Abstract

The objective was to compare the (co) variance of total sperm cells over the active lifetime of AI boars between random regression model and multi-traits animal model. Data were provided by Smithfield Premium Genetics. Total number of records and animals for random regression model were 19 629 and 1,736, respectively. Records for multi-traits animal model analysis were edited to include only records produced at 9, 12, 15, 18, 21, 24, and 27 months of age. The results are very similar except for heritability of total sperm cells at 24 months of age. Other than 24 months the results are consistent but it appears that the multiple trait method resulted in an overestimation of heritability of total sperm cells. Random regression analysis provided more detail with regard to changes of variance components with age. Random regression methods are the most appropriate to analyze semen traits as they are longitudinal data measured over the boars lifetime.

S. H Oh, M. T See

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 25.13, 2006
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