| Peter: Must confess that the only animal tracking applications with which I've been involved have been in the beef processing as opposed to the live animal environment. That said, you may know that the technology has been used for farm animal tracking for many years. The low frequency (125-135 kHz) RFID technology used in injectable tags is generally applied in short range or proximity applications. LF systems have a limited reading range due to inadequate signal-to-noise ratios. Further, they generally have limited, if any, anti-collision capability, are too slow for multi-read applications and are more susceptible to electromagnetic inference than higher frequency tags. On the other hand, I am certain that other users may be experiencing similar problems and may already be pressuring suppliers for solutions. You may want to contact the World Small Animal Veterinary Association and the American Veterinary Medical Association to see if they are addressing the issues. Failing that, I would suggest that the best answers to your questions might come from those companies who are serving the animal market segment; namely AVID Microchip ID Systems, American Veterinary Devices, Biomark, Digital Angel Corp., and Texas Instruments. Good luck. Let me know what you learn and I'll get it in the website. John |