The objective of this study was to evaluate the effect of breed and age on scrotal measurements and semen characteristics of Saanen and Toggenburg bucks raised under extensive system in the tropic. The study was conducted using Toggenburg and Saanen bucks; the bucks were allocated into two different groups based on breed and age in 2 × 2 factorial completely randomized design. The body weight was determined using a hanging weighing scale expressed in kilogrammes (kg). Scrotal circumference and scrotal length were measured using metal measuring tape. Semen characteristics evaluated were volume, consistency, mass activity and progressive motility, live sperm cells, normal morphology and spermatozoa concentration. The current study found that breed of bucks had no influence on body weight, scrotal circumference, scrotal length, volume, mass activity, progressive motility, live sperm cells and sperm morphology. The study also found that Toggenburg bucks had higher semen consistency and spermatozoa concentration as compared with Saanen bucks. Therefore, it can be concluded that Toggenburg bucks can produce high number of total spermatozoa and as a result higher semen doses for artificial insemination purposes. Further studies with more number of animals are recommended.

这项研究的目的是评估品种和年龄对热带地区广泛种植的萨嫩和托根雄鹿的阴囊测量和精液特性的影响。该研究是使用Toggenburg和Saanen雄鹿进行的；在2×2阶乘完全随机设计中，根据品种和年龄将雄鹿分为两个不同的组。使用悬挂式体重计确定体重，该体重计以千克（kg）表示。使用金属卷尺测量阴囊周长和阴囊长度。评估的精液特征为体积，稠度，质量活性和进行性运动，活精细胞，正常形态和精子浓度。目前的研究发现，雄鹿的繁殖对体重，阴囊周长，阴囊长度，体积，质量活动，进行性运动，活精子细胞和精子形态。研究还发现，与萨嫩雄鹿相比，Toggenburg雄鹿的精液稠度和精子浓度更高。因此，可以得出结论，Toggenburg bucks可以产生大量的总精子，因此出于人工授精的目的需要较高的精液剂量。建议对更多动物进行进一步研究。