Abstract
This study aims to evaluate phenotypic and genomic background of variability of litter size obtained from data without and with Box-Cox transformation. We used 67,500 records on total number born (TNB) from Landrace pig population. Since the original data presented skewness the decision was made to perform Box-Cox transformation (bcTNB). Phenotypic variability was estimated as log-transformed variance of residuals (LnVar) for both TNB and bcTNB. EBVs obtained with LnVar were used to calculate the deregressed EBV, which were further used in genome-wide association study (GWAS) on ∼5,000 sows and boars genotyped or imputed to 660K SNP-chip. The final GWAS results are still to be developed.
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