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Author |
Turner, J.W.J.; Kirkpatrick, J.F. |
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Title |
Androgens, behaviour and fertility control in feral stallions |
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Journal Article |
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Year |
1982 |
Publication |
Journal of reproduction and fertility. Supplement |
Abbreviated Journal |
J Reprod Fertil Suppl |
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Volume |
32 |
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79-87 |
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Keywords |
Animals; Animals, Wild; Copulation/drug effects; Female; *Fertility/drug effects; Horses/*physiology; Male; Periodicity; Pregnancy; Seasons; *Sexual Behavior, Animal/drug effects; Sexual Maturation; Sperm Count; Sperm Motility/drug effects; Testosterone/*blood/pharmacology |
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Abstract |
This field study of feral stallions in Montana and Idaho examines and correlates the seasonal pattern of plasma androgens and specific sociosexual behaviour and reports the effect of a long-acting androgenic steroid on this behaviour and on fertility. Plasma testosterone was measured by competitive protein binding assay in samples obtained by jugular venepuncture from captured animals. In samples taken from 34 sexually mature stallions in 6 different months during the year, a definite seasonal pattern in testosterone was present, with a peak in May (3.04 +/- 0.63 ng/ml) and a nadir in December (1.55 +/- 0.34 ng/ml). Values were less than 2.0 ng/ml in non-breeding months and greater than 2.4 ng/ml in breeding months. Behavioural endpoints measured were (1) stallion scent marking in response to elimination by mares (elimination marking), (2) mounting and (3) copulation. The frequencies of each of these endpoints followed closely the seasonal pattern seen for plasma androgens. In the fertility study microcapsulated testosterone propionate (microTP) was administered i.m. to 10 harem stud stallions 3 months before the 1980 breeding season. In these stallions and in 10 control harem studs, the above behavioural endpoints were examined in the 1980 and 1981 breeding seasons, and foal counts were made in 1981. There were no direct inhibitory or stimulatory effects of microTP treatment on any of the behavioural endpoints in either year. In 1981 foals were produced in 87.5% of the control bands and 28.4% of the microTP-treated bands. These results indicate that microencapsulated testosterone propionate can provide effective fertility control in feral horses without causing significant alterations in sociosexual behaviour. |
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English |
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0449-3087 |
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PMID:6962905 |
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refbase @ user @ |
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138 |
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Author |
Beaver Bv, |
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Title |
Aggressive bhavior associated with naturally elevated serum Testosterone in mares |
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Journal Article |
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Year |
1982 |
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Appl Anim Ethol |
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8 |
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425-428 |
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from Professor Hans Klingels Equine Reference List |
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Serial |
925 |
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Author |
DENNISTON et al, |
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Title |
Wild horse study |
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Book Whole |
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1982 |
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Bureau of Land Management, |
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from Professor Hans Klingels Equine Reference List |
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1008 |
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Author |
Dolan Jm, |
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Title |
Przewalski's horse, Equus przewalskii Poliakov, 1881, in the United States prior to 1940 and its influence of the present breeding |
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1982 |
Publication |
Zoologische Garten |
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Zool. Garten. |
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52 |
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49-65 |
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from Professor Hans Klingels Equine Reference List |
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1019 |
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Author |
Eisenmann V, |
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Title |
Le cheval: Passé, présent et avenir. |
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Year |
1982 |
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Bull Inf Mus Nat Hist Naturelle |
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30 |
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29-34 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1052 |
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Author |
Eisenmann V, |
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Title |
Les équidés du moyen-orient aus temps préhistoriques. |
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Journal Article |
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Year |
1982 |
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Géochronique |
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4 |
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5 |
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from Professor Hans Klingels Equine Reference List |
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1053 |
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Author |
Eisenmann V, K.A. |
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Title |
Analyses multidemensionelles de métapodes d'Equus sensu lato |
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Journal Article |
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Year |
1982 |
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Bull Mus natn Hist nat |
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4 |
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75-103 |
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from Professor Hans Klingels Equine Reference List |
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1062 |
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Author |
Keiper Rr, B.J. |
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Title |
Refuge – seeking and pest avoidance by feral horses in desert and island environments |
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Journal Article |
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Year |
1982 |
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Abbreviated Journal |
App Anim Ethol |
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9 |
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111-120 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1257 |
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Author |
Ohsawa H, |
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Title |
Transfer of group members in Plain zebras in relation to social organization Afr Study |
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1982 |
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Monogr |
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2 |
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53-71 |
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from Professor Hans Klingels Equine Reference List |
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1431 |
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Author |
Penzhorn Bl, |
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Title |
Age determination in the Cape Mountain Zebras in the mountain zebra natinoal park |
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1982 |
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Koedoe |
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25 |
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89-102 |
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from Professor Hans Klingels Equine Reference List |
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1451 |
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