Here is some info on Denagard posted on the
Chicken Medicine Chart on the website linked in my sig. There is also dose & other info on many medications for various conditions in the chart if you are looking for additional treatment possibilities.
Types:
Denagard 12.5% Liquid
Denagard 10% (2% type may be too dilute to easily treat chickens??) Premix powder
for feed (Do NOT feed undiluted)
Denagard 45% Soluble powder
for drinking water
Notes:
One of the more powerful meds for Mycoplasmas.
*Eggs are safe to eat.
Meat withdrawal: 2-5 days.
*Recommended to give a Tetracycline class med at same time because synergizes & increases effectives of both meds, & also helping prevent E. Coli (which is possible problem after broad antibiotics).
*Don't combine with high doses of the anticoccidials monensin, narasin, or salinomycin.
*Not approved for poultry in US.
*Tastes bad. If giving in drinking water, add sweetener (preferably Xylitol or 100% juice; sugar is another option). If in food, mix in tasty mash. Check to make sure each bird still eats & drinks enough. Can divide dose into food & water to help ensure consumption.*Daily dose must be
given gradually over time--NOT all at once nor in a single meal.
Do NOT give undiluted or bird's system may react with extreme gagging or other symptoms.
Dose for CRD prevention: 1/2 the
"treatment" dose; recommendations about # of days vary.
Reassuring note: Bacteria strains susceptible to Denegard are not able to build resistance very easily, even with underdosing or overly frequent dosing, (though over-use may imbalance bird's body other ways).
Denegard 12.5% Liquid dose:
For CRD treatment: 250 mg per litre drinking water [1/10 tsp (.55 cc) per average chicken]
doses all ages at 25 mg/kg. Treat chicken for 3-5 days, or turkey for 5 days. Birds should show improvement in 1-2 days. Possibly continue treatment once/ month for a year.