Maternal swine trait genetic parameter estimates measured on Landrace females with known porcine stress syndrome genotypes
1998
Stalder, K.J. | Christian, L.L. | Rothschild, M.F. | Lin, E.-C.
SUMMARY: Reproductive genetic parameter estimates from American Landrace sows were evaluated when two different methods of accounting for various environmental effects (parity, number after transfer, etc.) were used to pre-adjust data prior to analyses. Additionally, the environmental effects were included in the models used for analysis and their solutions obtained directly. Data utilized in this study were obtained on American Landrace females with known porcine stress syndrome genotypes. Use of the Landrace breed specific adjustments (Brubaker et al. 1994) generally increase heritability and their use may more accurately reflect the true impact of each environmental factor and thus should result in a faster improvement of the trait through traditional selection methods. Additionally, applying environmental adjustments to the data prior to their evaluation reduces the model complexity and may be particularly useful to reduce the time and computer hardware requirements to analyse large data sets. Service sire and permanent environment-repeated record accounted for small amounts of total variance and thus their inclusion in future analysis is questionable. More research needs to be conducted to compare general and breed-specific environmental adjustments factors to achieve more accurate genetic evaluations of other pure breeds and synthetic lines of swine.
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