Abstract：
Linear type traits are easily measurable phenotypic characteristics that help breed characterization, selection of animals for breeding and found to be associated with animals\' performance. Unlike cows, there have been limited studies linking body linear traits with male reproductive ability and semen cryo-preservability of breeding bulls. Present study reported the age-related changes in body linear type traits in Frieswal (N = 378) dairy bulls and its relevance with reproductive potentials of breeding bulls. Our results indicated that body frame size traits were significantly and positively correlated with gonadal linear traits. Among the selected body mophometric parameters body length, chest girth and head circumference were the important body linear type traits having capability to discriminate between bulls of frozen semen doses (FSD) and non-FSD categories. Discriminant function has been developed based on body linear traits of crossbred dairy bulls to find out males of superior reproductive potentials. Our finding provided evidence that body length (humerous tuberosity to tuber ischii) was the most powerful linear body trait associated with breeding bulls\' reproductive ability and semen quality.
摘要：
线性型性状是易于测量的表型特征，有助于品种表征，选择用于繁殖的动物，并发现与动物的表现有关。不像奶牛,有有限的研究将身体线性性状与雄性繁殖能力和繁殖公牛的精液冷冻保存能力联系起来。本研究报告了Frieswal（N=378）奶牛的身体线性型性状的年龄相关变化及其与繁殖公牛繁殖潜力的相关性。我们的结果表明，体格大小性状与性腺线性性状呈显着正相关。在选定的身体运动参数身体长度中，胸围和头围是重要的身体线性型特征，能够区分冷冻精液剂量（FSD）和非FSD类别的公牛。已根据杂交公牛的身体线性特征开发了判别函数，以找出具有优越生殖潜力的雄性。我们的发现提供了证据，表明体长（块茎坐骨的结节）是与繁殖公牛的繁殖能力和精液质量相关的最强大的线性体性状。
