安格斯公牛在炎热的天气里自愿进入阴凉处,降低阴囊皮下温度,提高精子质量。

IF 1.1 4区 农林科学 Q2 Veterinary Canadian journal of veterinary research = Revue canadienne de recherche veterinaire Pub Date : 2023-01-01
Abdallah Shahat, Juan Castillo, Jacob Thundathil, John Kastelic
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引用次数: 0

摘要

本研究的目的是确定公牛位置(阴凉处与无阴凉处)、阴囊皮下温度和环境温度与精子质量的关系。选取6头4 ~ 5岁的安格斯公牛,随机分为2组,每组3头,饲养在2个室外围栏内,其中1个室外围栏设有棚舍(~3.5 × 6 m, 2.5 m高,1侧敞开),以提供遮阳。每周电射精1次,连续9周。公牛自愿进入树荫≥15分钟(用游戏摄像机观察)的时间百分比随着环境温度的增加而增加,在环境温度< 25°C和> 33°C时分别从7.6%到86.7%不等。在10个最热的日子里,没有遮阳的公牛(对照组)的阴囊皮下温度(用植入的数据记录仪每小时测量一次)与环境温度直接相关。相反,在高环境温度下,进入阴凉处的公牛阴囊皮下温度较低(P = 0.001),特别是当它们进入阴凉处时。在最热的4天里,这些公牛在中午12点到下午5点(环境温度最高)的大部分时间里都自愿进入阴凉处。精子总形态异常和顶体完整性存在组效应(P = 0.001),顶体完整性存在时间效应(P = 0.009)。总精子活力和前进精子活力均存在组效应(P分别为0.001和0.023)。用计算机辅助精子分析(CASA)测量精子运动动力学,[平均路径速度(VAP)、曲线速度(VCL)、直线速度(VSL)、轨迹直线度(STR)和轨迹线性度(LIN)]也存在组效应(P分别为0.005、0.011、0.010、0.020和0.046)。总之,在炎热的天气里,公牛自愿进入阴凉处,这显著降低了阴囊皮下温度,提高了精子质量。
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Angus bulls voluntarily access shade during hot weather, reducing scrotal subcutaneous temperatures and improving sperm quality.

The objective of this study was to determine the relationship of bull location (shade versus no shade), scrotal subcutaneous and ambient temperatures, and sperm quality. Six Angus bulls (4 to 5 y) were randomly allocated into 2 groups of 3 bulls each, housed in 2 outdoor pens, with 1 containing a shed (~3.5 × 6 m and 2.5 m high, 1 open side) to provide shade. Semen was collected by electroejaculation once weekly for 9 wk. The percentage of time a bull voluntarily accessed shade for ≥ 15 min (observed with a game camera) increased with the ambient temperature and ranged from 7.6% to 86.7% for ambient temperatures of < 25°C and > 33°C, respectively. During the 10 hottest days, scrotal subcutaneous temperature (measured hourly with an implanted data logger) in the bulls without access to shade (control group) was directly associated with ambient temperature. Conversely, bulls with access to shade had lower (P = 0.001) scrotal subcutaneous temperatures during high ambient temperatures, particularly when they accessed shade. During the 4 hottest days, these bulls voluntarily accessed shade most of the time from 12:00 noon to 5:00 p.m. (peak ambient temperatures). For total sperm morphological abnormalities and acrosome integrity, there were group effects (P = 0.001 for each), plus a time effect for acrosome integrity (P = 0.009). For total and progressive forward sperm motility, there were group effects (P = 0.001 and 0.023, respectively). For sperm motility kinetics, which were measured with computer-assisted sperm analysis (CASA), [average path velocity (VAP), curvilinear velocity (VCL), straight line velocity (VSL), straightness of track (STR), and linearity of track (LIN)], there were also group effects (P = 0.005, 0.011, 0.010, 0.020, and 0.046, respectively). In summary, during hot weather, bulls voluntarily accessed shade, which significantly lowered scrotal subcutaneous temperatures and improved sperm quality.

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来源期刊
CiteScore
1.80
自引率
0.00%
发文量
58
审稿时长
>24 weeks
期刊介绍: The Canadian Journal of Veterinary Research, published by the Canadian Veterinary Medical Association, is Canada''s only veterinary research publication. This quarterly peer-reviewed online-only journal has earned a wide international readership through the publishing of high quality scientific papers in the field of veterinary medicine. The Journal publishes the results of original research in veterinary and comparative medicine.
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