Ju Tz-Chuen, Tsao Kai-Chien, Liu Tzu-Yu, Yang Shyi-Kuen
Department of Animal Science and Biotechnology, Tunghai University, Taichung 40704, Taiwan.
Animals (Basel). 2021 Feb 26;11(3):614. doi: 10.3390/ani11030614.
In this study, the effects of a nocturnal light pulse on body weight, organ mass, gonadal function, and plasma levels of metabolites were determined in male mule ducks. In total, 32 15-week-old mule ducks were randomly allocated to either Group C (control group) or L+ (lighting group). Group C was exposed to the natural photoperiod, whereas Group L+ was provided with a 1-h lighting over 20:00-21:00 every day, in addition to the natural photoperiod. At the end of the 42-day experiment, Group L+ had significantly lower relative weights (% of live weight) of the digestive tract and abdominal fat and higher relative weights of the breast meat and testes than Group C. Moreover, Group L+ had significantly higher plasma testosterone and lower plasma glucose levels. However, no between-group differences were observed in the triacylglycerol and uric acid levels. Histological examination demonstrated that the seminiferous tubule diameter was larger in Group L+ than in Group C. Moreover, the meiosis stage in spermatogenesis had begun in Group L+ but not in Group C. In conclusion, the supplemented 1-h lighting at 20:00 stimulated gonadal development and function and reduced fat deposition.
在本研究中，测定了夜间光脉冲对雄性骡鸭体重、器官质量、性腺功能和血浆代谢物水平的影响。总共32只15周龄的骡鸭被随机分配到C组（对照组）或L+组（光照组）。C组暴露于自然光照周期，而L+组除自然光照周期外，每天20:00至21:00额外提供1小时光照。在42天实验结束时，L+组的消化道和腹部脂肪相对重量（占活体重的百分比）显著低于C组，而胸肉和睾丸的相对重量则高于C组。此外，L+组的血浆睾酮水平显著较高，血浆葡萄糖水平较低。然而，两组之间的三酰甘油和尿酸水平没有差异。组织学检查表明，L+组的生精小管直径大于C组。此外，L+组精子发生的减数分裂阶段已经开始，而C组尚未开始。总之，20:00补充1小时光照可刺激性腺发育和功能，并减少脂肪沉积。
