Abstract
Brewer's spent grain (BSG) was used in this study as a support for the immobilization of Lactobacillus paracasei NRRL B-4564, thus enabling the recirculation of immobilized biomass in repeated-batch fermentation. The chemical composition and the energy parameters of the fermented and non-fermented BSG were analyzed and compared. Moreover, the probiotic features of L. paracasei were analyzed to examine the possibility of using fermented BSG as a functional ingredient in ruminant diets. The results obtained indicate that the fermented BSG had significantly higher protein and ash contents, as well as a significantly lower content of fiber fractions. Furthermore, the fermentation process increased the BSG energy content. The analysis of probiotic potential revealed a high tolerance of L. paracasei to pH 2.5 and bovine bile, autoaggregation ability and antimicrobial activity, suggesting that the fermented BSG with immobilized microbial biomass can be used as functional feed in ruminant diets.
Highlights
The global demand for food of animal origin is increasing significantly due to the continued growth of the world population, urbanization, and economy
The analysis of probiotic potential revealed a high tolerance of L. paracasei to pH 2.5 and bovine bile, autoaggregation ability and antimicrobial activity, suggesting that the fermented Brewer’s spent grain (BSG) with immobilized microbial biomass can be used as functional feed in ruminant diets
Using brewer’s spent grain (BSG) as a physical support for Lactobacillus paracasei NRRL B-4564, we examined the effects of lactic acid fermentation and associated biofilms on the quality of BSG as ruminant feed
Summary
The global demand for food of animal origin is increasing significantly due to the continued growth of the world population, urbanization, and economy. In the period 2005-2050, the global demand for meat and milk is expected to increase by 57 % and 48 %, respectively (Mottet et al, 2017). Increased livestock production has become a great challenge, for developing countries, imposing the use of different unconventional feed resources in animal nutrition. Using nutrient resources that are inedible for humans is a possible strategy for both reducing the competitiveness between food and feed and mitigating the environmental impacts of livestock production. The costs of conventional feeds are very high and account for 60-70 % of the production costs in intensive dairy farming (Salami et al, 2019). Supplanting common feed ingredients with some alternative feeds could largely contribute to the sustainability of the livestock industry
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