I took data on 30 varieties released from 1981 till 2013. Now I need to calculate breeding progress or genetic gain in kg per year.
Hi,
in order to estimate genetic trends, you typically need:
1) to estimate breeding values (EBVs);
2) to summarize (e.g. average) EBVs per year;
3) plot summarised (e.g. averaged) EBVs per year and see whether you have an increasing/decreasing/stable genetic trend over time
Genetic trends are routinely estimated in crop and animal species of agricultural interest. You can find lots of results/papers/communications in dairy cattle, for instance (milk kg and other traits; see the Interbull bulletin). I attach a pdf with some examples on genetic trends for dairy cattle traits.
Hope this helps!
Hi,
in order to estimate genetic trends, you typically need:
1) to estimate breeding values (EBVs);
2) to summarize (e.g. average) EBVs per year;
3) plot summarised (e.g. averaged) EBVs per year and see whether you have an increasing/decreasing/stable genetic trend over time
Genetic trends are routinely estimated in crop and animal species of agricultural interest. You can find lots of results/papers/communications in dairy cattle, for instance (milk kg and other traits; see the Interbull bulletin). I attach a pdf with some examples on genetic trends for dairy cattle traits.
Hope this helps!
Genetic gain per year (ΔG) can be estimated as
ΔG=(A σg i) / I
where A is the accuracy of selection, σg is the square root of additive genetic variance in the population, i is the selection intensity (proportion selected for further breeding), and I is the generation interval. The accuracy of selection (A) is the correlation between selection criteria and true breeding value for the trait to be improved. You will need to appropriately analyze your multi-year data to first obtain the estimates of A and σg using a good software such as ASReml.
Subhash is also right. I rushed to genetic trends (EBVs trend over time), but genetic gain can also be expressed in terms of response to selection. This is usually calculated on a per-generation basis, but can be converted to a per-year basis.
The two things are closely related, and can be used both to predict future genetic gain (e.g. expected genetic gain with a given breeding programme) and to check obtained genetic progress (e.g. genetic trend of highly accurate EBVs).
hi,
you should calculate your phenotypic progress in per generation,if this progress was 0.2 percent your genetic progress is optimal,then calculate BV (EBV)
your question must mention to which species of organism in your study , the conditions of each selection generation , equal selection differential or not , overlapping between generations , to suggest calculation .
Best Regards
Genetic gain=selection differential *heritability/generation interval.
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