Abstract: This invention discloses novel bacterial spore systems. It has now been found surprisingly that under certain conditions bacterial spore systems can be used in the food and feed industry, preferably in animal feeding and as biohybrid material. More precisely applicant has found the following: Genetically modified or genetically engineered viable spore systems expressing bioactive polypeptides, for example bacteriocins and/or enzymatically active feed enzymes, at the spore surface, have a great potential use in animal feeding. Further, it has been found that genetically modified or “genetically engineered inert spore systems expressing affinity ligands or immobilized enzymes at the surface have a great potential use in biocatalysis and in the construction of biocatalytic films.