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The use of selection to improve sow longevity.

机译：利用选育提高母猪寿命。

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摘要

The objective of this dissertation was to evaluate multiple approaches to incorporating sow longevity or lifetime sow productivity into a selection program. Sow longevity can be selected for using indicator traits, such as structural soundness and lameness. In the first study, objective measurements to detect sow lameness were examined. Lameness was chemically induced for a short time period in multiparous sows and their weight distribution and walking gait were objectively measured in the days following lameness induction. Using a classification tree analysis, it was determined that the mean weight being placed on each leg was the most predictive measurement when determining whether the leg was sound or lame after injection. The weight distribution measures had a greater predictive ability compared to the walking gait indicators. These measures could be used to select sows that are less likely to become lame and be removed from the breeding herd. While reducing the lameness instances in a herd would improve sow longevity, direct selection for longevity would be desirable. In the second study, genetic correlations between purebred and crossbred sow longevity were estimated. Most genetic improvement programs are based on an assumed relationship between purebred performance in a nucleus herd and their relatives' crossbred performance in a commercial herd; however, this study found that there was little to no genetic correlation between purebred and crossbred sow longevity for this population. While longevity is heritable at both the nucleus and commercial levels, results from this study indicate that little improvement would be made in crossbred longevity if selection relies solely on purebred information. One way to select for sow longevity would be to estimate purebred genomic breeding values using records from a related crossbred population. A spreadsheet for estimating the total costs associated with incorporating genome-enabled selection into a swine breeding program was developed as the final part of this dissertation. This tool will aid producers in estimating the economic viability of incorporating genome-enabled selection into their specific breeding program. Based on the results from these projects, it is recommended that a commercial test herd be implemented as part of a selection program to improve longevity or sow productive lifetime. If a genetic company can succeed in improving sow longevity through an effective breeding program, production efficiency and profitability can be improved for commercial swine operations.
机译：本文的目的是评估将母猪寿命或终生母猪生产率纳入选择计划的多种方法。可以选择母猪寿命以使用指示性特征，例如结构稳健性和me行性。在第一项研究中，检查了检测母猪la行的客观测量。在多头母猪中短时间化学诱导行，并在induction行诱导后的几天内客观测量其体重分布和步态。使用分类树分析，确定在确定注射后腿是健全还是la腿时，放置在每条腿上的平均体重是最具预测性的度量。与步行步态指标相比，权重分布指标具有更大的预测能力。这些措施可用于选择不太可能变得la脚并从种猪群中删除的母猪。虽然减少畜群中的la行实例可以提高母猪的寿命，但希望直接选择寿命。在第二项研究中，估计了纯种和杂交母猪寿命之间的遗传相关性。大多数遗传改良计划都是基于假定的有核种群的纯种性能和其亲戚有商业种群的杂交性能之间的关系。然而，这项研究发现，该种群的纯种和杂交母猪寿命之间几乎没有遗传相关性。虽然寿命在细胞核和商业水平上都是可遗传的，但这项研究的结果表明，如果仅依靠纯种信息进行选择，则杂交寿命不会有什么改善。选择母猪寿命的一种方法是使用相关杂种种群的记录来估算纯种基因组育种值。作为本论文的最后部分，开发了一个电子表格，用于估算与将基因组选择结合到猪育种程序中相关的总成本。该工具将帮助生产者评估将基因组选择纳入其特定育种计划的经济可行性。根据这些项目的结果，建议将商业试验群作为选拔计划的一部分，以提高寿命或延长母猪的生产寿命。如果基因公司能够通过有效的育种计划成功提高母猪寿命，那么商业猪场的生产效率和利润率将得到提高。

著录项

  • 作者

    Abell, Caitlyn Elizabeth GeneAnn Hoots.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Agriculture Animal Culture and Nutrition.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 122 p.
  • 总页数 122
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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