| Records |
| Author |
Keiper, R.R. |
| Title |
The behaviour, ecology and social organization of the feral ponies of Assateague Island |
Type |
Journal Article |
| Year |
1979 |
Publication |
Proc. I. Conf. Sci. Res. Nat. Parks |
Abbreviated Journal |
Proc. I. Conf. Sci. Res. Nat. Parks, |
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University of Wyoming |
Place of Publication |
Laramie |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
2309 |
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| Author |
Keiper, R.R.; Keenan, M.A. |
| Title |
Nocturnal activity patterns of feral horses |
Type |
Journal Article |
| Year |
1980 |
Publication |
J. Mammal |
Abbreviated Journal |
J. Mammal |
| Volume |
61 |
Issue |
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Pages |
116-118 |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
2311 |
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| Author |
Boyd, L.; Keiper, R. |
| Title |
Behavioural ecology of feral horses |
Type |
Book Chapter |
| Year |
2005 |
Publication |
The domestic horse: the origins, development, and management of its behaviour |
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Cambridge University Press |
Place of Publication |
Cambridge |
Editor |
Mills, D. S.; McDonnell S. M. |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5439 |
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| Author |
Kirkpatrick, J.F.; Liu, I.M.; Turner, J.W.J.; Naugle, R.; Keiper, R. |
| Title |
Long-term effects of porcine zonae pellucidae immunocontraception on ovarian function in feral horses (Equus caballus) |
Type |
Journal Article |
| Year |
1992 |
Publication |
Journal of reproduction and fertility |
Abbreviated Journal |
J Reprod Fertil |
| Volume |
94 |
Issue |
2 |
Pages |
437-444 |
| Keywords |
Animals; Contraception, Immunologic/*veterinary; *Egg Proteins; Estrogens, Conjugated (USP)/urine; Female; Glycoproteins/*pharmacology; Horses/immunology/*physiology; *Membrane Glycoproteins; Ovary/drug effects/*physiology; Progesterone/metabolism; *Receptors, Cell Surface; Swine/immunology; Time Factors; Zona Pellucida/*immunology |
| Abstract |
Ten feral mares free-roaming in Maryland, USA, were inoculated with porcine zonae pellucidae (PZP) protein before the breeding season for three consecutive years (1988-90). Ovarian function was monitored for 51 days during the peak of the breeding season after the third annual PZP inoculation, in seven of these mares and in four untreated control mares, by means of urinary oestrone conjugates and nonspecific progesterone metabolites. None of the ten inoculated mares became pregnant in 1990, compared with 55% of 20 control mares, which included two of the four monitored for ovarian function. Three of the untreated mares demonstrated apparent normal ovarian activity, characterized by preovulatory oestrogen peaks, concurrent progesterone nadirs at ovulation, breeding activity, and luteal-phase progesterone increases after ovulation. Two of the seven monitored PZP-treated mares demonstrated ovulatory cycles that did not result in conception. One was pregnant as a result of conception in 1989 and demonstrated a normal, late-gestation, endocrine profile. The remaining four PZP-treated mares revealed no evidence of ovulation, and urinary oestrogen concentrations were significantly depressed. The experiments indicated that (i) a third consecutive annual PZP booster inoculation is greater than 90% effective in preventing pregnancies in mares and (ii) three consecutive years of PZP treatment may interfere with normal ovarian function as shown by markedly depressed oestrogen secretion. |
| Address |
Deaconess Research Institute, Billings, MT 59102 |
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| Language |
English |
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| ISSN |
0022-4251 |
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| Notes |
PMID:1317449 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
145 |
| Permanent link to this record |
