Wow, this is so helpful. Thank you.
Ev never came back into production after she turned 4; I've never seen that in another hen; they usually taper with age. At roughly the same time, she developed mild rales, decreased energy and a cyanotic comb/wattles. I knew then her future might not be long or great.
Anyway, thinking the labored breathing might be a mycoplasma flare from presumed exposure as a chick, we treated for the respiratory issue last winter/early spring: Clavamox, later doxycycline; neither had any significant effect. Also dexamethasone to address inflammation. Again, no noticeable improvement.
So she just went on -- at about half-speed -- but enjoying her chicken life. Last April, based on advice here, I commenced crop massages and added probiotic powder to their food. I was astounded at her response: Her comb plumped and reddened, breathing and energy markedly improved, though never matched those other peers. I would never have thought about a connection between a slow crop and her chronic respiratory issues.
Of course her comb size and color reduced with winter, but she seemed generally herself until a few weeks ago. I noticed that her top beak had become significantly overgrown -- a puzzle as the flock has been out a lot this mild winter, with opportunities to groom their beaks. (Apparently, beak overgrowth can be related to liver problems.)
Then she started declining morning scratch, and I could feel her crop was not emptying normally. Massages and probiotics did nothing. Vet gave a shot of tetracycline (we had not used that before), but it did not help. On portable ultrasound a couple days after tetracycline injection, vet saw something that looked suspicious, but it was inconclusive. She did not feel any masses on internal exam, but wonders about a body cavity tumor. Ev is walking much less now, and with that wide stance. I tried miconazole for four doses; she continues to slip and I want to quit pestering her.
It's hard to put together all these various things. But I will get the two products you mention and offer them in food; I just can't bring myself to force her. I appreciate all this good information.