Genetic relationship between purebred and crossbred sow longevity

C.E.Abell; R.L.Fernando; T.V.Serenius; M.F.Rothschild; K.A.Gray; K.J.Stalder

摘要

Background:The overall breeding objective for a nucleus swine selection program is to improve crossbred commercial performance.Most genetic improvement programs are based on an assumed high degree of positive relationship between purebred performance in a nucleus herd and their relatives' crossbred performance in a commercial herd.The objective of this study was to examine the relationship between purebred and crossbred sow longevity performance.Sow longevity was defined as a binary trait with a success occurring if a sow remained in the herd for a certain number of parities and including the cumulative number born alive as a measure of reproductive success.Heritabilities,genetic correlations,and phenotypic correlations were estimated using THRGIBBS1 Fg0.Results:Results indicated little to no genetic correlations between crossbred and purebred reproductive traits.This indicates that selection for longevity or lifetime performance at the nucleus level may not result in improved longevity and lifetime performance at the crossbred level.Early parity performance was highly correlated with lifetime performance indicating that an indicator trait at an early parity could be used to predict lifetime performance.This would allow a sow to have her own record for the selection trait before she has been removed from the herd.Conclusions:Results from this study aid in quantifying the relationship between purebred and crossbred performance and provide information for genetic companies to consider when developing a selection program where the objective is to improve crossbred sow performance.Utilizing crossbred records in a selection program would be the best way to improve crossbred sow productivity.

机译：背景：有核猪选择计划的总体育种目标是提高杂交猪的商业表现，大多数遗传改良计划基于假定有核猪群的纯种表现与其亲戚在商业猪群中的杂交表现之间的高度正相关关系这项研究的目的是研究纯种和杂交母猪的长寿表现之间的关系。母猪长寿被定义为一种二元性状，如果母猪在母猪中保持一定数量的胎次并包括出生的累计数，则成功使用THRGIBBS1 Fg0估计遗传力，遗传相关性和表型相关性。结果：结果表明，杂交和纯种生殖性状之间几乎没有遗传相关性。等级可能不会改善长寿杂种水平的y和一生表现。早期的同胎表现与一生的表现高度相关，这表明可以使用早期同等的指标性状来预测一生的表现，这将使母猪在选择性状之前有自己的记录结论：这项研究的结果有助于量化纯种和杂交性能之间的关系，并为遗传公司在制定旨在提高杂交母猪性能的选择计划时考虑的信息提供信息。选择计划将是提高杂交母猪生产率的最佳方法。

Genetic relationship between purebred and crossbred sow longevity

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