Good info. Yes, I believe calcium inhibits the action of tetracyclines even more according to what I've read over the years. Vitamin C is a good addition for absorption of tetracyclines. Since that 2 hour window of enrofloxacin administration, it would probably be best to give at night after a...
Something worth noting regarding calcium and enrofloxacin. Apparently birds given calcium less than 2 hours before or after enrofloxacin dosage minimized the effects of antibiotic activity:
http://www.sciencedirect.com/science/article/pii/S0034528806000452