis by using a meta-analysis approach from published articles. A total of 89 data points from 24 articles were compiled in a database, consisted of various information, i.e., level of lauric acid, microbial population, rumen fermentation characteristics, total gas production, methane production, and digestibility. The data obtained were analyzed by using the mixed-model methodology. Results showed that the addition of lauric acid reduced methane production (P < 0.001). This decrease was followed by a tendency of methanogen population reduction (P < 0.10) and bacteria (P < 0.10) in the rumen. The addition of lauric acid did not alter total volatile fatty acids (VFA), acetate, propionate and butyrate, but tended to decrease ammonia concentration (P < 0.1). Lauric acid also reduced dry matter digestibility (P < 0.05). It is concluded that lauric acid is an effective agent for mitigating methanogenesis in the rumen.