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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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32 |
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79-87 |
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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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0449-3087 |
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PMID:6962905 |
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refbase @ user @ |
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138 |
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Author |
Shettleworth, S.J.; Krebs, J.R. |
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Title |
How marsh tits find their hoards: the roles of site preference and spatial memory |
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Journal Article |
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Year |
1982 |
Publication |
Journal of experimental psychology. Animal behavior processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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Volume |
8 |
Issue |
4 |
Pages |
354-375 |
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Animals; *Appetitive Behavior; Birds; Cues; Discrimination Learning; *Memory; *Mental Recall; *Orientation; *Space Perception |
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Abstract |
Marsh tits (Parus palustris) store single food items in scattered locations and recover them hours or days later. Some properties of the spatial memory involved were analyzed in two laboratory experiments. In the first, marsh tits were offered 97 sites for storing 12 seeds. They recovered a median of 65% of them 2-3 hr later, making only two errors per seed while doing so. Over trials, they used some sites more often than others, but during recovery they were more likely to visit a site of any preference value if they had stored a seed there that day than if they had not. Recovery performance was much worse if the experimenters moved the seeds between storage and recovery. A fixed search strategy that had some of the same average properties as the tits' search behavior also did worse than the real birds. In Experiment 2, any tendency to visit the same sites on successive daily tests in the aviary was placed in opposition to memory for storage sites by allowing the tits to store more seeds 2 hr after storing a first batch. They tended to avoid individual storage sites holding seeds from the first batch. When the tits searched for all the seeds 2 hr later, they tended to recover more seeds from the second batch than from the first, i.e., there was a recency effect. |
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0097-7403 |
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PMID:7175447 |
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refbase @ user @ |
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385 |
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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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Abbreviated Journal |
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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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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Year |
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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Year |
1982 |
Publication |
Zoologische Garten |
Abbreviated Journal |
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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no |
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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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Journal Article |
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Year |
1982 |
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Abbreviated Journal |
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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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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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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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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1982 |
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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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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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