As promised, further reference material:
ORCAT (Ocean Reef Yacht Club) TNR Program. 1,600 sterilized, 524 adopted, 580 TNRd, 30 not captured (98% capture rate) http://grayvikcenter.com/orcat.htm
"Building the Body of Scientific Evidence that TNR Works," (cited review of published work) http://www.alleycat.org/Document.Doc?id=336
"Evaluation of the Effect of a Long-Term TNR and Adoption Program on a Free Roaming Cat Population," Levy et. al 2003. JAVMA 222(1):42-46. The study also includes discussion of other TNR studies - both successes and failures. But in this study, ultimately 100% sterilization rate was achieved, and "new arrivals were adopted or neutered before they could reproduce."
A review piece: Levy, J.K. and Crawford, P.C., “Humane strategies for controlling feral cat populations.” JAVMA 2004. 225(9): 1354–1360. http://www.avma.org/avmacollections/...225_9_1354.pdf
Natoli et. al 2006. "Management of Feral Domestic Cats in the Urban Environment of Rome (Italy)," Prev Vet Med 2006 Dec 18;77(3-4):180-5. http://www.ncbi.nlm.nih.gov/pubmed/17034887 Findings: The average colony size decreases by 16-32% over 1-3 years of TNR despite immigration (21%) (103 colonies observed over 10 years). Conclusion - TNR must be supported by educational campaigns and low-cost spay/neuter programs.
Basically, despite some serious successes, almost all studies of TNR highlight the importance of supplemental programs, particularly community education, low-cost spay/neuter programs, & adoption programs.
ORCAT (Ocean Reef Yacht Club) TNR Program. 1,600 sterilized, 524 adopted, 580 TNRd, 30 not captured (98% capture rate) http://grayvikcenter.com/orcat.htm
"Building the Body of Scientific Evidence that TNR Works," (cited review of published work) http://www.alleycat.org/Document.Doc?id=336
"Evaluation of the Effect of a Long-Term TNR and Adoption Program on a Free Roaming Cat Population," Levy et. al 2003. JAVMA 222(1):42-46. The study also includes discussion of other TNR studies - both successes and failures. But in this study, ultimately 100% sterilization rate was achieved, and "new arrivals were adopted or neutered before they could reproduce."
A review piece: Levy, J.K. and Crawford, P.C., “Humane strategies for controlling feral cat populations.” JAVMA 2004. 225(9): 1354–1360. http://www.avma.org/avmacollections/...225_9_1354.pdf
Natoli et. al 2006. "Management of Feral Domestic Cats in the Urban Environment of Rome (Italy)," Prev Vet Med 2006 Dec 18;77(3-4):180-5. http://www.ncbi.nlm.nih.gov/pubmed/17034887 Findings: The average colony size decreases by 16-32% over 1-3 years of TNR despite immigration (21%) (103 colonies observed over 10 years). Conclusion - TNR must be supported by educational campaigns and low-cost spay/neuter programs.
Basically, despite some serious successes, almost all studies of TNR highlight the importance of supplemental programs, particularly community education, low-cost spay/neuter programs, & adoption programs.
