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Jay F. Kirkpatrick Kimberly M. Frank Robin O. Lyda The Science and Conservation Center, Billings MT.

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Presentation on theme: "Jay F. Kirkpatrick Kimberly M. Frank Robin O. Lyda The Science and Conservation Center, Billings MT."— Presentation transcript:

1 Jay F. Kirkpatrick Kimberly M. Frank Robin O. Lyda The Science and Conservation Center, Billings MT

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5 Gather/Removal Fertility Control

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7 Successful Fertilization

8 I Do Not Think So!!

9 FSHLH Estradiol GnRH Neural signal Hypothalamus Ant. Pituitary Estrous Behavior Maternal Behavior Progesterone

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11 Removal Cost/horse Preparation & Holding/horse Adoption /horse Compliance Check/horse Total/horse $800$40$1,100$225$2,165 CONTRACEPTIVE COSTS FOR PRYOR MOUNTAIN HORSESS Application of a one-year PZP vaccine via remote darting/horse = $106 (Bartholow J Economic benefits of fertility control in wild horse populations. J. Wildlife Management 71: )

12 CONTRACEPTIVE EFFICACY ON ASSATEAGUE: MARES FOALS BORN TO: YEAR TREATEDTREATEDUNTREATEDEFFICACY (%)

13 POPULATION GROWTH & FOAL PRODUCTION

14 From Ballou et. Al Wildl. Res. 35:

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16 YearFoalsHorses Removed

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18 Y Y Y Y yuk gag Yummy ugh

19 FSHLH Estradiol GnRH Neural signal Hypothalamus Ant. Pituitary Estrous Behavior Maternal Behavior Progesterone

20 BODY CONDITION SCORES FOR ASSATEAGUE HORSES, 1989 AND 1999 Turner, A, and Kirkpatrick Reproduction (Suppl. 60):

21 MORTALITY AMONG THE ASSATEAGUE HORSES From Turner, A & Kirkpatrick, J.F Reprod. 60:

22 MEAN AGE AT DEATH FOR ASIS HORSES AS A FUNCTION OF LENGTH OF PZP TREATMENT Stallions Untreated Mares Mares Treated < 3yrs Mares Treated > 3yrs Sample (N) Mean Age at Death SEM Kirkpatrick, J. F. and A. Turner Zoo Biology. 26:

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25 Total Horses Gathered Gather-related Mortality “None-gather Related Mortality Percent Source: BLM report

26 Consecutive Years Treated NReversal No/Reversal % ReversedMean Yrs to Reversal 11311/ / Total2414/ Horses RemovedNon-breeding Horses Removed % of Horses Removed That Will Never Breed in the Pryors Reversibility Data For Horses in the 2009 Pryor Gather Removal

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29 GroupNX Exchanges PZP Treated294.4 No Treatment164.3 I am out of here!

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