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Grouping previously unknown bucks is a stressor with negative effects on reproduction

机译：分组以前未知的雄鹿是压力，对繁殖产生负面影响

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Grouping previously unknown animals produces social stress, which might have negative effects on reproduction. The aims of the experiment were to determine if grouping unknown bucks (1) triggers a stress response and produces changes in body weight; (2) affects scrotal circumference, testosterone concentration, and semen quality; and (3) has differential effects between resident and introduced bucks. One group of nine Saanen bucks was transported and introduced (introduced bucks, group IG) to a group of eight Saanen bucks (resident bucks, group RG). On day 0, cortisol concentration and rectal temperature were determined, and from day -7 to day 29, body weight, scrotal circumference, and testosterone concentration were recorded and semen quality was determined. The stress response was different between groups: on several moments on day 0, resident bucks had greater cortisol concentration (P0.0001), while introduced bucks had higher rectal temperature (P=0.02). Body weight decreased similarly in both groups from day -7 to day 2 (P0.0001), but on day 29, IG bucks were lighter than RG bucks (P=0.05). Also, the reproductive response differed between groups: introduced bucks had lower scrotal circumference (P0.01), lower testosterone concentration (P=0.02), and lower percentage of motile spermatozoa in the ejaculate (P=0.05). It was concluded that grouping unknown bucks was stressful and negatively affected the reproduction, being more serious for the introduced than the resident bucks.
机译：将先前未知的动物分组会产生社会压力，这可能对繁殖产生负面影响。实验的目的是确定将未知的雄鹿分组（1）是否会触发压力反应并产生体重变化; （2）影响阴囊周长，睾丸激素浓度和精液质量; （3）在居民和引进的雄鹿之间有不同的影响。运输了一组九萨那雄鹿，并将其引入（引入的雄鹿，IG组）到一组八头萨南的雄鹿（居民雄鹿，RG组）。在第0天，测定皮质醇浓度和直肠温度，并在第-7天至第29天，记录体重，阴囊周长和睾丸激素浓度，并测定精液质量。两组之间的压力反应是不同的：在第0天的数分钟内，常驻雄鹿的皮质醇浓度较高（P <0.0001），而引入雄鹿的直肠温度较高（P = 0.02）。从第-7天到第2天，两组的体重均类似下降（P <0.0001），但在第29天，IG雄鹿比RG雄鹿轻（P = 0.05）。此外，各组之间的生殖反应也不同：引入的雄鹿的阴囊周长较低（P <0.01），睾丸激素浓度较低（P = 0.02），而精液中活动精子的百分比较低（P = 0.05）。得出的结论是，对未知雄鹿进行分组会产生压力，并对繁殖产生不利影响，对引进的雄鹿而言，其栖息情况要比驻地雄鹿更为严重。

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