[mokkol]

Do you have a source of this?

[jlebrech]

http://www.farmhealthonline.com/disease-management/cattle-di...

https://www.riseofthevegan.com/blog/b12-is-not-just-a-vegan-...

here's what they give them:

https://www.alibaba.com/product-detail/supplements-for-anima...

https://www.norbrook.com/products/intravit-12-005wv-solution...