But here’s a very simple “model”, if you will, that clearly and in simple terms demonstrates the utter worthlessness of TNR and other “no-kill” management schemes:

In the last nearly three decades NO group of TNR practitioners has managed to sterilize more than 0.04% of the stray and feral cat populations in their areas of operation anywhere in the WORLD (Best Friends of Animals Society, n = 100). I challenge you to offer verifiable, quantitative data supporting a greater sterilization rate of any unconfined feral cat population anywhere–by that I mean beginning and ending counts, birth, recruitment, sterilization and attrition rates, disposition, and methodology of removal of all animals separated from the subject colony.

One-third of feral cat populations are reproductive-age females in any given year (Nutter, Stoskopf et al). They produce 4-5 kittens annually, only one of which will itself survive to reproduce; essentially this means the females replace themselves annually, and the overall feral cat population therefore increases by at least one-third annually (ASPCA). So do the math:

You start with 1,000 cats.

Year one, you sterilize 40 of them and the population produces 300 surviving kittens. You therefore have 1,300 unsterilized cats and 40 sterilized cats at the end of the year.

Year two, you sterilize 54 cats (if you’re lucky) and the population produces 439 surviving kittens. You now have 1,739 unsterilized cats and 94 sterilized cats at the end of the year.

Year three, you heroically sterilize 73 cats, and the population produces 574 surviving kittens. You now have 2,353 unsterilized cats and 167 sterilized cats.

What this means is that in the three years in which you managed to sterilize 167 cats, the population increased by 1,353 cats. You will NEVER catch up. Feral cat population reduction by TNR is a MATHEMATICAL IMPOSSIBILITY.

]]>Keep on trappin.’ The wildlife (you know, the REAL wildlife) will benefit.

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