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The disposal of animal by-products (ABP) has been an operational cost for companies in meat supply chains. The use of biodigestion with the production of an organic pellet and nitrogen-rich liquid effluent, as well as the production of heat in the form of steam, can enable this process to be enhanced. BS Green has elaborated a strategy of total sustainability of meat production chains, extended to horticulture chains as well, with the aim of obtaining products with zero climate-changing gas impact, placing ABP disposal at the center of the system. Organic pellets are used to offset surplus emissions from beef and lamb farms, provided they are used with conservation and regenerative farming techniques that allow permanent storage of carbon in the soil. Nitrogen liquid effluent is used in horticulture for the purpose of reducing its nitrogen footprint. Heat is utilized in sericulture and animal feed to reduce the fossil emissions associated with these two processes. All of this is certified with a registered carbon-neutral NeutryFood® label. This paper illustrates the engineering of the BS Green system for sustainable agriculture and animal husbandry [ABSTRACT FROM AUTHOR]