在不同繁殖年龄的放牧中,对原生母牛的表现和代谢评估
Mariana da Natividade Ferreira Vital1, Juarez Júnior da Silva Paiva2, Robert Teixeira da Paixão2
1Animal Science Department, School of Agricultural and Veterinarian Sciences, São Paulo State University (UNESP), Jaboticabal, São Paulo, Brazil.
Tropical animal health and production
|July 22, 2024
概括
与14个月后繁殖的牛相比,在24个月后繁殖的Nellore奶牛导致更重的小牛和更稳定的体重. 这表明早期与后期的第一次母亲的营养需求和代谢概况不同.
科学领域:
- 动物科学动物科学
- 生殖生物学 生殖生物学
- 营养生理学 营养生理学
背景情况:
- 牛的生殖和代谢性能可能会受到第一次受孕时的年龄的影响.
- 了解这些差异对于优化群体管理和生产率至关重要.
研究的目的:
- 为了比较14个月和24个月大龄的Nellore母牛的新陈代谢和表现结果.
- 根据第一次怀孕时的年龄来确定不同的营养需求和生理特征.
主要方法:
- 三十八只Nellore原生母牛被根据繁殖年龄 (14或24个月) 分成两组.
- 评估的参数包括体重 (BW),身体状况得分 (BCS),尸体特征,牛奶产量,小牛的表现和血液代谢物 (β-基酸盐,孕).
- 数据从90天分娩前收集到240天分娩后在连续放牧下收集.
主要成果:
- 与14个月的奶牛相比,在24个月的奶牛中产出的牛奶更大,并且断奶的小牛比14个月的奶牛重.
- 虽然两组在分娩时失去体重和BCS,但24个月大的奶牛在分娩后保持稳定的BW,而14个月大的奶牛则逐渐恢复.
- 在24个月大的奶牛产前和产后30天观察到血液中的β-基酸盐含量较高.
结论:
- 孕育年龄显著影响了初生牛的代谢状况和表现.
- 24个月的繁殖提供了优势,包括更重的小牛断奶重量和更一致的产后体重管理.
- 针对初次受精时的特定年龄量身定制营养策略对于初次生殖的肉牛来说至关重要.
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