Question

Vitamin $-B_{12}$ is available to ruminants by :

• A. plants
• B. micro-organisms in caecum
• C. animals
• D. all of the above

Answer 1

Answer: (B)

Vitamin $-B_{12}$ is not found in plants. However it is considered that Spirulina (an algae) contain vitamin $-B_{12}$. Vitamin $-B_{12}$ is synthesized by intestinal bacteria which intact are main source of vitamin $-B_{12}$. Many micro organisms (bacteria of the stomach of ruminant mammals also synthesize large quantities of vitamin $-B_{12}$. Liver and kidney in animals are richest source to vitamin $-B_{12}$.