Table 1. Information used in modeling cat population dynamics from 1994 to 2005 if no spay/neuter voucher program had been initiated in Santa Clara County, California.
| Parameter | Owned cats | Unowned cats | References |
|---|---|---|---|
| Kittens/litter | 4.25 | 3.6 | (Pedersen, 1991; Scott, Levy & Crawford, 2002) |
| Kitten mortality rate (%) | 30 | 75 | (Jemmett & Evans, 1977; Nutter, Levine & Stoskopf, 2004; Scott, Geissinger & Peltz, 1978) |
| Life expectancy (years) | 12 | 4.7 | (Levy, Gale & Gale, 2003; New et al., 2004) |
| Litters per female per year | 2.1 | 1.4 | (Pedersen, 1991; Nutter, Levine & Stoskopf, 2004; Levy, Gale & Gale, 2003; Scott, Levy & Crawford, 2002) |
| Percent female | 55 | 45 | (Levy, Gale & Gale, 2003) |
| Sexually intact (%) | 14 | 94.5 | 1993 survey |
| Surrendered to shelter (%) | 3.0 | 7.3 | 1993 survey and shelter statistics |