I've looked at other posts, but posting a new thread in hopes that I can get some more/new information. I'll do bullet points to be as brief as possible, but want to give the whole picture: - 29 month old hen, no problems up to now, super strong - 2+ weeks ago, we noticed her crop was not emptying, watery poop with strong ammonia smell - monitored for a week, and it was getting worse. - took her to vet, did blood test - results showed some sort of bacterial infection, along with other issues (SGOT levels high, etc.). Got antibiotics, anti-fungal, and advice to "see if the crop empties". - crop blockage did not improve - we opted for surgery to get it out. Surgery was routine, no issues. - about 6 days later, she showed sudden symptoms of loss of balance (both sides), not able to walk more than a few steps without losing balance. - took her back to vet, did another blood test, etc. - results showed even worse bacterial infection, but uric acid levels, etc. were normal. Basic functional tests (put her on her side/back, she pops up) showed that her brain is not compromised. Got more meds (a different antibiotic, and calcium shots) - **the advice from vet was that "sometimes a severe calcium deficiency can cause balance problems, but if that is the case, you should see vast improvement within a couple hours."** - she showed a little improvement on the first day, but regressed by the next morning. - since last Thursday (10/13/16), we've been giving her the antibiotics and the calcium - she is perking up quite a bit, but no change in balance. I suspect the bacterial infection is getting better. - vet says: "could be Marek's, could be tumors on the spine, could be a blood clot... difficult to tell" (this vet is legit, so I am not being disparaging here.) - Marek's just doesn't seem right (especially in hen of this age) - read some posts here about intensive vitamin B dosing - would love to hear more. What dosage? Similar situation (age)? What else seemed to work? Like all of you, we are absolutely in love with all of our birds - really want to get her through this!! Thank you!!