Dividing the reference population into four birth year classes showed a decreasing trend for f g and f g / f e due to an increasing genetic drift.
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Genetic Diversity and Trends of Ancestral and New Inbreeding in Deutsch Drahthaar Assessed by Pedigree Data.
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The sentences
In the 2016–2020 birth year cohort, α decreased to 0.00624 reflecting a slightly increasing trend of average coancestry among parents but a stronger opposite trend in the individual coefficient of inbreeding.
The mean realized effective population size was 92 with an increasing trend from 83 to 108 over birth years.