{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T23:50:56Z","timestamp":1791244256540,"version":"4.1.0"},"reference-count":49,"publisher":"Zoological Society of Japan","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Zoological Science"],"published-print":{"date-parts":[[2025,9,3]]},"abstract":"<jats:p>Photoperiod and melatonin regulate reproduction in mammals. The rice rat (Oryzomys palustris) is reproductively photoperiodic and on a long photoperiod responds to melatonin administration with inhibited reproduction. I examined whether photoperiod, melatonin, and the removal of gonadal steroids via castration affected growth, reproduction, pelage, and swimming ability. Juvenile males were housed on 14L:10D or 11L:13D and at 68 days of age rice rats were weighed, allowed to swim for 10 minutes while being videotaped to quantify swimming and floating times, and then reweighed. One day later, these rice rats were euthanized and the testes, seminal vesicles (SV), Harderian glands (HG), and spleen were weighed. The shorter photoperiod significantly decreased body, testes, SV, and HG masses only. The pelage of rice rats absorbed more water on 14L:10D than on 11L:13D, despite no difference in pelage lengths. Melatonin implants decreased body mass, the masses of the testes, SV, and HG, and pelage water absorption, but increased pelage length. Lastly, castration decreased SV and HG masses, but increased body and spleen masses. Swimming and floating times were not affected by any treatment. Taken together, these results show that all treatments affected growth and reproduction in rice rats, but did not affect swimming ability. Thus, the physiological changes characteristic of winter are not sufficient to alter aspects of swimming ability as swimming ability appears to be independent of reproductive condition.<\/jats:p>","DOI":"10.2108\/zs240114","type":"journal-article","created":{"date-parts":[[2025,9,3]],"date-time":"2025-09-03T02:26:27Z","timestamp":1756866387000},"page":"471-477","source":"Crossref","is-referenced-by-count":0,"title":["Regulation of Reproduction and Swimming Ability in the Male Marsh Rice Rat (Oryzomys palustris)"],"prefix":"10.2108","volume":"42","author":[{"given":"Kent","family":"Edmonds","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"848","reference":[{"key":"1","doi-asserted-by":"crossref","unstructured":"EL Abel,  \"Physiol Behav.\"  58, \"Circannual changes in the duration of the immobility response of rats in the forced swim test.\" 591 (1995)","DOI":"10.1016\/0031-9384(95)00098-4"},{"key":"2","doi-asserted-by":"crossref","unstructured":"AA Abuzeineh, RD Owen, NE McIntyre, et al.  \"Southwest Nat.\"  52, \"Response of marsh rice rat (Oryzomys palustris) to inundation of habitat.\" 75 (2007)","DOI":"10.1894\/0038-4909(2007)52[75:ROMRRO]2.0.CO;2"},{"key":"3","doi-asserted-by":"crossref","unstructured":"A Armario, A Gavalda, O Marti,  \"Eur J Pharm.\"  158, \"Forced swimming test in rats: effect of desipramine administration and the period of exposure to the test on struggling behavior, swimming, immobility and defecation rate.\" 207 (1988)","DOI":"10.1016\/0014-2999(88)90068-4"},{"key":"4","doi-asserted-by":"crossref","unstructured":"M Bernardi, S Genedani, S Tagliavini, et al.  \"Behav Neurosci.\"  103, \"Effect of castration and testosterone in experimental models of depression in mice.\" 1148 (1989)","DOI":"10.1037\/\/0735-7044.103.5.1148"},{"key":"5","doi-asserted-by":"crossref","unstructured":"H Bonilla-Haime, O Limon-Morales, M Arteaga-Silva, et al.  \"Physiol Behav.\"  101, \"Orchiectomy modifies the antidepressant-like response of nicotine in the forced swimming test.\" 456 (2010)","DOI":"10.1016\/j.physbeh.2010.07.011"},{"key":"6","unstructured":"FH Bronson  and PD Heideman  \"The Physiology of Reproduction.\"  \"Seasonal Regulation of Reproduction in Mammals.\" 541 (1994)"},{"key":"7","doi-asserted-by":"crossref","unstructured":"J Dark  and I Zucker  \"Am J Physiol.\"  247, \"Gonadal and photoperiodic control of seasonal body weight changes in male voles.\" R84 (1984)","DOI":"10.1152\/ajpregu.1984.247.1.R84"},{"key":"8","doi-asserted-by":"crossref","unstructured":"J Dark, CS Whaling, I Zucker,  \"Horm Behav.\"  21, \"Androgens exert opposite effects on body mass of heavy and light meadow voles.\" 471 (1987)","DOI":"10.1016\/0018-506X(87)90005-5"},{"key":"9","doi-asserted-by":"crossref","unstructured":"GE Demas, RR Bowers, TJ Bartness, et al.  \"Am J Physiol Regul Integr Comp Physiol.\"  282, \"Photoperiodic regulation of gene expression in brown and white adipose tissue of Siberian hamsters (Phodopus sungorus).\" R114 (2002)","DOI":"10.1152\/ajpregu.2002.282.1.R114"},{"key":"10","doi-asserted-by":"crossref","unstructured":"MJ Duncan  and BD Goldman  \"J Exp Zool.\"  230, \"Hormonal regulation of the annual pelage color cycle in the Djungarian hamster, Phodopus sungorus. 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(1987)","DOI":"10.1016\/0024-3205(87)90712-0"}],"container-title":["Zoological Science"],"original-title":[],"deposited":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T22:52:26Z","timestamp":1791240746000},"score":1,"resource":{"primary":{"URL":"https:\/\/bioone.org\/journals\/zoological-science\/volume-42\/issue-5\/zs240114\/Regulation-of-Reproduction-and-Swimming-Ability-in-the-Male-Marsh\/10.2108\/zs240114.full"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,9,3]]},"references-count":49,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2025,10,1]]}},"URL":"https:\/\/doi.org\/10.2108\/zs240114","relation":{},"ISSN":["0289-0003","2212-3830"],"issn-type":[{"value":"0289-0003","type":"print"},{"value":"2212-3830","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,9,3]]}}}