There is vitamin B12 and vitamin B complex, the whole group of B vitamins including thiamine, riboflavin, niacin, B12 and others. There is no B 12 complex. It is preferred to give B complex which covers all of the B’s. Riboflavin (B2)
is especially important in chicken leg health.
Yes, the two that passed I took to the state lab for necropsy and it was "probable Marek's" due to the tumors they had inside. Very sad. The roo has shown no other symptoms of it thus far, just the limp. I'm keeping him confined with the B12 complex. He's eating and drinking though not happy about this situation of course. He's a bit hard to handle but I did feel around his legs and feet and while not 100% sure, I didn't feel anything different...I'm really hoping it's a ligament or something strained and that with time and forced rest he'll heal up. Tough to have to play vet using only the internet.
is especially important in chicken leg health.