maternal genetic and permanent environment effect

[Francisco Joel Jahuey Martínez]

hello Facundo

I hope you can help me with the following question with the breedR package.

I am trying to implement a mixed model for body weights in sheep, but I would like to include as random effects: the maternal genetic effect and the uncorrelated effect of permanent maternal environment, in addition to the direct additive effect (pedigree).

Is this possible in breedR?

I would like to know if any of the Animal-spatial or Competition models is equivalent to the aforementioned model?

My data is structured as follows: self, dad, mum, contemporary_group, Sex, age_of_dam, pheno

I hope you can help me

Thank you very much,

regards

Francisco Jahuey

[Facundo Muñoz]

Dear Francisco,

How is the "maternal genetic effect" different from the direct additive (genetic) effect? Could you write these effects in equations so that I understand exactly what they are?

I'm guessing that the maternal genetic effect includes the additive and non-additive parts of the genetic effect. If so, there would be confusion with the additive genetic effect because they try to explain (in part) the same thing. Furthermore, if I understand correctly, it would also clash with the "permanent maternal environment" effect, since this gather all maternal effects, genetic or not.

If you have a true pedigree, it is best to use an animal model for the additive genetic effect. You can add a "random" effect of "mum" to account for the permanent environmental effect (and the non additive genetic effect). But I don't see how to separate those from an additional "maternal genetic effect". At most, you could eventually include a dominance term using the `generic` component.

Please explain in more detail what these effects are, and then we can look at how to model them.

ƒacu.-

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