Evaluation of Population Management Based on Trap-Neuter-Return and Trap-Neuter-Adoption Practices in a Free-Roaming Cat Colony in the Federal District, Brazil

Abstract

Overpopulation of domestic animals leads to various problems, such as the formation of feline colonies. Population management methods for these colonies have been studied previously; however, no scientific consensus has been reached. This study evaluated the use of trap-neuter-return (TNR) in a free-roaming cat colony in Brazil's Federal District. The study was conducted over 18 months and involved 157 cats that had not previously been managed. The experiment had three parts: recognition and preparation, TNR intervention, and monitoring. The results showed a 47.8% reduction in colony size. Additionally, 98.8% of the animals were sterilized. The adoption, death, disappearance, abandonment, and immigration rates were 19.7%, 14.0%, 14.0%, 7.6%, and 4.5%, respectively. The TNR experiment conducted in the proposed manner, which included detailed pre-planning, mass sterilization, active management, continuous monitoring, and educational actions, proved to be efficient and humane. However, guidelines aimed at managing animal populations, promoting adoption, preventing abandonment, and educating people about responsible pet ownership are essential for achieving sustainable results.

Keywords: cat management; cat overpopulation; free-roaming cats; trap–neuter–return.

Figure 1

Animals in temporary foster homes per trimester.

Figure 2

Deaths per trimester.

Figure 3

Causes of deaths. Those animals whose corpses could not undergo autopsy or which had no reports on the cause of death were categorized as “other”.

Figure 4

Disappearances per trimester.

Figure 5

Abandoned animals per trimester.

Figure 6

Immigrant animals per trimester.

Figure 7

Presence of kittens per trimester.