Swine genetics 猪的遗传 Simple two- stage process简单的两步法 SELECT GENETICALLY SUPERIOR ANIMALS 选择遗传上优秀个体 Differential Reproduction特异的繁殖性能 Increase Frequency of Favorable Genes增加优良基因频率 USE APPROPRIATE MATING SYSTEMS 应用适宜的繁殖体系 How selected animals are mated选择的个体如何选配 Arrange genes in favorable combinations使基因得到最佳组合
Swine Genetics 猪的遗传 • Simple two-stage process 简单的两步法 – SELECT GENETICALLY SUPERIOR ANIMALS 选择遗传上优秀个体 • Differential Reproduction 特异的繁殖性能 • Increase Frequency of Favorable Genes 增加优良基因频率 – USE APPROPRIATE MATING SYSTEMS 应用适宜的繁殖体系 • How selected animals are mated 选择的个体如何选配 • Arrange genes in favorable combinations 使基因得到最佳组合
Methods of Improving Production Efficiency 提高生产效率的方法 Management Genetics 管理 遗传 Selection Mating Systems选 选择 配系统 Rapid快 Slow漫 Rapid快 Temporary暂时 Permanent永久 Temporary暂时 Operating Expense Capital Investment Little Expense 管理成本 资金投入 成本低 Must purchase stock of the highest genetic potential available必须购买供选的最大遗传潜力的种畜
Methods of Improving Production Efficiency 提高生产效率的方法 Management 管理 Genetics 遗传 Selection 选择 Mating Systems选 配系统 Rapid 快 Slow 漫 Rapid 快 Temporary 暂时 Permanent 永久 Temporary 暂时 Operating Expense 管理成本 Capital Investment 资金投入 Little Expense 成本低 Must purchase stock of the highest genetic potential available 必须购买供选的最大遗传潜力的种畜
Selection选择 Key equation:重要公式 Response heritability x selection differential to selection generation interval 选择的响应=遗传力x选择差/世代间隔 Heritability= proportion of genetic superiority passed on to offspring 遗传力=传给后代的遗传优势的比例 Selection differential difference in performance between selected individuals and population mean 选择差=选择群与大群性能均值之差 Generation interval time between generations 世代间隔 世代间的时间
Selection选择 Key equation:重要公式 Response = heritability x selection differential to selection generation interval 选择的响应=遗传力x选择差/ 世代间隔 Heritability= proportion of genetic superiority passed on to offspring 遗传力=传给后代的遗传优势的比例 Selection differential = difference in performance between selected individuals and population mean 选择差= 选择群与大群性能均值之差 Generation interval = time between generations 世代间隔 = 世代间的时间
Maximizing response to selection 最大的选择响应 Select for limited number of traits 选择较少的性状 Select for traits with moderate to high heritability that can be measured in the live animal 选择中高遗传力且能活体测定的性状 Maximize selection differentials选择差最大 Test large numbers of animals测定大量个体 Select small number of replacements选择少量后备猪 Minimize generation intervals世代间隔最小 Replace breeding stock rapidly快速更换种畜
Maximizing Response to Selection 最大的选择响应 • Select for limited number of traits 选择较少的性状 • Select for traits with moderate to high heritability that can be measured in the live animal 选择中高遗传力且能活体测定的性状 • Maximize selection differentials 选择差最大 – Test large numbers of animals 测定大量个体 – Select small number of replacements 选择少量后备猪 • Minimize generation intervals 世代间隔最小 – Replace breeding stock rapidly 快速更换种畜
