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Ensign, S. E. (1954). Some effects of the sex hormones on aggressive and reproductive behavior in the terrapene carolina major. Unpublished thesis MS, University of Wyoming, Laramie. 
Added by: Sarina Wunderlich (12 Dec 2010 20:43:03 UTC)
Resource type: Thesis/Dissertation
BibTeX citation key: Ensign1954
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Categories: General
Keywords: Emydidae, Physiologie = physiology, Schildkröten = turtles + tortoises, Terrapene, Terrapene carolina, Verhalten = ethology
Creators: Ensign
Publisher: University of Wyoming (Laramie)
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Abstract     
1. Six groups or Terrapene carolina major were used to study the inrluence or the sex hormones on mating behavior. The animals were placed in cages three months before the experiments started in order that they might become accustomed to cage lire. 3. At the beginning of the experiment a male and a female were placed in the same cage separated from each other by a partition. The partitions were removed during observation periods. 4. During the first group of observations, the animals were not hormonally injected. 5. During the second group, three males received a total of' 7.5 milligrams of' testosterone each, and raur females received a total of 100 international units of estrone each. 6. During the third observation period, three males received a total of 15 milligrams of testosterone each, and rour females received a total of 200 international units of estrone each. 7. During the f'ourth and fif'th observation periods, three males received a total of: 22.5 milligrams of testosterone each, and f'our females received a total of 150 international units of estrone each. 8. F'rom a consideration of the data it appeared tnat after testosterone injection the males: (a) kept their appendages in an extended position more of the time, (b) became more active, (c) displayed more dominance over their female cagemates, (d) overcame obstacles more often in reaching the females, (e) were in proximity to the females more of the time, (f) engaged in sex-oriented behavior more often. 9. After injection of estrone to the females it seemed that they: (a) kept their appendages in a withdrawn position more of the time, (b) became less active, (c) displayed more submission to their male cagemates, (d) were in proximity to the males more of the time, (e) engaged in sex-oriented behavior more often. 10. During the fifth observation period, six non-injected and three testosterone-injected males were used, with four estrone-injected and one non-injected female, to study the influence of testosterone on aggressive male-to-male behavior. 'l'he males which were to be observed for possible aggressive behavior were placed in a cage with a female. An attempt was made .. to use a recept ve female. 11. There was indication that, with only one exception, the testosterone-injected males were dominant to non-injected males. 12. At the conclusion of the experiment, the most dominant male was injected with 150 international units of estrone. bis aggressive behavior apparently decreased.
Added by: Sarina Wunderlich  
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