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- W2557283406 abstract "Seasonal reproduction is one of the major biotechnical and economic constraints of sheep production in temperate latitudes. Treatments using extra light followed by melatonin implants have been used satisfactorily in open barns, farms and artificial insemination centres to produce out-of-season sexual activity in rams. The aim of the present study is to explore the possibility of replacing melatonin implants with continuous light (LL), which was recently shown to increase LH secretion similar to melatonin and/or pinealectomy. Four experiments during 4 consecutive years were conducted in 'Ile-de-France' rams. In each study, one group was systematically exposed to permanent light after a first photoperiodic treatment of 60 long days (LD-LL) during the winter and compared with various other control groups subjected either to a natural photoperiod or the classical LD-melatonin treatment. As expected, blood nocturnal melatonin secretion was suppressed by LL. In all four experiments, LL treatment produced a highly significant and robust increase in ram testicular volume in the spring compared with the testicular volume of control rams or of that of treated rams at the end of the LD. For the two experiments in which fertility was tested, fertility after hand-mating was significantly higher in LD-LL rams than in control rams (76% v. 64%). Therefore, permanent light after an LD treatment may be an interesting alternative to LD-melatonin treatment to induce out-of-season sexual activity in rams." @default.
- W2557283406 created "2016-12-08" @default.
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- W2557283406 date "2017-01-01" @default.
- W2557283406 modified "2023-09-23" @default.
- W2557283406 title "Continuous light after 2 months of long days stimulates ram testis volume and increases fertility in spring" @default.
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- W2557283406 doi "https://doi.org/10.1017/s1751731116002299" @default.
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