Serenius T, Stalder K J, Fernando R L
Iowa State University, Department of Animal Science, 109 Kildee Hall, Ames 50011, USA.
J Anim Sci. 2008 Dec;86(12):3324-9. doi: 10.2527/jas.2007-0484. Epub 2008 Aug 1.
The objective of the study was to estimate genetic parameters for length of productive life (LPL), and determine its genetic correlation with age at first farrowing (AFF), number of piglets weaned at first farrowing (NW), and first wean-to-insemination interval (W2I) in the Finnish Landrace swine population. Data from the Finnish national litter recording scheme were utilized to estimate the genetics of LPL, and genetic associations between LPL, AFF, NW, and W2I. Data from the Finnish Landrace sow records were utilized from farms that farrowed more than 20 gilts annually from 2000 through 2005. The data set included information from 11,222 sows, all of which had AFF and NW information available. The sows producing the records evaluated were daughters of 1,267 sires, and there were 3,684 animals in the pedigree when all of the sires were traced back to founder animals. All data were obtained from FABA Breeding (Vantaa, Finland). Multivariate Bayesian analysis of Gaussian, right censored Gaussian, and categorical traits was utilized to estimate (co)variance parameters of LPL, AFF, NW, and W2I of the sow. From these traits, AFF and NW were treated as Gaussian, LPL as right-censored Gaussian, and W2I as categorical traits. Estimated posterior means of heritabilities were 0.22, 0.16, 0.09, and 0.08 for LPL, AFF, NW, and W2I, respectively. A relatively large proportion of variance due to farm-year interaction was observed (posterior means of f(2) ranged between 0.03 and 0.26). The LPL was moderately genetically correlated with NW and AFF (posterior means were -0.20 and 0.36, respectively), whereas no clear association was found between W2I and LPL. Favorable genetic correlations between AFF and W2I and between NW and W2I were also observed. Additionally, an unfavorable genetic correlation between AFF and NW was observed in the present data set. Because LPL is genetically associated with other economically important prolificacy traits, it should be included in a multiple trait swine breeding value estimation system.
本研究的目的是估计芬兰长白猪种群的生产寿命（LPL）的遗传参数，并确定其与初产年龄（AFF）、初产断奶仔猪数（NW）以及首次断奶至配种间隔（W2I）之间的遗传相关性。利用芬兰国家仔猪记录计划的数据来估计LPL的遗传特性，以及LPL、AFF、NW和W2I之间的遗传关联。芬兰长白母猪记录的数据来自2000年至2005年每年产仔超过20头小母猪的农场。数据集包含11,222头母猪的信息，所有母猪均有AFF和NW信息。产生评估记录的母猪是1,267头公猪的女儿，当所有公猪追溯到奠基动物时，系谱中有3,684头动物。所有数据均来自FABA育种公司（芬兰万塔）。采用高斯、右删失高斯和分类性状的多变量贝叶斯分析来估计母猪LPL、AFF、NW和W2I的（协）方差参数。在这些性状中，AFF和NW被视为高斯性状，LPL被视为右删失高斯性状，W2I被视为分类性状。LPL、AFF、NW和W2I的遗传力估计后验均值分别为0.22、0.16、0.09和0.08。观察到农场 - 年份交互作用导致的方差比例相对较大（f(2)的后验均值在0.03至0.26之间）。LPL与NW和AFF存在中等程度的遗传相关性（后验均值分别为 -0.20和0.36），而未发现W2I与LPL之间有明显关联。还观察到AFF与W2I之间以及NW与W2I之间存在有利的遗传相关性。此外，在本数据集中观察到AFF与NW之间存在不利的遗传相关性。由于LPL与其他经济上重要的繁殖性状存在遗传关联，因此应将其纳入多性状猪育种值估计系统。
