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首页> 外文期刊>The Veterinary Journal >AGE AND HOURLY RELATED CHANGES OF SERUM TESTOSTERONE AND SPERMIOGRAM OF PREPUBERTAL BULLS FED TWO LEVELS OF NUTRITION
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AGE AND HOURLY RELATED CHANGES OF SERUM TESTOSTERONE AND SPERMIOGRAM OF PREPUBERTAL BULLS FED TWO LEVELS OF NUTRITION

机译：饲喂2个营养水平的血清睾丸激素和产前牛睾丸的年龄及其与小时相关的变化。

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Serum testosterone concentrations and the spermiograms of prepuberal bulls fed two levels of protein diets were investigated at 7, 10, 14 and 18 months of age. Scrotal circumference, body condition score and total sperm counts of those animals on a high protein diet were significantly (P<0.05) higher than those on a low protein diet. However, sperm motility, total dead sperm and abnormal sperm did not differ between the treatment groups (P<0.05). One bull fed a high protein diet had significantly higher testosterone concentrations (basal and peak) than a bull fed low protein throughout the four sampling periods (P<0.05). Testosterone concentrations, scrotal circumference, volume of semen, sperm concentration and sperm output of bulls on low and high protein diets increased significantly with age (P<0.05). Peak testosterone concentrations ranged from 1.1 ng ml(-1) at 7 months to a maximum of 5.3 ng ml(-1) at 18 months. The 24 h secretory patterns of testosterone were episodic, pulsatile or temporal in nature. The peaks occurred mostly in;he morning hours and ranged from one to five in number. Protein intake in prepubertal hulls could have significant influence on spermiogram and testosterone production.
机译：在7、10、14和18个月大时，对饲喂两种蛋白质饮食水平的青春期前公牛的血清睾丸激素浓度和精子图进行了研究。高蛋白饮食的那些动物的阴囊周长，身体状况评分和精子总数明显高于低蛋白饮食的那些（P <0.05）。然而，治疗组之间精子活力，总死精和异常精子无差异（P <0.05）。在四个采样期内，饲喂高蛋白饮食的公牛的睾丸激素浓度（基础和峰值）显着高于饲喂低蛋白的公牛（P <0.05）。低蛋白饮食和高蛋白饮食的公牛睾丸激素浓度，阴囊周长，精液量，精子浓度和精子产量随着年龄的增长而显着增加（P <0.05）。最高睾丸激素浓度在7个月时为1.1 ng ml（-1）至18个月时最大为5.3 ng ml（-1）。睾丸激素的24小时分泌模式本质上是间歇性，搏动性或暂时性的。高峰期多发生在早晨，数量从一到五不等。青春期前船体的蛋白质摄入量可能会对精子图和睾丸激素的产生产生重大影响。

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