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Author Khalil, A.M.; Murakami, N.; Kaseda, Y.
Title (up) Relationship between plasma testosterone concentrations and age, breeding season and harem size in Misaki feral horses Type Journal Article
Year 1998 Publication The Journal of veterinary medical science / the Japanese Society of Veterinary Science Abbreviated Journal J Vet Med Sci
Volume 60 Issue 5 Pages 643-645
Keywords Age Factors; Animals; Animals, Wild; *Horses; Japan; Male; Reproduction; Seasons; Sexual Behavior, Animal; Sexual Maturation; *Social Behavior; Testosterone/*blood
Abstract Jugular vein blood samples were collected from 23 young and sexual mature feral stallions to examine the relationship between plasma testosterone concentration and age, breeding season or harem size. Testosterone concentration increased with the age of the stallions until they formed their own harems, at about 4 to 6 years old. Seasonal variations in testosterone concentrations were observed, and found to be significantly higher (P<0.001) throughout the breeding season than non-breeding season, from 3 years of age. Testosterone levels were correlated with harem size for individual stallions. It can be inferred from these results that there is a relationship between plasma testosterone concentration and age, breeding season and harem size.
Address Laboratory of Animal Behavioral Science, Faculty of Agriculture, Miyazaki University, Japan
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ISSN 0916-7250 ISBN Medium
Area Expedition Conference
Notes PMID:9637303 Approved no
Call Number refbase @ user @ Serial 137
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Author Kirkpatrick, J.F.; Wiesner, L.; Kenney, R.M.; Ganjam, V.K.; Turner, J.W.
Title (up) Seasonal variation in plasma androgens and testosterone in the North American wild horse Type Journal Article
Year 1977 Publication The Journal of endocrinology Abbreviated Journal J Endocrinol
Volume 72 Issue 2 Pages 237-238
Keywords Androgens/*blood; Animals; Horses/*blood; Male; *Seasons; Testosterone/*blood
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Language English Summary Language Original Title
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ISSN 0022-0795 ISBN Medium
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Notes PMID:845536 Approved no
Call Number refbase @ user @ Serial 148
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Author Chaudhuri, M.; Ginsberg, J.R.
Title (up) Urinary androgen concentrations and social status in two species of free ranging zebra (Equus burchelli and E. grevyi). Type Journal Article
Year 1990 Publication Journal of Reproduction and Fertility Abbreviated Journal J Reprod Fert
Volume 88 Issue Pages 127-133
Keywords zebra; testosterone; androgens; territoriality; social behaviour; dominance
Abstract In both species of zebra, breeding males had higher urinary androgen concentrations (ng androgens/mg Cr) than did non-breeding bachelor males (30.0 +/- 5.0 (N = 9) versus 11.4 +/- 2.8, (N = 7) in the plains zebra; 19.0 +/- 2.2 (N = 17) versus 10.7 +/- 1.2 (N = 14) in the Grevy's zebra). In the more stable family structure of the plains zebra (single male non-territorial groups) variations in androgen concentrations could not be ascribed to any measured variable. In the Grevy's zebra, androgen values were significantly lower in samples taken from territorial (breeding) males which had temporarily abandoned their territories (N = 4) and the urinary androgen concentration for a male on his territory was negatively correlated with the time since females last visited the territory.
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Notes from Professor Hans Klingels Equine Reference List Approved yes
Call Number Serial 987
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