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Abstract：
A 5-year-old male Beagle dog produced ejaculates with a high percentage of spermatozoa with abnormal morphology, especially sperm tail defects. Although libido and semen volume were normal, ejaculates showed asthenospermia, oligozoospermia, and teratozoospermia. The spermatozoa exhibited morphologic defects affecting the flagellum, mainly coiled tails with or without macrocephalia (33.5 ± 2.1%), bent tails (18.3 ± 3.4%), and proximal cytoplasmic droplets (6.7 ± 2.8%). The peripheral plasma testosterone level was 2.76 ± 0.21 ng/mL. The resistive index and the pulsatility index from marginal and intratesticular vessels measured by Doppler ultrasound showed higher values in the right testicle than in the left testicle. Histologic evaluation revealed focal reduction in the number of germ cells and sperm in the seminiferous tubules in the right testicle. This is the first report that describes simultaneously the presence of sperm tail defects in the ejaculate and changes in the blood flow of testicular vessels in the dog.
摘要：
一只5岁的雄性比格犬产生的射精精子比例很高，形态异常，尤其是精子尾部缺陷.虽然性欲和精液量正常,射精显示弱精子症,少精子症,和畸形精子症.精子表现出影响鞭毛的形态缺陷，主要是有或没有大头孢的盘绕尾巴（33.5±2.1％），尾部弯曲(18.3±3.4%),和近端细胞质液滴（6.7±2.8％）。外周血睾酮水平为2.76±0.21ng/mL。通过多普勒超声测量的边缘和关节内血管的阻力指数和搏动指数在右睾丸中显示出比在左睾丸中更高的值。组织学评估显示，右睾丸生精管中生殖细胞和精子的数量减少。这是第一份同时描述射精中精子尾巴缺陷和狗睾丸血管血流量变化的报告。
