Abstract: The present experiment was performed in order to study whether photoperiods affect the body weight，gonadal weight,plasma testosterone concentration and pineal melatonin content in male plateau pika (Ochotona curzoniae) during their restoration phase The main results a re as follows：
(1)The weights of testes (932．3± 79．3 mg／pair／100gBW ，n=15)，epididymis (171．1±13.8rng／pair／100gBW ,n= 15),deferent duct(7.9± 0.5mg／pair／100gBW ，n=15)and seminal vesicle(47．7±5．3mg／100gBW ，n=1 5)of the long photoperiod group were higher than that of the short photoperiod group and the natural light group．(2)Plasma testosterone(u< 0．001)concentration (1 537．4±143．5 pg／ml，n=1 5)of the long photoperiod group was still higher than that of the other two groups．(3) The weight of pineal gland(1．5±0．1mg，n =1 5)and the content of melatonin(89.7±5.8pg／pineal gland，n=6) of long photoperiod group were lower than that of the other two groups.
The results suggested that the change of neuroendocrine gonad axis to the outside of photoperid has sentitivity．Therefore it may be infer utilization the change of photoperiod to plateau pika in the ecological environment could be regulate the seasonal breeding.

Key words: Plateau pika (Ochotona curzoanae), Photoperiod, Gonads, Testosterone Melatonin

摘要： 本项研究将野外捕获的成年雄性高原鼠兔(Ochotona curzoniae)分3组进行不同光制的饲养。以检验光周期对其神经内分泌—生殖轴功能的影响：(1)长光照组睾丸及附属性腺的重量和血浆睾酮水平均明显高于自然光组(p<0.05)和短光照组(p<0．01);(2)长光照组的松果腺重量(1．5士0.1毫克，n=15)和褪黑激素古量(89．7±5．8徽徽克／松果腺)，均显著低于其它两组；(3)自然光组和短光照组性腺的显著萌发表明，在高原鼠兔季节性繁殖的年周期中，其神经内分泌——生殖轴对春分前短光照的抑制作用具有不应期。

关键词: 高原鼠兔, 光周期, 性线, 睾酮, 褪黑激素