Joyfull is partly right here.
The datasheets to refer to are available on the NOAH site for both 2.5% & 10%
http://www.noahcompendium.co.uk/Bayer_plc/Baytril_10_ACU-_Oral_Solution/-23507.html
2.5% is for calves and exotics whereas 10% is for poultry (actually meat birds). I'd try for this if possible. There's therefore no recommended withdrawal for eggs. Though it's 8 days for meat.
HF
Below is the information from the NOAH (National Office of Animal Health) website for Baytril 10% oral for your further information,
"Uses
Enrofloxacin is a synthetic, broad spectrum antimicrobial substance, belonging to the fluoroquinolone group of antibiotics. It is bactericidal in action by a concentration - dependant activity against many gram positive and gram negative bacteria as well as mycoplasmas.
It is indicated for use in turkeys, broiler chickens, broiler breeders
and pullets being reared as layers for treatment of diseases of the respiratory and alimentary tracts of bacterial or mycoplasmal origin (e.g. pasteurellosis, mycoplasmosis, coli-bacillosis, coli-septicaemia and salmonellosis), where clinical experience, supported where possible by sensitivity testing of the causal organism, indicates enrofloxacin as the drug of choice. "
I've highlighted the bit about pullets being reared as layers. I take this to indicate that it has not been tested on chickens in lay and particularly their eggs for residues of the antibiotic. I don't suppose there's anything sinister here other than economics. Commercial egg producers don't normally treat their chickens for respiratory disease (or anyother disease which requires a production egg withdrawal). More likely CRD is controlled by vaccination or preventative medication for which there's no withdrawal period. Therefore commercially it's probably of no value to licence this for the treatment of layers. Broilers are more valuable birds however and treatment doesn't cost production.
HF