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Absence of effects from immunocontraception on seasonal birth patterns and foal survival among barrier island wild horses

By J. F. Kirkpatrick, A. Turner

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Abstract

Despite a large body of safety data, concern exists that porcine zonae pellucidae (PZP) immunocontraception - used to manage wild horse populations - may cause out-of-season births with resulting foal mortality. Our study at Assateague, Maryland indicated the effects of immunocontraception on season of birth and foal survival between 1990 and 2002 on wild horses from Assateague Island. Among 91 mares never treated, 69 (75.8%) of foals were born in April, May, and June (in season). Among 77 treated mares, 50 (64.9%) were born in season. Of 29 mares foaling within 1 year after treatment (contraceptive failures), 20 (68.9%) were born in season. Of 48 mares treated for greater than 2 years then withdrawn from treatment, 30 (62.5%) of 48 foals were born in season. There were no significant differences (p

Publication Title Journal of Applied Animal Welfare Science
Volume 6
Issue 4
Pages 301-308
ISBN/ISSN 1088-8705
Publisher Taylor & Francis
DOI 10.1207/s15327604jaws0604_4
Language English
Author Address Science and Conservation Center, Zoo Montana, 2100 South Shiloh Road, Billings, MT 59106, USA.jkirkpatrick@montana.net
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Tags
  1. Animals
  2. Birth
  3. Contraception
  4. Death rate
  5. Developed countries
  6. Foaling
  7. Foals
  8. Horses
  9. Mammals
  10. Maryland
  11. mortality
  12. North America
  13. OECD countries
  14. ovulation
  15. peer-reviewed
  16. photoperiodism
  17. Physiology and biochemistry
  18. Reproduction
  19. seasons
  20. survival
  21. ungulates
  22. United States of America
  23. vertebrates
Badges
  1. peer-reviewed