Sustainable Animal Husbandry and Reduced Greenhouse Gas Emissions Through Single-Cell Protein

Conventional feed and food production put a huge burden on the climate, and alternative protein sources are sought to feed the growing world population sustainably. This chapter discusses the role that single-cell protein (SCP) can play in animal husbandry. The SCP has emerged as a sustainable alternative to conventional protein sources for animal feed. This chapter reviews the microbial production of SCP through fermentation using molasses, urea, and a consortium of microorganisms such as Saccharomyces cerevisiae, Lactobacillus, Bacillus, and Ruminococcus. Emphasis is placed on the production methods, nutritional benefits, economic feasibility, and the role of SCP in enhancing animal growth and health. The review highlights recent advancements in SCP technology and its practical implications for livestock nutrition. The objective of this chapter is to provide a description of the findings of the investigation. The ability of SCP to boost animal output, minimize reliance on traditional feeds, and adhere to sustainable agriculture methods is of particular value, and it is vital that this capability be taken into consideration. When compared to conventional sources of protein, such as fishmeal and soybean meal, the supply chain for SCP appears to be an alternate choice that is both technoeconomically feasible and beneficial to the environment. The two sources of protein that are being discussed here are both considered to be conventional. The use of by-products from agricultural production as raw material for SCP is a preferred strategy that may be applied in the manufacturing of SCP. SCP today is still a small market; however, there is a possibility that the large-scale implementation of SCP might result in several positive results, such as an increase in animal productivity, a reduction in dependency on conventional feeds, and support for environmentally responsible agricultural methods. SCP has been tested successfully with fish (e.g., in aquaculture), chicken, piglets, mink, and other animals. Moreover, it can be used as food. SCP is obtained from a wide range of unicellular microorganisms: algae, fungi, bacteria, and archaea. The incorporation of sustainable community partnerships of SCP into animal feed systems has the ability to bring about a wide variety of benefits for the animals that are participating in the process. One of these advantages is the decrease in emissions of greenhouse gases, another one is the reduction of dependence on the environment (i.e., arable land), and still another is the improvement of nutrient recycling. SCP’s scalability makes it possible to increase production volumes, which in turn enhances the economic resilience of farmers who are working with restricted resources. In order to properly support the adoption of SCP, it is essential to successfully carry out several technological and policy activities concurrently with the implementation of SCP production capacity. The purpose of these actions is to provide effective support for the acceptance of SCP. Therefore, it is of the utmost importance to make investments in infrastructure, including bioreactors and fermentation facilities. The adoption of SCP into livestock systems provides the agricultural sector with an opportunity to address challenges such as the depletion of resources, the contamination of the environment, and the lack of food security. The propylene glycol energy and probiotic fermented protein are two examples of products that demonstrate how SCP may be applied in a number of applications in the real world.