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Anim Biosci > Accepted Articles
https://doi.org/10.5713/ab.21.0546    [Accepted] Published online June 24, 2022.
Effect of feeding fermented soybean meal on broiler chickens’ performance: A meta-analysis
Agung Irawan1,6,7,*  , Adi Ratriyanto1  , Adib Norma Respati2  , Niati Ningsih3  , Rahma Fitriastuti4  , Wara Pratitis Sabar Suprayogi1, Rendi Fathoni Hadi1  , Wahyu Setyono1  , Novi Akhirini1  , Anuraga Jayanegara5,6 
1Vocational School, Universitas Sebelas Maret, Surakarta 57126 Indonesia
2Department of Animal Science, Faculty of Agriculture, Universitas Sebelas Maret, Surakarta 57126 Indonesia
3Department of Animal Production, Politeknik Negeri Jember, Jember 68124 Indonesia
4Politeknik Pertanian Negeri Pangkajene Kepulauan, South Sulawesi 90761 Indonesia
5Department of Nutrition and Feed Technology, Faculty of Animal Science, IPB University, Bogor 16680, Indonesia
6Animal Feed and Nutrition Modelling Research Group (AFENUE), Department of Nutrition and Feed Technology, Faculty of Animal Science, IPB University, Bogor 16680, Indonesia
7Department of Animal and Rangeland Sciences, Oregon State University, Corvallis 97331, OR, USA
Correspondence:  Agung Irawan,Email: a.irawan@staff.uns.ac.id
Received: 11 December 2021   • Revised: 14 March 2022   • Accepted: 3 May 2022
The present study aimed to quantify the effects of fermented soybean meal (FSBM) on broiler chickens’ performance by employing a meta-analysis approach.
A total of 16 studies were included in the database after being systematically selected using a PRISMA protocol. Hedges’ g effect size was used to quantify pooled standardized mean difference (SMD) using random-effects models at 95% confidence intervals (95% CI). Publication bias among studies was computed with Egger’s test and visualized using funnel plots.
Results indicated that dietary FSBM inclusion increased final body weight (BW) (SMD = 0.586, 95% CI: 0.221 to 0.951, p=0.002) of broiler chickens, particularly in starter period (SMD = 0.691, 95% CL: 0.149 to 1.233, p=0.013) while in the finisher period, the effect was weaker (SMD = 0.509, 95% CI: 0.015 to 1.004, p=0.043). Average daily gain (ADF), feed intake (FI), and feed conversion ratio (FCR) were not affected with FSBM inclusion when compared to control. Subgroup analysis revealed that FI increased in starter period (SMD = 0.582, 95% CI: 0.037 to 1.128, p=0.036). When considering types of microorganism as moderating variables in the subgroup analysis, we found that Aspergillus oryzae, mixed probiotics + bromelain protease, Bacillus subtilis, and Lactobacillus bacteria significantly increased ADG and FI (p<0.01). Additionally, either Bacillus subtilis + protease or Bacillus subtilis alone decreased FCR (p<0.001). However, meta-regression analysis showed that levels of FSBM inclusion had no effects on final BW (p=0.502), ADG (p=0.588), feed intake (p=0.861), and FCR (p=0.462).


Substituting SBM in broiler chickens’ diet with FSBM improved body weight of broiler chickens, especially in the starter period whereas the effects on ADG, FI, and FCR were mostly dependent on microbial strains used for fermentation.
Keywords: Broiler Chickens; Fermentation; Meta-Analysis; Inoculant; Soybean Meal

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