Poclín-Rojas Annie Y, Arbaiza Barnechea Martin Daniel, Segura Portocarrero Gleni T, Ampuero-Trigoso Gustavo, Bernilla Carrillo Diana, Depaz-Hizo Benjamín A, Vásquez-Tarrillo Ronald W, Diaz-Quevedo Clavel, Quispe-Ccasa Hurley A
Laboratorio de Biotecnología Animal, Instituto Nacional de Innovación Agraria, Juan Guerra 22400, Peru.
Estación Experimental Agraria El Porvenir, Instituto Nacional de Innovación Agraria, Juan Guerra 22400, Peru.
Animals (Basel). 2025 Aug 21;15(16):2451. doi: 10.3390/ani15162451.
Under tropical conditions, seasonal variations may also influence the sperm characteristics of . The objective was to evaluate the motility of thawed sperm of bulls from the Peruvian tropics throughout the year. Over 24 months, 129 ejaculates were evaluated based on semen quality and subjected to slow horizontal freezing in 0.5 mL straws. After thawing, the individual, seasonal period, and season effect on motility and kinetic parameters were analyzed using a Sperm Class Analyzer (Microptic S.L.U., Barcelona, Spain). There was an individual effect on volume, motility, fresh concentration, and kinetic parameters when thawed. In the dry period, higher straight-line velocity (VSL) ( < 0.05) and beat cross frequency (BCF) were found than in the rainy period ( < 0.01). In summer and autumn, there was greater total motility, fast, circular routes, curvilinear velocity, average path velocity, VSL, amplitude of lateral displacement of the head, and BCF ( < 0.01). Greater volume and motility were found in winter and spring, but in summer and autumn, greater speed and vigor of movement were obtained in thawed sperm. The variation in annual climate patterns influences the seminal quality of bulls, and its effect needs to be assessed to propose adaptation strategies to climate change in tropical areas.
在热带条件下，季节变化也可能影响……的精子特征。目的是评估秘鲁热带地区公牛解冻精子全年的活力。在24个月的时间里，根据精液质量对129份射精样本进行了评估，并将其置于0.5毫升细管中进行缓慢水平冷冻。解冻后，使用精子分类分析仪（西班牙巴塞罗那的Microptic S.L.U.公司）分析个体、季节时段和季节对活力及动力学参数的影响。解冻后，个体对体积、活力、新鲜浓度和动力学参数有影响。在旱季，直线速度（VSL）（<0.05）和鞭打交叉频率（BCF）高于雨季（<0.01）。在夏季和秋季，总活力、快速、圆周运动路径、曲线速度、平均路径速度、VSL、头部横向位移幅度和BCF更高（<0.01）。在冬季和春季发现体积和活力更大，但在夏季和秋季，解冻精子的运动速度和活力更强。年度气候模式的变化会影响公牛的精液质量，需要评估其影响，以提出热带地区适应气候变化的策略。
