Variation in ejaculate quality in dark-eyed juncos according to season, stage of reproduction, and testosterone treatment

To assess natural variation in ejaculate quality of male Dark-eyed Juncos (junco hyemalis), as well as to measure any effect of experimental treatm ent with testosterone (T), we used cloacal massage to collect sperm samples from captive (1993) and free-ranging (1994, 1995) populations. We made three...

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Bibliographic Details
Published inThe Auk Vol. 115; no. 3; p. 684
Main Authors Kast, Tracey L, Ketterson, Ellen D, Nolan, Val
Format Journal Article
LanguageEnglish
Published Waco American Ornithological Society 01.07.1998
Subjects
Animal reproduction
Biology
Ornithology
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Summary:To assess natural variation in ejaculate quality of male Dark-eyed Juncos (junco hyemalis), as well as to measure any effect of experimental treatm ent with testosterone (T), we used cloacal massage to collect sperm samples from captive (1993) and free-ranging (1994, 1995) populations. We made three measurements of ejaculate quality in males, approximately half of which had been treated with T: (1) volume, (2) sperm concentration, and (3) total number of sperm per ejaculate (ejaculate size).
ISSN:2732-4613
DOI:10.2307/4089416