title: Analysis of the impact of trap-neuter-return programs on populations of feral cats.
abstract: OBJECTIVE
  To evaluate 2 county trap-neuter-return (TNR) programs for feral cat population management via mathematical modeling.
  
  
  METHODS
  Theoretical population model.
  
  
  METHODS
  Feral cats assessed from 1992 to 2003 in San Diego County, California (n = 14,452), and from 1998 to 2004 in Alachua County, Florida (11,822).
  
  
  METHODS
  Data were analyzed with a mathematical Ricker model to describe population dynamics of the feral cats and modifications to the dynamics that occurred as a result of the TNR programs.
  
  
  RESULTS
  In both counties, results of analyses did not indicate a consistent reduction in per capita growth, the population multiplier, or the proportion of female cats that were pregnant.
  
  
  CONCLUSIONS
  Success of feral cat management programs that use TNR can be monitored with an easily collected set of data and statistical analyses facilitated by population modeling techniques. Results may be used to suggest possible future monitoring and modification of TNR programs, which could result in greater success controlling and reducing feral cat populations.
authors.affiliation: Department of Biological Sciences, California State University, Sacramento, CA 95819, USA.
authors.forename: Patrick
authors.initials: P
authors.lastname: Foley
authors.forename: Janet E
authors.initials: JE
authors.lastname: Foley
authors.forename: Julie K
authors.initials: JK
authors.lastname: Levy
authors.forename: Terry
authors.initials: T
authors.lastname: Paik
mesh_terms: D000818:Animals; D000835:Animals, Wild; D002369:Castration / Q000662:veterinary*; D002415:Cats / Q000502:physiology / Q000601:surgery*; D005260:Female; D005298:Fertility / Q000502:physiology*; D008297:Male; D008433:Mathematics; D008954:Models, Biological; D011155:Population Control / Q000379:methods; D011156:Population Density; D011157:Population Dynamics; D015397:Program Evaluation