安格斯公牛性能测试期间气质、急性和慢性皮质醇及睾酮浓度与繁殖健全性之间的关系。
Relationships among temperament, acute and chronic cortisol and testosterone concentrations, and breeding soundness during performance testing of Angus bulls.
作者信息
Lockwood S A, Kattesh H G, Rhinehart J D, Strickland L G, Krawczel P D, Wilkerson J B, Kirkpatrick F D, Saxton A M
机构信息
Department of Animal Science, University of Tennessee, Knoxville, Tennessee, USA.
Department of Animal Science, University of Tennessee, Knoxville, Tennessee, USA.
出版信息
Theriogenology. 2017 Feb;89:140-145. doi: 10.1016/j.theriogenology.2016.10.019. Epub 2016 Oct 31.
The aim of this study was to examine relationships among temperament, endocrinology, and reproductive parameters of bulls enrolled in an 84-day performance test. Angus bulls (n = 60) were housed in six pens grouped by age and weight. Pen scores (PS; 1 = docile to 5 = very aggressive) were assigned on Days -1, 27, 55, and 83 of the performance test. On the following day, blood and hair samples were collected, and body weight (BW) and exit velocity (EV) were recorded. Bulls were split into two categories based on; Day -1 PS (PScalm = PS 1 or 2; PSexcitable = PS 3 or 4) and Day 0 EV (EVcalm = slowest 20 bulls; EVexcitable = fastest 20 bulls). Cortisol and testosterone concentrations in serum and hair did not differ (P > 0.10) between PS or EV temperament categories. Sampling day differences (P < 0.01) occurred for serum testosterone, hair cortisol, and hair testosterone concentration; however, serum cortisol concentration did not differ (P > 0.10) over the sampling days. Serum testosterone concentration increased (P < 0.01) from Day 0 to 28, decreased from Day 28 to 56, but Day 84 did not differ from Day 0, 28, or 56. Hair cortisol concentration was greatest (P < 0.01) on Day 0, decreased from Day 28 to 56 but did not differ from Day 56 to 84. Hair testosterone concentration was greatest (P < 0.01) on Day 0 and remained constant from Day 28 to 84. Bulls categorized as PScalm had a greater (P < 0.01) percentage of normal sperm and secondary defects (P < 0.01) when compared with PSexcitable bulls. However, EVcalm bulls had fewer (P < 0.01) primary defects but more (P < 0.01) secondary defects than EVexcitable bulls. In conclusion, bulls exhibited physiological evidence of acclimation during the test as indicated by a reduction in hair cortisol concentration. In addition, the ability of the bulls to acclimate while residing at the testing center may have contributed to little differences observed during the breeding soundness examination portion of the performance test.
本研究的目的是检验参加84天性能测试的公牛的气质、内分泌学和生殖参数之间的关系。安格斯公牛（n = 60）按年龄和体重分组饲养在六个围栏中。在性能测试的第-1、27、55和83天给出围栏评分（PS；1 = 温顺至5 = 非常好斗）。在接下来的一天，采集血液和毛发样本，并记录体重（BW）和出口速度（EV）。公牛根据第-1天的PS（PS平静 = PS 1或2；PS易兴奋 = PS 3或4）和第0天的EV（EV平静 = 最慢的20头公牛；EV易兴奋 = 最快的20头公牛）分为两类。血清和毛发中的皮质醇和睾酮浓度在PS或EV气质类别之间没有差异（P > 0.10）。血清睾酮、毛发皮质醇和毛发睾酮浓度存在采样日差异（P < 0.01）；然而，血清皮质醇浓度在采样日之间没有差异（P > 0.10）。血清睾酮浓度从第0天到第28天增加（P < 0.01），从第28天到第56天下降，但第84天与第0、28或56天没有差异。毛发皮质醇浓度在第0天最高（P < 0.01），从第28天到第56天下降，但从第56天到第84天没有差异。毛发睾酮浓度在第0天最高（P < 0.01），从第28天到第84天保持不变。与PS易兴奋的公牛相比，PS平静的公牛正常精子百分比更高（P < 0.01），二级缺陷更多（P < 0.01）。然而，EV平静的公牛一级缺陷比EV易兴奋的公牛少（P < 0.01），但二级缺陷更多（P < 0.01）。总之，公牛在测试期间表现出适应的生理证据，表现为毛发皮质醇浓度降低。此外，公牛在测试中心居住期间的适应能力可能导致在性能测试的繁殖健全性检查部分观察到的差异很小。
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