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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.20.0379    [Accepted] Published online August 24, 2020.
Effects of dietary flavonoids on performance, blood constituents, carcass composition and small intestinal morphology of broilers: A meta-analysis
Tri Rachmanto Prihambodo2  , Muhammad Miftakhus Sholikin2  , Novia Qomariyah2  , Anuraga Jayanegara1,*  , Irmanida Batubara3  , Desianto Budi Utomo4  , Nahrowi Nahrowi1 
1Graduate School of Nutrition and Feed Science, Faculty of Animal Science, IPB University, Bogor 16680, Indonesia
2Department of Nutrition and Feed Technology, Faculty of Animal Science, IPB University, Bogor 16680, Indonesia
3Department of Chemistry, Faculty of Mathematics and Natural Sciences, IPB University, Bogor 16680, Indonesia, Bogor, Indonesia
4PT. Charoen Pokphand, Jakarta 14430, Indonesia
5South Sulawesi Assessment Institute of Agriculture Technology, Makassar 90242, Indonesia
6Animal Feed and Nutrition Modelling (AFENUE) Research Group, Faculty of Animal Science, IPB University, Bogor 16680, Indonesia
Correspondence:  Anuraga Jayanegara, Tel: +62-251-8626213, Fax: +62-251-8626213, Email: anuraga.jayanegara@gmail.com
Received: 31 May 2020   • Revised: 26 June 2020   • Accepted: 28 July 2020
Abstract
Objective
This study aims to evaluate the influence of dietary flavonoids on the growth performance, blood and intestinal profiles, and carcass characteristics of broilers by employing a meta-analysis method.
Methods
A database was built from published studies which have reported on the addition of various levels of flavonoids from herbs into broiler diets and then monitored growth performance, blood constituents, carcass proportion and small intestinal morphology. A total of 42 articles were integrated into the database. Several forms of flavonoids in herbs were applied in the form of unextracted and crude extracts. The database compiled was statistically analyzed using mixed model methodology. Different studies were considered as random effects, and the doses of flavonoids were treated as fixed effects. The model statistics used were the p-values and the Akaike information criterion. The significance of an effect was stated when its p-value was <0.05.
Results
Dietary flavonoids increased (quadratic pattern; p<0.05) the average daily gain (ADG) of broilers in the finisher phase. There was a reduction (p<0.01) in the feed conversion ratio (FCR) of the broilers both in the starter (linear pattern) and finisher phases (quadratic pattern). The mortality rate tended to decrease linearly (p<0.1) with the addition of flavonoids, while the carcass parameter was generally not influenced. A reduction (p<0.001) in cholesterol and malondialdehyde (MDA) concentrations (both linearly) was observed, while super oxide dismutase activity increased linearly (p<0.001). Increasing the dose of flavonoids increased (p<0.01) the villus height and villus height and crypt depth (VH:CD) ratio (p<0.05) in the duodenum. Similarly, the VH:CD ratio was elevated (p<0.001) in the jejunum following flavonoid supplementation.
Conclusion
Increasing levels of flavonoids in broilers diet leads to an improvement in growth performance, blood constituents, carcass composition and small intestinal morphology.
Keywords: Broiler; Flavonoid; Growth Performance; Carcass and Blood Composition; Small Intestinal morphology; Meta-analysis


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