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Immunocontraception and increased longevity in equids.

Jay F Kirkpatrick1, Allison Turner

  • 1The Science and Conservation Center, Billings, Montana.

Zoo Biology
|April 11, 2009
PubMed
Summary
This summary is machine-generated.

Fertility control in wild horses increases herd longevity. Treated mares lived significantly longer than untreated ones, with longer treatment correlating to greater mean age at death.

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Area of Science:

  • Wildlife Ecology
  • Reproductive Biology
  • Population Management

Background:

  • Intensive management of wild horse populations often involves fertility control.
  • Fertility control can alter herd age structure, typically increasing the proportion of older animals.

Purpose of the Study:

  • To investigate the direct effects of fertility control on wild horse longevity.
  • To compare the mean age at death (MAD) between treated and untreated wild horses.

Main Methods:

  • Calculated MAD for 128 wild horses (56 stallions, 42 untreated mares, 11 mares treated 1-2 years, 19 mares treated >/=3 years).
  • Utilized a porcine zona pellucida contraceptive vaccine for fertility control treatment.
  • Compared MAD across different groups using statistical analysis (P<0.05).

Main Results:

  • Stallions (10.3 years) and mares treated 1-2 years (10.2 years) had significantly greater MAD than untreated mares (6.4 years).
  • Mares treated for >/=3 years exhibited the highest MAD (19.9 years).
  • Contraceptive treatment was associated with increased longevity.

Conclusions:

  • Fertility control, specifically porcine zona pellucida vaccination, significantly increases wild horse longevity.
  • Longer duration of contraceptive treatment is associated with a greater increase in mean age at death.
  • Population management via fertility control impacts individual survival and herd age structure.