Department of Environment Hygiene and Animal Welfare, Wrocław University of Environmental and Life Sciences, Chełmońskiego 38C, 50-576, Wrocław, Poland.
Department of Ruminant Science, West Pomeranian University of Technology, ul. Klemensa Janickiego 29, 71-270, Szczecin, Poland.
Sci Rep. 2021 May 27;11(1):11116. doi: 10.1038/s41598-021-90630-8.
The aim of this study was to analyze the relationship between the concentration of hormones in the seminal plasma, the bull maintenance system in the insemination station, and the regularity of sperm donation and the response to the phantom (libido level). An additional goal was to determine whether there is a relationship between the hormonal profile in the blood, the sperm plasma, the oxidative and antioxidant profile in the blood of bulls and the biometry of their testicles and scrotum, as well as the quality of their sperm in both different seasons and intensities of reproductive use. For the study, 220 healthy and sexually mature Polish Holstein-Friesian bulls were used. They all had normal libido and were fed equally. The animals were grouped according to the scheme: young (16-20 month/n = 60) and old (26-30 month/n = 60) including: individually housed (n = 30) and group housed (n = 30) young, old individually housed (n = 30) and group housed (n = 30) (n total animals = 120); young animals donating semen once a week (every Thursday) (n = 25) and sporadically (once every two months on a random day of the week) (n = 25), old animals donating semen once a week (every Thursday) (n = 25 ) and sporadic donors (once every two months on a random day of the week) (n = 25) (n total animals = 100). When analyzing the results of this study, it should be stated that regular use has a positive effect on the secretion of sex hormones in bulls. Higher levels of testosterone and lower levels of estradiol and prostaglandins resulted in higher sexual performance, expressed by a stronger response to the phantom. The differences in favor of regular use were independent of the bull's age. The results of our research illustrate that the quality of semen and its freezing potential may depend on the season and frequency of its collection, as well as on the age of the males.
本研究旨在分析精液中激素浓度、公牛在授精站的饲养系统、捐精的规律性与幻肢（性欲水平）反应之间的关系。另一个目的是确定公牛血液中的激素谱、精子浆、血液中的氧化和抗氧化谱与睾丸和阴囊的生物计量学以及精子质量之间是否存在关系，以及在不同的繁殖季节和强度下。为此，使用了 220 头健康且性成熟的波兰荷斯坦-弗里森公牛。它们的性欲都正常，饲料也一样。动物按以下方案分组：青年（16-20 月龄/n=60）和老年（26-30 月龄/n=60），包括：单独饲养（n=30）和群体饲养（n=30）青年，老年单独饲养（n=30）和群体饲养（n=30）（总动物数 n=120）；每周（每周四）定期捐精的青年动物（n=25）和不定期捐精的青年动物（每月两次，在每周的任意一天）（n=25），每周（每周四）定期捐精的老年动物（n=25）和不定期捐精的老年动物（每月两次，在每周的任意一天）（n=25）（总动物数 n=100）。在分析这项研究的结果时，应该指出的是，定期使用对公牛的性激素分泌有积极影响。较高水平的睾酮和较低水平的雌二醇和前列腺素导致更高的性表现，表现为对幻肢的反应更强。这种定期使用的差异与公牛的年龄无关。我们的研究结果表明，精液质量及其冷冻潜力可能取决于精液采集的季节和频率，以及雄性动物的年龄。
