动物气质对牛肉公牛的身体和生殖发育的影响
Mariana Karla Francolino da Silva1, Marcilio Nichi1, Marcelo Sant'Ana Borges2
1Department of Animal Reproduction, São Paulo University (USP), São Paulo, São Paulo, Brazil.
Animal reproduction science
|February 1, 2025
概括
雄牛的反应性气质与身体发育和精液质量低下有关,但不影响性成熟. 宁静的公牛表现出比反应性公牛更好的生长和生殖指标.
科学领域:
- 动物科学 动物科学
- 生殖生物学 生殖生物学
- 行为科学 行为科学
背景情况:
- 牛的反应性气质与生产力和生殖成功的降低有关.
- 气质对雄性牛的性发育和早熟性的影响仍未得到充分研究.
研究的目的:
- 为了调查反应性雄牛表现出延迟的性发育和较差的生殖表现的假设.
- 为了评估气质,生长,性成熟和杂交公牛的精液质量之间的关系.
主要方法:
- 行为评估将40只杂交牛分为冷静 (CA) 和反应性 (RE) 组.
- 测量包括体重增加,皮质醇和水平,青春期开始,精子质量,冷耐受性,丸超声波和丸活检.
- 通过电射精收集精液,并进行冷保存测试.
主要成果:
- 冷静 (CA) 动物的总体,平均和每日体重增加显著增加.
- 与CA动物相比,反应性 (RE) 牛的精子缺陷比例较高,膀腺发育减少.
- 没有发现气质对性早成,冷耐受性或激素产生有显著影响,尽管在RE动物中皮质醇水平趋向更高.
结论:
- 气质不会影响公牛达到青春期的年龄.
- 与平静的公牛相比,反应性公牛在身体发育,膀腺发育和新鲜精液质量方面表现较差.
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