Affiliation:
1. Study Program of Nutrition and Feed Science, Graduate School of IPB University, Bogor 16680, Indonesia
2. Animal Feed and Nutrition Modelling Research Group (AFENUE), Faculty of Animal Science, IPB University, Bogor 16680, Indonesia
3. Department of Nutrition and Feed Technology, Faculty of Animal Science, IPB University, Bogor 16680, Indonesia
Abstract
Essential oils (EOs) are secondary metabolites of plants with antimicrobial functions that can be used as silage additives, but their effectiveness has been inconsistent. Therefore, this study aimed to evaluate the effects of EOs as silage additives on nutritional quality, fermentative products, microbial population, and in vitro rumen fermentation. A total of 17 articles consisting of 113 studies (comparisons) were selected for meta-analysis. The results showed that EO supplementation increased several parameters of nutrient contents such as dry matter (DM), crude protein (CP), and ether extract (EE) (p < 0.05), but decreased crude fiber content and mold population (p < 0.05). EO supplementation also affected rumen fermentability, namely reduced gas production, organic matter digestibility, and some fermentation products such as total VFA, iso-butyrate, iso-valerate, acetic, and succinic acid (p < 0.05) but did not affect methane production. Sub-group analysis based on the source of EOs revealed that only cumin and oregano reduced mold population during ensiling (p < 0.05). These results showed that EO supplementation improved several nutrient qualities such as DM, CP, and EE, inhibiting mold growth and stabilizing rumen pH.
Funder
Directorate General of Higher Education, Ministry of Education, Culture, Research, and Technology, Republic of Indonesia
Subject
Plant Science,Biochemistry, Genetics and Molecular Biology (miscellaneous),Food Science
Cited by
6 articles.
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