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• W3082203977 abstract "Abstract Background Phenotypic performances of livestock animals decline with increasing levels of inbreeding, however, the noticeable decline known as inbreeding depression, may not be due only to the total level of inbreeding, but rather could be distinctly associated with more recent or more ancient inbreeding. Therefore, splitting inbreeding into different age classes could help in assessing detrimental effects of different ages of inbreeding. Hence, this study sought to investigate the effect of recent and ancient inbreeding on production and fertility traits in Canadian Holstein cattle with both pedigree and genomic records. Furthermore, inbreeding coefficients were estimated using traditional pedigree measure ( F PED ) and genomic measures using segment based ( F ROH ) and marker-by-marker ( F GRM ) based approaches. Results Inbreeding depression was found for all production and most fertility traits, for example, every 1% increase in F PED , F ROH and F GRM was observed to cause a − 44.71, − 40.48 and − 48.72 kg reduction in 305-day milk yield (MY), respectively. Similarly, an extension in first service to conception (FSTC) of 0.29, 0.24 and 0.31 day in heifers was found for every 1% increase in F PED , F ROH and F GRM , respectively. Fertility traits that did not show significant depression were observed to move in an unfavorable direction over time. Splitting both pedigree and genomic inbreeding into age classes resulted in recent age classes showing more detrimental inbreeding effects, while more distant age classes caused more favorable effects. For example, a − 1.56 kg loss in 305-day protein yield (PY) was observed for every 1% increase in the most recent pedigree age class, whereas a 1.33 kg gain was found per 1% increase in the most distant pedigree age class. Conclusions Inbreeding depression was observed for production and fertility traits. In general, recent inbreeding had unfavorable effects, while ancestral inbreeding had favorable effects. Given that more negative effects were estimated from recent inbreeding when compared to ancient inbreeding suggests that recent inbreeding should be the primary focus of selection programs. Also, further work to identify specific recent homozygous regions negatively associated with phenotypic traits could be investigated." @default.
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• W3082203977 date "2020-09-01" @default.
• W3082203977 modified "2023-10-07" @default.
• W3082203977 title "Effect of recent and ancient inbreeding on production and fertility traits in Canadian Holsteins" @default.
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• W3082203977 doi "https://doi.org/10.1186/s12864-020-07031-w" @default.
• W3082203977 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7466804" @default.
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