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卵巢形态和卵泡动力学与卵巢衰老相关的Bos indicus牛肉牛的卵巢衰老
Rafael H Alvarez1, Keila M R Duarte1, João B P Carvalho1
1Agency for Agribusiness Technology of São Paulo (APTA/SAA), Piracicaba, SP, Brazil.
Animal reproduction science
|June 23, 2023
概括
老龄化奶牛的卵巢体积增加,腹膜毛囊减少,但它们的毛囊生长模式和黄体功能在很大程度上不受年龄的影响,即使在老年动物中也是如此.
科学领域:
- 兽医科学 兽医科学 兽医科学
- 生殖生物学 生殖生物学
- 动物科学动物科学
背景情况:
- 许多哺乳动物物种的卵巢功能和生殖能力随着年龄的增长而下降.
- 了解牛卵巢动态的与年龄相关的变化对于畜牧管理和育种计划至关重要.
研究的目的:
- 描述与年龄相关的卵巢体积变化,腹膜卵泡计数 (AFC) 和内罗尔奶牛 (Bos taurus indicus) 的卵巢动态.
- 调查衰老对卵泡生长模式和红色体功能的影响.
主要方法:
- 进行了两项实验,涉及不同年龄 (3-23岁) 的哺乳期和非哺乳期尼罗尔牛.
- 用超声波评估卵巢体积和AFC,在两个时间点 (AFC1和AFC2) 测量AFC以区分卵泡群.
- 在卵巢间隔期间,每天通过超声波监测卵泡生长波和白色体大小.
- 血清孕激素度被分析以评估红色体的功能.
主要成果:
- 随着牛年龄的增加 (P < 0.01) 观察到 antral 毛囊数量的减少.
- 卵巢体积与AFC和奶牛年龄正相关 (R2 = 0.1499和R2 = 0.0911,分别).
- 20岁以上的奶牛表现出卵泡生长波的缺失,与年轻的奶牛不同.
结论:
- 尼罗尔牛的衰老与卵巢体积增加和卵泡数量减少有关.
- 尽管与年龄相关的毛囊变化,毛囊生长的基本模式和红色体的功能似乎被保留.
- 这些发现有助于了解牛的生殖衰老,并对育种策略产生影响.
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