Vitamin B12 Production by Microorganisms Isolated from Poultry House Litter and Droppings

Vitamin B12 uptake by intestinal microorganisms: mechanism and relevance to syndromes of intestinal bacterial overgrowth

“…It does not appear to be related to either a requirement for exogenous B11 or to ability to synthesize B12. All the organisms examined have been shown not to require exogenous B12 (18,(25)(26)(27)(28). This study, as well as that of others (12,18,25), confirms the fact that a wide variety of bacteria, not requiring exogenous B2 for growth, take up as much Bm as quickly and by a similar mechanism, as Bn requiring organisms.…”

The Effects of Vitamin B12 and Thyroprotein on Egg Production, Egg Weight, Shell Quality and Hatchability

“…Support for such a belief is found in the report by Rickes et al (1948b) of the presence of vitamin B12 in the culture broth of several microorganisms, and the findings of Halbrook et al (1950) that yeasts, molds, and many classes of bacteria isolated from poultry house litter and droppings were able to produce appreciable amounts of vitamin B12. The percent hatchability of fertile eggs for ten hatches is given in groups.…”

Physiological and Metabolic Attributes of Microbial Groups Associated with Foods

“…Organisms may also produce nutrients required by other micro-organisms. For instance, the growth of certain exacting lactic acid bacteria is made possible in a food, itself poor in nutrients, through the synthesis of B vitamins by the simultaneous growth of yeasts or moulds, or through the synthesis of vitamin B,, (Halbrook et al, 1950;Burton & Lockhead, 1951 ;Daniels, 1970) or other substances (Branen & Kecnan, 1969) by other bacteria.…”