Liqumycin is Oxytetracycline. I have used that on one of my hens with bumblefoot in the past. If I recall correctly, it worked well. It is not the first recommended antibiotic for a staph infection, which is what bumblefoot is, but it is on the list to work with. Staph infections can be knocked out with Oxytetracycline.
Now, once you start with these things, DO NOT stop with it IF it appears to be working! Even if the container says to stop after 10 days, continue on!! That is how bacteria become resistant and the infection gets more aggressive. Believe me, I have stopped with meds for bumblefoot and they become 10 times worse than they were to begin with. I have a hen over here that has MS along with a bumblefoot injury that has been on antibiotics for 3 straight months, on and off for 5 months! It won't kill them. UNLESS your hen starts in with a sour crop, then you will need to continue with these meds for one week PASSED the point that you see no more infection. If you get NO results within 7 days of using this stuff, then it is time to do another route. The best thing you can do is start taking pics of the pad and foot once a week so you can see if there is improvement. Sometimes these things are slow to react and looking at the pad every day and you will think..."darn, nothing is happening!" But it is if you look at feet pics once a week.
If you live in an area with really hard water, it is best to use either RO water or Distilled. Again, Tetracyclines tend to react with salt, magnesium and calcium in water and make the meds half as powerful. My water can be chiseled out of the faucet, LOL, so when ever I use Baytril or Tetracyclines, I have to use pure water.
Every day you will still need to open up the bandages, if there is pus, you will need to drain it, apply some sort of ointment and rebandage. Keep the bandages on until the scab falls off for several months, which ever comes first!! You don't want to get really far with this wound, have it nearly healed and because you didn't bandage it, it went right back to being infected. I have probably used over 20 miles of vet wrap with bumblefeet! LOL...LOL
It will also help the hen to add probiotics to the water or feed everyday for crop health during the med usage and continue with the probiotics for a few weeks after the meds as well.
Keep me posted! And good luck!