{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,3]],"date-time":"2026-05-03T06:45:09Z","timestamp":1777790709418,"version":"3.51.4"},"reference-count":27,"publisher":"SAGE Publications","issue":"3","license":[{"start":{"date-parts":[[1986,9,1]],"date-time":"1986-09-01T00:00:00Z","timestamp":525916800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Biol Rhythms"],"published-print":{"date-parts":[[1986,9]]},"abstract":"<jats:p>It has been demonstrated that an endogenous mechanism is involved in photoperiodic time measurement in the mink, a short-day-breeding mannal. A study of testicular activity (testicular volume, plasma testosterone concentration) and plasma prolactin level was carried out in sexually resting minks (the experiment began in November). Groups of minks were kept in the natural photoperiod or subjected to different resonance light-dark (LD) cycles (LD 4:8, LD 4:20, LD 4:32, LD 4:44); an additional group of animals was reared in an ahemeral photoperiod (LD 4:16). A rapid increase of testicular activity was observed in control animals or those kept in LD 4:20 (T 24) and LD 4:44 (T 48). In the other groups of animals, those kept in LD 4:8 (T 12), LD 4:32 (T 36), and LD 4:16 (T 20), testicular function remained at rest. Prolactin secretion was, in contrast, stimulated in the groups kept in LD 4:8 (T 12). LD 4:32 (T 36), and LD 4:16 (T 20), and remained low in the groups kept in LD 4:20 (T 24) and LD 4:44 (T 48). These results show that the effects of the different photoperiodic regimens do not depend on the duration of the photophase, but rather on the period of the LD cycles. The LD cycles that allow an increase of testicular function are those that are inhibitory to repro duction in birds and long-day-breeding mammals. To explain these results, it is suggested that in the mink exposure to light during the circadian photosensitive phase induces inhibition of testicular activity and stimulation of prolactin secretion. To explain the opposite effects of a single photoperiod on testicular function and secretion of prolactin, the hypothesis has been advanced that, in the mink, long days might simultaneously inhibit hypothalamic luteinizing- hormone-releasing hormone (LH-RH) activity and prolactin-inhibiting factor (PIF) activity.<\/jats:p>","DOI":"10.1177\/074873048600100305","type":"journal-article","created":{"date-parts":[[2007,3,11]],"date-time":"2007-03-11T03:24:21Z","timestamp":1173583461000},"page":"231-241","source":"Crossref","is-referenced-by-count":13,"title":["Circadian Participation in the Photoregulation of Testis Activity and Prolactin Secretion in the Mink, a Short-Day Breeder"],"prefix":"10.1177","volume":"1","author":[{"given":"L.","family":"Boissin-Agasse","sequence":"first","affiliation":[{"name":"Laboratoire de Neurobiologie Endocrinologique, U. A. CNRS 1197, Universit\u00e9 de Montpellier-, Place Eug\u00e8ne-Bataillon, 34060 Montpellier-cedex, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J.M.","family":"Jacquet","sequence":"additional","affiliation":[{"name":"Laboratoire de Neurobiologie Endocrinologique, U. A. CNRS 1197, Universit\u00e9 de Montpellier-, Place Eug\u00e8ne-Bataillon, 34060 Montpellier-cedex, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A.","family":"Lacroix","sequence":"additional","affiliation":[{"name":"Centre d' \u00c9tudes Biologiques des Animaux Sauvages, L. P. CNRS 4701, For\u00eat de Chiz\u00e9, Villiers-en-Bois, 79360 Beauvoir-sur-Niort, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J.","family":"Boissin","sequence":"additional","affiliation":[{"name":"Laboratoire de Neurobiologie Endocrinologique, U. A. CNRS 1197, Universit\u00e9 de Montpellier-, Place Eug\u00e8ne-Bataillon, 34060 Montpellier-cedex, France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[1986,9,1]]},"reference":[{"key":"atypb1","doi-asserted-by":"publisher","DOI":"10.1095\/biolreprod27.5.1062"},{"key":"atypb2","unstructured":"Boissin, J., M. Jallageas, and I. Assenmacher (1980) Cycle annuel du fonctionnement testiculaire des oiseaux et des mammif\u00e8res: R\u00e9gulation par les facteurs de l'environnement et influence des interretions testo-thyro\u00efdiennes. In Rythmes et Reproduction, R. Ortavant and A. Reinberg, eds., pp. 141-155, Masson, Paris."},{"key":"atypb3","first-page":"227","volume":"75","author":"Boissin-Agasse, L.","year":"1979","journal-title":"J. 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