Xerxes {L_WROTE}:
So my question is - Removing the humane aspect from this problem - what makes TNR more effective than capture and kill - its driving me round the bend trying to work it out so please enlighten me or I will not get any work done today !!
It is actually a simple matter of mathematics. To eliminate the feral dogs by Catch and Kill, it is necessary to catch 100%. As you rightly say, there is an initial visible difference if they kill enough but, if they leave even one breeding couple, the problem will be back to where it was within 2 or 3 years. These dogs have so many excellent hiding places up in the hills that 100% is almost impossible to achieve.The beauty of Trap, Neuter and Return is that only 70% have to be desexed - that is achievable. We amateurs could have achieved this target if we had been allowed to continue our work.
Long term Lamma residents must have observed our work with the feral cats. Ten years ago, the whole island was hotching with cats - many diseased, injured and starving. We achieved 90 - 100% in some areas leading to their rapid elimination but have slowed down the programme in recent years in response to community requests to leave some. The ones that are left are no longer considered a nuisance.
But with dogs it will be necessary to maintain the desexed percentage at 70% until all are gone - there is no place in our modern world for feral dogs.
For further background, please see:
http://programme.rthk.hk/rthk/tv/player ... channel=tv
http://www.youtube.com/watch?v=EyX5Zo2ww00