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Abstract
The purpose of this study is to investigate the effect of dietary supplementation with rhamnolipids (RLs) on the growth performance, slaughter performance, apparent digestibility and fat metabolism of broilers. Broiler chicks were randomly divided into 3 groups: control (C) group, 100 mg/kg (L) and 1,000 mg/kg (H) RL supplementation groups. The results, after dietary supplementation with RLs for 42 days, revealed a RL dose-dependent promoting effect on feed intake, and an increase of the evisceration index of 42-day-old broilers, but a decrease in the rate of abdominal fat gain. The dietary supplementation with RLs significantly increased the digestibility of protein and fat in broilers. The serum total cholesterol and high-density lipoprotein cholesterol levels of the H group were significantly higher than those of the C group (p < 0.01), whereas total triglyceride was lower. The liver triglyceride and total cholesterol levels of the H group were significantly higher than those of the L and C groups (p < 0.05). In summary, dietary supplementation with RLs can improve growth performance and carcase quality of broilers by strengthening the emulsification effect of lipid nutrients in the diet of poultry.
HIGHLIGHTS
Rhamnolipids have a strong oil-water emulsifying capacity and an excellent human safety profile
Dietary supplementation with rhamnolipids can improve growth performance and carcase quality of broilers
Dietary supplementation with rhamnolipids strengthening the emulsification effect of lipid nutrients in the diet of livestock and poultry
Acknowledgements
The authors would like to thank Zhang Chenting and Liu Hongfei for their contribution to this experiment.
Disclosure statement
The authors declare no conflict of interest.
Ethical approval
The authors confirm that the ethical policies of the journal, as noted on the journal’s author guidelines page, have been adhered to and the appropriate ethical review committee approval has been received. The authors confirm that they have followed China’s Animal Welfare Law (Regulations on the Administration of Experimental Animals), and the Ethics Committee of Shanghai Academy of Agricultural Sciences approved the study (authorization number: SAASPZ0520008).
Data availability statement
The data presented in this study are available on request from the corresponding author.