Crude extract from yellow yam (Dioscorea cayennensis) in in-vitro Lactobacillus spp. assessment, and as a growth promoter in tambaqui juveniles (Colossoma macropomum)

ABSTRACT

This study aimed to analyze in vitro growth of Lactobacillus spp. with crude extract from yellow yam (Dioscorea cayennensis; CEYY) at different concentrations (0%, 2%, 4%, 6%, and 8%) and the growth performance and metabolic responses of tambaqui juveniles fed with diets containing different CEYY concentrations (0, 20, 40, 60, and 80 g kg^–1). In the in vitro assay, there was no effect on the Lactobacillus spp. growth. The inclusion of 80 g CEYY kg diet^–1 increased growth performance, plasma lysozyme activity and intestinal lactate levels. Hepatic glycogen levels were higher with 60 g CEYY kg diet^–1. The lipase and nonspecific alkaline protease enzymes displayed the highest activity in the control group. There was no influence on the hematologic parameters, plasma glucose and amylase enzyme. In conclusion, the supplementation of 80 g CEYY kg diet^–1 could be indicated for tambaqui, as it improved growth performance, plasma lysozyme and intestinal lactate.

KEYWORDS:

• Growth performance
• intestinal enzymes
• Lactobacillus spp
• lysozyme
• metabolic responses

Acknowledgments

The authors are grateful to CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brazil) for a research grant provided for A. R. L. Souza (process number 88882.431857/2019-01). The authors would like to thank CODEVASF, Petrolina, PB, Brazil (Companhia de Desenvolvimento dos Vales do São Francisco e do Parnaíba) for donating fish.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The data that support the findings of this study are available from the corresponding author ([email protected]), upon reasonable request.

Additional information

Funding

This work was supported by the CAPES [88882.431857/2019-01].