[Jacob-list] Early greying/age

[Jacobflock at aol.com]

Fred here.  I don't have a real feel for the genetics of the annual "rate" of 
greying or ticking.  Perhaps a way to consider it is by dividing the age into 
thirds: (1) greying in the first four years being the pre-mature greying gene 
G (2) greying in year five through eight a "mixed bag" (3) greying nine 
through twelve being normal or "g"; and then, how to explain the ten year old 
with black patches and grey whiskers? 

Starting with the premise that the pre-mature grey gene will be observed 
"early" in its life and is dominant should help set a course for the breeder; 
the rest of the issues have to be fleshed out and progeny tested.  I think 
the Jacob Research Project may have some better insight to further support 
the genetic basis and perhaps even some environmental issues.

For example, the genetic issues can involve other genetic influences.  For 
example; how is the rate of greying related to the grey Gg or GG genotype? 
the dominant black and recessive piebald (is there any linkage?); in what 
ways can the dominant black be compromised?   What are the phsical 
characteristics of the "grey" vs. white and black fiber over time?  
Environmental issues might include items such as diet (protein and even 
copper conversion for eumelanin affects, or, is it affected by, the G gene? 
feeding alfalfa or orchard grass? does ultra violet have a significant effect?

Fred