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  • Title: Concentrations of testosterone in canine serum during late anestrus, proestrus, estrus, and early diestrus.
    Author: Olson PN, Bowen RA, Behrendt MD, Olson JD, Nett TM.
    Journal: Am J Vet Res; 1984 Jan; 45(1):145-8. PubMed ID: 6538389.
    Abstract:
    Serum testosterone concentrations in samples collected daily from 6 bitches for at least 60 days before the onset of diestrus were determined by radioimmunoassay. Mean serum concentrations (+/- SEM) of testosterone ranged from 31 +/- 11 to 141 +/- 63 pg/ml during late anestrus. Mean testosterone concentrations during proestrus ranged from 106 +/- 29 to 239 +/- 113 pg/ml, with the highest concentration (526 +/- 225 pg/ml) occurring the day of the preovulatory surge of luteinizing hormone. Although the ovaries may be sites of production during late anestrus, proestrus, estrus, and early diestrus, further investigation is necessary to determine whether testosterone has an important physiologic or endocrinologic function in the bitch (ie, sexual behavior, vaginal hypertrophy, and luteinizing hormone surge).
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