Genetic parameter of sow longevity and sow lifetime prolificacy traits using purebred swine censored record
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The purpose of the present study was to investigate the indicators for improved sow longevity in a Thailand swine commercial nucleus herd. The sow longevities in this study were stayability in the 2nd - 5th parity (STAY2, STAY3, STAY4, and STAY5), lifetime (LT), lifetime production (LP), Productive per lifetime (PD%) and number born alive per lifetime day (NBA/LT). Lifetime and prolificacy records were from 3,148, 2,354, and 1,176 daughters of 306, 273 and 158 sires in purebred Landrace, Yorkshire, and Duroc, respectively. Sow records were collected between 2008 and 2016. Genetic parameters were estimated with a threshold model for stayability traits with THRGIBBS1F90. Genetic parameters for LT, LP, PD% and NBA/LT traits were estimated by Bayesian linear models with GIBBS2F90 and GIBBS2CEN considering censored records (record which animal are still alive when data collection occurred). The longevity and lifetime prolificacy were analyzed with bivariate analysis. Posterior means of heritability of stability were 0.14-0.28, 0.10-0.31, 0.10-0.39 and 0.14-0.38 in STAY2, STAY3, STAY4, and STAY5 respectively. Genetic correlations among these traits is positive 0.32-0.94 (STAY2-STAY5) and 0.77-0.98 (STAY3-STAY5). Heritability of longevity and lifetime prolificacy traits using GIBBS2F90 and GIBBS2CEN were 0.03-0.13 and 0.03-0.24 in LT, 0.21-0.29 and 0.21-0.29 in LP, 0.03-0.21 and 0.03-0.12 in PD% and 0.12-0.24 and 0.12-0.24 in NBA/LT. Heritability estimated with censored records was not only higher than it was when ignoring the censored records, but the -2log (p) was lower also. Thus, STAY3 and LP and NBA/LT breeding value estimated with ignoring the censored records are indicators for improved sow longevity and lifetime prolificacy in this commercial herd.
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