The Alliance for Contraception in Cats & Dogs recently published the results of a study where they compared various methods of controlling the free-roaming cat population. Using simulation model, they looked at the impact of different management approaches on free-roaming kitten and cat mortality over a 10-year period. 

The 7 management approaches were:
1. Take no action
2. Low-intensity removal
3. High-intensity removal
4. Low-intensity episodic culling
5. High-intensity episodic culling
6. Low-intensity trap-neuter-return (TNR)
7. High-intensity TNR

The researchers concluded “For all management scenarios, the model predicts that the higher-intensity option (defined in terms of the proportion of animals sterilized or removed within a given time period) would result in fewer preventable deaths over time than the lower-intensity option.” They went on to state “With sufficient intensity, management by TNR offers significant advantages in terms of combined lifesaving and population size reduction.” 

Read the entire report: “A Long-Term Lens: Cumulative Impacts of Free-Roaming Cat Management Strategy and Intensity on Preventable Cat Mortalities