Abstract: Provided is a method for large-scale production of magnetosomes, the method comprising maintaining in a fermentation vessel under continuous fermentation conditions a fermentation broth comprising magnetotactic bacteria for a duration of at least 100 hours and during said maintaining, providing to said fermentation broth at least one feed composition comprising iron ions and molecules and/or ions of at least 4 selected from the group consisting of lactic acid, ammonia, magnesium, potassium, thiamine, calcium and combinations thereof at an average feed rate of between 10% and 150% of the volume of the fermentation vessel per day; adding oxygen to said fermentation broth in said fermentation vessel; and removing a portion of said fermentation broth comprising said magnetotactic bacteria at an average rate of between 10% and 150% of the fermentation vessel volume per day.

Abstract: Provided is a magnetosome comprising a doped mineral. Further provided is method for large-scale production of magnetosomes comprising a doped mineral, the method comprising maintaining in a fermentation vessel under continuous fermentation conditions a fermentation broth comprising magnetotactic bacteria for a duration of at least 100 hours and during said maintaining, providing to said fermentation broth at least one feed composition comprising iron ions, at least one dopant, and molecules and/or ions of at least 4 selected from the group consisting of lactic acid, ammonia, magnesium, potassium, thiamine, calcium and combinations thereof at an average feed rate of between 10% and 150% of the volume of the fermentation vessel per day; adding oxygen to said fermentation broth in said fermentation vessel; and removing a portion of said fermentation broth comprising said magnetotactic bacteria at an average rate of between 10% and 150% of the fermentation vessel volume per day.

Abstract: Provided is a method for the production of single cell protein (SCP) comprising anaerobic fermentation of Clostridia bacterium on a fermentation medium comprising a gas, wherein said gas provides a source of energy and carbon for said bacterium. Further provided is a single cell protein produced by the method as disclosed herein.

Abstract: Provided is a feed ingredient comprising propionate and a byproduct of fermentation of a feedstock by propionic acid-producing bacteria, wherein said feedstock comprises a carbon source and wherein said bacteria are of a class selected from the group consisting of Actinobacteria, Bacteroidia, Clostridia, Negativicutes and combinations thereof. Also provided are methods for manufacturing the feed ingredient and uses thereof.

Abstract: Provided are compositions comprising at least one organism of a strain of the order Clostridiales and methods of use thereof for protecting against an infection, such as a viral, protozoal or fungal infection in an animal. Also provided are methods for improving hatchability of an egg under contaminated conditions by protecting against infection of an avian in ovo.

Abstract: Provided is a composition comprising at least one selected fragment of DNA exogenous to a targeted organism and a carrier, wherein said DNA fragment has at least 50% sequence homology to a DNA sequence of said targeted organism and wherein said fragment comprises no more than 5 unprotected specific endonuclease recognition sites of said targeted organism. Further provided are methods of use of the composition. Further provided are methods for producing the composition.

Abstract: Provided are methods and compositions an organism of the order Clostridiales for improving the health of an avian, wherein an effective dose of the composition is applied to an outer surface of an egg containing the avian as an embryo prior to hatching. Also disclosed are compositions comprising a strain within the order Clostridiales selected from the group consisting of Caldicoprobacteraceae; Christensenellaceae; Clostridiaceae; Defluviitaleaceae; Eubacteriaceae; Graciibacteraceae; Heliobacteriaceae; Lachnospiraceae; Oscillospiraceae; Peptococcaceae; Peptostreptococcaceae; Ruminococcaceae; Syntrophomonadaceae and combinations thereof and their use in such methods.

Abstract: Provided is a feed ingredient comprising at least 20% by weight Clostridium tyrobutyricum, wherein said Clostridium tyrobutyricum comprises at least 70% of dry weight crude protein and optionally at least 7% of dry weight lysine and/or at least 1% of dry weight methionine. Further provided are animal feeds and probiotic compositions comprising the feed ingredient, methods for the production thereof and uses thereof.

Abstract: Methods and compositions utilizing organism consisting of the strains within the order Clostridiales for improving health of animals. Disclosed methods comprise administering an effective dose of a composition comprising organism consisting of the strains within the order Clostridiales to an animal, including for example, a broiler or hen, thereby improving said animal's health.