How big do their crops feel after 60ml? could you maybe just give 90-120ml twice a day? My smaller ones can't take more than 60ml, but my full sized hens can take 120 quite easily. Any chance you could get a vet to sell you some fluids? If so, I could teach you how to give them subcutaneously and then you wouldn't have to give fluids orally.
-Kathy
-Kathy