Abstract：
Puberty is part of physiological processes including growth, adrenarche, menarche, energy balance and metabolism. This study describes the dynamic between both metabolic and reproductive statutes during pubertal growth in Saharan breed sheep. Once weaned (3 months age), two lots of lambs are made up and each one receive a barley supplementation ration of 250 vs 500 g/head/day in addition to season\'s diet. Biometric measurements and blood samples are collected once a month from 3 to 12 months of age in order to evaluate biochemical and sexual hormonal status. Results show a significant weight gain and growth level in the double dose lot. Changes in biochemical parameters are closely related with age at least for glycemia and total proteinemia. Androgenic profile shows individual fluctuations (0.02 to 3.47 μg /ml) due to age, season and feeding ratio. In accordance with our findings, the diet effect is clearly evidenced between the two batches, it\'s noted that plasma concentration of androgens is the lowest (<0.30 ng /ml) at 3 months and increases to 0.53 vs 0.76 ng /ml between 4 and 6 months confirming the pre-pubertal phase. Also, biometric and biochemical parameters are tightly correlates with plasma androgen changes, depending on whether the animal be pubescent or not. In conclusion, although interesting this study shows no early puberty onset in the barley supplemented lambs as was reported in other sheep breeds; nevertheless, the testis activity as well as the body fitness have clearly be enhance. The synergy between biochemical profiles and biometric measurements explain the metabolic function of testicular androgens at puberty.
摘要：
青春期是生理过程的一部分，包括生长，肾上腺素,初潮,能量平衡和新陈代谢。这项研究描述了撒哈拉品种绵羊青春期生长过程中代谢和生殖状态之间的动态。一旦断奶（3个月大），两批羔羊是做了，每一个收到250比500克/头/天的大麦补充配给，除了季节的饮食。从3至12月龄每月一次收集生物测量和血液样品以评估生化和性激素状态。结果显示在双剂量批次中显著的体重增加和生长水平。生化参数的变化至少与血糖和总蛋白血症的年龄密切相关。雄激素谱显示个体波动（0.02至3.47μg/ml），由于年龄，季节和饲养比。根据我们的发现,饮食效果在两个批次之间得到了明显的证明，它指出，雄激素的血浆浓度是最低的（<0.30ng/ml）在3个月和增加到0.53比0.76ng/ml在4和6个月确认青春期前阶段。此外，生物特征和生化参数与血浆雄激素变化密切相关，取决于动物是否青春期。总之,尽管有趣的是，这项研究表明，没有像其他绵羊品种报道的那样，大麦补充羔羊的青春期早期发作；然而，睾丸活动和身体素质都有明显的增强。生化谱和生物测量之间的协同作用解释了青春期睾丸雄激素的代谢功能。
