The semen movement and sperm head size patterns of boar ejaculates were analysed using computer-assisted semen analysis (CASA)-Mot and -Morph systems. The aim of the present study was to compare morphometric and kinematics variables from boars and to determine the relationship with sow fertility variables related to litter size. The females were from maternal crossing schemes such as the continuous 3-generation cross between York (Y), Landrace (L), and Pietrain (P) hybrid sows and Pietrain boars. Semen samples were collected from 11 sexually mature boars from two sire lines. Samples were analysed using the ISAS^®v1 system to evaluate eight kinematic variables of sperm velocity, progressiveness and undulations. Four morphometric parameters of sperm head size (length, width, area and perimeter) were analysed. Bayesian analysis revealed relevant differences in four kinematic variables (VSL, LIN, STR and WOB) between sire lines, with a probability of relevance (P_R) of 0.79–0.91, and Pietrain boars were associated with higher progressive motility compared with Duroc x Pietrain boars. Moreover, there were relevant differences in all morphometric variables (P_R = 0.82–0.85) between sire lines. The dam line Y-L-50 (½ Y × ½ L) had higher total born per litter and piglets born alive, and YLP-75 (¹/₈ Y × ¹/₈ L × ³/₄ P) was associated with higher values of litter weight at birth (highest posterior density region at 95% = 9.92, 16.41 kg). There are relevant differences in kinematic variables between the assessed sire lines and the differences in morphometric and litter size variables were also relevant. The York-Landrace hybrid sows had higher total born per litter and piglets born alive, and there were relevant differences when compared with YLP-50 (¼ York × ¼ Landrace × ½ Pietrain). Differences in kinematic and morphometric variables between sire and dam lines related to fertility need to be further studied.

中文翻译：

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公猪精子运动学和头部形态测量学的贝叶斯分析及其与产仔数生育力变量的关系

使用计算机辅助精液分析 (CASA)-Mot 和 -Morph 系统分析了公猪射精的精液运动和精子头部大小模式。本研究的目的是比较公猪的形态测量和运动学变量，并确定与产仔数相关的母猪繁殖力变量的关系。雌性来自母系杂交计划，例如约克 (Y)、长白 (L) 和皮特兰 (P) 杂种母猪与皮特兰公猪之间的连续 3 代杂交。从来自两个父系的 11 头性成熟公猪收集精液样本。使用 ISAS ^®分析样品v1 系统用于评估精子速度、渐进性和波动的八个运动学变量。分析了精子头部大小的四个形态测量参数（长度、宽度、面积和周长）。贝叶斯分析揭示了父系之间四个运动学变量（VSL、LIN、STR 和 WOB）的相关差异，相关概率 ( P _R ) 为 0.79–0.91，并且与 Duroc x Pietrain 相比，Pietrain 公猪与更高的渐进运动性相关公猪。此外， 父系之间的所有形态测量变量（P _R = 0.82-0.85）都存在相关差异。母猪品系 YL-50 (½ Y × ½ L) 每窝产仔数和活产仔猪总数更高，而 YLP-75 ( ¹ / ₈ Y ×  ¹/ ₈ L ×  ³ / ₄ P) 与出生时较高的窝重值相关（最高后密度区域为 95% = 9.92, 16.41 kg）。评估的种系之间的运动学变量存在相关差异，形态测量和产仔数变量的差异也相关。York-Landrace 杂交母猪的每窝总产仔数和活产仔猪数更高，与 YLP-50（¼ York × ¼ Landrace × ½ Pietrain）相比存在相关差异。需要进一步研究与生育相关的父系和母系之间运动学和形态测量变量的差异。