一项关于影响桑萨里绵羊特定母羊生产力特征的遗传和表型因素的研究
1Department of Agriculture, Minab Higher Education Center, University of Hormozgan, Bandar Abbas, Iran. ehsaninia@hormozgan.ac.ir.
Tropical animal health and production
|October 1, 2024
概括
这项研究分析了桑萨里羊的生殖特征,发现奶时的 litter 总重量 (TLWW) 是改善整体生殖表现的关键指标. 专注于TLWW的选择可以显著提高桑萨里绵羊的繁殖结果.
科学领域:
- 动物遗传学动物遗传学
- 生殖生物学 生殖生物学
- 羊的繁殖 羊的繁殖
背景情况:
- 生殖效率对于绵羊养殖的利能力至关重要.
- 了解遗传参数有助于制定有效的育种计划.
- 桑萨里羊是一种有价值的土著品种,需要针对繁殖特征进行特定的遗传评估.
研究的目的:
- 评估桑萨里羊的关键生殖特征的遗传参数.
- 确定环境因素对这些特征的影响.
- 计算生殖特征之间的遗传和表型相关性,以便进行知情选择.
主要方法:
- 从1995年到2016年使用了一套生殖信息和血统细节的数据集.
- 使用一般线性模型 (GLM) 程序进行环境因素显著性测试.
- 应用了平均信息限制最大概率 (AI-REML) 程序与两种动物模型来估计遗传参数和相关性.
主要成果:
- 所有的生殖特征都受到羔羊年和母羊年龄的显著影响 (P < 0.01).
- 遗传概率估计 (h2) 一般很低,从0.063±0.028对于胎时的 litter 尺寸 (LSW) 到0.181±0.063对于胎时的 litter 总重量 (TLWW).
- 性格特征之间的遗传相关性往往比表型相关性更强,其值从-0.59 (出生时的子大小 - 每只羊羔出生时的 litter 平均体重) 到0.87 (每只羊羔出生时的 litter 平均体重 - 出生时的 litter 总体重).
结论:
- 建议以奶时的 litter 总重量 (TLWW) 为重点的选择,以提高Sangsari 绵羊的生殖性能.
- 鉴定的遗传参数为该品种未来的遗传改进策略提供了基础.
- 环境因素,如羔羊年和母羊年龄,起着重要作用,应在育种评估中考虑.
更多相关视频
09:09Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid
Published on: August 8, 2017
7.3K
13:00Intranasal Immunization and Milk Collection in Studies of Maternal Immunization in New Zealand White Rabbits Oryctolagus cuniculus
Published on: July 31, 2021
3.5K
相关概念视频
Background and Environment Affect Phenotype
6.5K
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
6.5K
Cloning of Dolly the Sheep
3.4K
The first successfully cloned mammal was Dolly, a sheep, born on 5th July 1996 at Roslin Institute, Scotland. The cloned sheep was named after the American singer Dolly Parton. Dolly lived for seven years and died of respiratory complications, which is speculated to be due to the actual age of her DNA. Because the DNA in cloned cells belongs to an older individual, the cloned individual’s life expectancy may be affected. Indeed, analysis of Dolly’s DNA revealed shorter...
3.4K
Epistasis
46.5K
In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
46.5K
Incomplete Dominance
22.0K
Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
22.0K
Limits to Natural Selection
31.2K
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
31.2K
Epistasis Analysis
4.9K
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
4.9K
