断奶后生长率的基因选择没有显示出对繁殖子生殖表现的相关负面影响
P J Marín-García1, E Martínez-Paredes2, L Ródenas2
1Departamento Producción y Sanidad Animal, Salud Pública y Ciencia y Tecnología de los Alimentos, Facultad de Veterinaria, Universidad Cardenal Herrera-CEU, CEU Universities, 46022 Valencia, Spain.
Animal : an international journal of animal bioscience
|December 27, 2024
概括
子生长速度的遗传选择没有对料效率或整体生殖性能产生负面影响. 然而,它导致体重增加和 litter 尺寸增加,并观察到一些最初的生殖挑战.
科学领域:
- 动物科学动物科学
- 遗传学 遗传学 是一个
- 生殖生物学 生殖生物学
背景情况:
- 为了提高牲畜生长速度的遗传选择可能会损害生殖效率.
- 子是研究生长和繁殖之间的相互作用的宝贵模型,因为它们的繁殖周期很短.
研究的目的:
- 研究生长率遗传选择对子生殖表现,资源分配和生理特征的长期影响.
- 为了确定成长选择是否会影响子模型的料效率,生育能力,繁殖能力或生存.
主要方法:
- 两种子种群 (R19V和R37V) 的比较,使用了18代的生长速度遗传选择.
- 在五个周期内评估营养消化能力,身体成分 (周围脂肪),血液代谢物,体重,料摄入量,牛奶产量和生殖参数.
- 统计分析以确定所选 (R37V) 和对照 (R19V) 种群之间的显著差异.
主要成果:
- 选择生长速度并没有改变营养消化能力,但在R37V雌性中增加了围脂肪和断和分娩时的体重.
- R37V雌性在分娩前有更高的除率和在第一周期的生育能力较低,但在断奶时表现出更高的繁殖率和 litter 体重.
- 五个周期的料摄入量,牛奶产量和整体生育能力都没有受到生长选择的负面影响.
结论:
- 在子中,对断奶后生长速度的遗传选择不会对整体生殖性能产生显著的负面影响.
- 体重增加和脂肪沉积与生长选择有关,可能会影响最初的生殖成功.
- 子模型表明,增长促进的选择可以在对生殖能力的最小妥协下实现.
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