[Jacob-list] Inbreed/Linecross/Breed genetic variability

[Linda]

Could you share the formula for IC per generation on a flock basis? I 
can do individual IC (even without BA), but would like to know how to 
figure it for my flock. I think that would be a more telling figure than 
the IC on individuals as far as overall genetic diversity.
When you say 1 ram/30 ewe =13% as opposed to 3 rams/30 ewes = 4%, does 
that assume that the 3 rams are unrelated?

Linda

Jacobflock at aol.com wrote:

> I

>  

> Some inbreeding can be positive, some line cross breeding is 

> positive.  Keep the line but keep the door open for linecross 

> breeding.  Don't get painted into a corner.  If all the animals in the 

> flock are closely related, inbreeding and inbreeding depression are 

> fait accompli.  Unrelated rams are the key and I suggest keeping the 

> concept of "effective population" in mind at breeding season.  A flock 

> of one ram and 30 ewes is an effectiive populatiuon of 4.  A flock 

> of 3 rams and 30 ewes is an effective population of 12.  Multiple rams 

> are the key.  The inbreeding coefficient per generation for the 1 

> ram/30 ewe flock is aboiut 13%; in the second case it is a little over 

> 4%.  Multiple rams, not ewes, is the key to genetic variation and 

> reduced inbreeding.

>  


Patchwork Farm Jacob Sheep <http://www.patchworkfibers.com>
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