Gibson Michaela, Hickson Rebecca, Back Penny, Dittmer Keren, Schreurs Nicola, Rogers Chris
School of Agriculture and Environment, Massey University, Private Bag 11-222, 4442 Palmerston North, New Zealand.
School of Veterinary Sciences, Massey University, Private Bag 11-222, 4442 Palmerston North, New Zealand.
Animals (Basel). 2021 Mar 5;11(3):694. doi: 10.3390/ani11030694.
In cattle, limited data have been reported about the relationship between live weight, bone size, and strength and how this relationship can be altered by factors such as sex and age. The aim of this study was to describe the relationship of peripheral quantitative computed tomography (pQCT)-derived parameters of bone strength and morphology with live weight, age and sex in beef-cross-dairy cattle. All animals were weighed the day before slaughter. The metacarpus and humerus were collected at slaughter and scanned at the mid-diaphysis using pQCT. Live weight was the primary explanatory variable for bone size and strength in all cohorts. However, the effect of age was significant, such that magnitude of response to liveweight was less in the 24-month-old cohort. Sex was significant within cohorts in that bulls had a shorter metacarpus than steers and heifers had a shorter metacarpus than steers at age of slaughter.
在牛身上，关于活重、骨骼大小和强度之间的关系以及这种关系如何受到性别和年龄等因素影响的报道数据有限。本研究的目的是描述在肉用杂交奶牛中，通过外周定量计算机断层扫描（pQCT）得出的骨强度和形态学参数与活重、年龄和性别的关系。所有动物在屠宰前一天称重。在屠宰时采集掌骨和肱骨，并使用pQCT在骨干中部进行扫描。在所有队列中，活重是骨大小和强度的主要解释变量。然而，年龄的影响显著，以至于在24月龄的队列中，对活重的反应幅度较小。在各队列中，性别差异显著，即公牛的掌骨比阉牛短，而在屠宰年龄时，母牛的掌骨比阉牛短。
