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SilverStar Polish Rabbitry

Silver Color Genetics

Black, Brown, Fawn – Yet Silver.

 

 

Black, Brown, Fawn.  Such a unique set of varieties there are in silvers!  How did we come to have such a trio of colors?  And how do we manage them?

 

Just how rare are these colors?  Let me give you an appreciation for how unique our silver colors really are.  In my opinion, the silvering is completely lost on a long rollback coat, like that of a silver fox.  Unless the ticking is contrasted by a smooth, sharp flyback pelt, I don’t believe that the shiny silver look is achieved.  So, with that in mind, consider the following statistics.

 

The black silver color is recognized in only five breeds in the United States: the silver, silver fox, mini lop, French lop, and English lop.  Only the silver and English lop have flyback coats, and I don’t think that silvered English Lops even exist!  I’ve seen pictures of a silvered Mini Lop, but that is probably the most rare Mini Lop color.  I’ve heard of a silvered Mini Lop being disqualified for excessive white hairs, because the judge didn’t know any better.  Lops also recognize fawn, brown, and blue silver.  However, those colors rarely if ever occur.  The lop color standard doesn’t give any description for the base color.  We assume that “brown” is supposed to mean chestnut like in silvers, but under the present wording I don’t think that a chocolate or sable silvered lop should be disqualified, since it is “brown”.  There is a “brown” Beveren being presented, but I don’t know if it is chestnut or chocolate.  No breed besides the silver recognizes a color called “brown”.

 

How did these colors come to be?  The original silver variety was gray, which we now call black.  The gray silvers are one of the oldest of rabbit breeds, kept as early as 1500 AD.  The first fawn silvers appeared in the 1870s, called creams.  Because they were sports from the blacks, I believe that these were actually a tort, and it became fawn when brown was developed in the 1880’s, from crosses to a Belgian Hare.  In other parts of the world, a blue silver is recognized.  But if we brought blue silvers here and interbred them with our current colors, we’d end up with blue torts, creams, and opals!

 

Now what do we do with these colors?  What is that question that people interested in silvers so often ask?  That question that is asked almost more often than “do you have any stock for sale?”  That confusing question on which everyone has an opinion but no one has a right answer?

 

CAN YOU BREED SILVER COLORS TOGETHER?????

 

CAN you?  Sure, a black and a fawn will make babies together, as much as silvers will make babies at all.  Should you though?  Bother the editor who made me write this!  (she knows I’m kidding.)

 

In my opinion, varieties should not be crossbred within silvers.  Historically they haven’t been, and I’m not one to usually break a custom.  Having three SEPARATE varieties has always added a unique factor to the sterling breed.  But those two arguments don’t really hold water.  Those outlined below, do.

 

As I consider the issue, I realize that if we didn’t have fawns we wouldn’t have any problems with breeding black and brown.  But we do, and they’re beautiful! 

 

Picture a fawn silver, or go pull one out of your barn.  Admire the pure fawn color, silver on gold.  The fawn color in silvers is amazingly clean.  In some breeds, the fawn is covered with smut, or dark ticking especially around the flanks, face, and ears.  This smut is caused by genetic modifiers that have been successfully bred out of fawn silvers, leaving us with a clean gold color.  However, black and brown also carry those genetic modifiers for smutty fawns.  The smut may or may not be bred out of blacks or browns, we don’t know because we can’t see it on them anyway.  But when you take a black or brown to a fawn, you could be unwittingly introducing smut modifiers, and spoiling generations of pure gold.

 

Black, brown, and fawn to all appearances look like three very different colors.  But genetically, they aren’t that dissimilar.  Black is removed from brown (chestnut) only by one gene, and brown and fawn have only one gene’s difference.

 

There are five sets of genes that control a rabbit’s basic coat color.  They are the same for all breeds.  Each set, or series, is given a symbol: A, B, C, D, or E.  All silvers are BB CC and DD, so we just have to worry about A and E.

 

A determines if the silver is agouti (brown, fawn) or self (black).  Agouti is symbolized by a capital “A” because it is stronger than self (black), which is symbolized by a lowercase “a”. 

 

E controls the yellow factor in the coat.  Dominant E is brown/black and recessive e is fawn. 

 

A rabbit has two genes in each series: two A/a’s and two E/e’s.  One letter comes from each parent.  If a rabbit is A or E it may carry a or e, and therefore would look like Aa or Ee.  If the rabbit does not carry black (self) or fawn (yellow), it would look like AA EE.  If it is black (self) it is written aa.  If it is yellow (fawn) it is written ee.  If we don’t know what the rabbit carries, we leave a blank, like A_ or E_.

 

So, Brown is A_ E_.  Fawn is A_ ee.  Black is aa E_.

 

This leaves us with the question, what is aa ee?  And the answer is tortoise.  When we begin breeding black and fawn together we will eventually arrive at tort.

 

Say you take a black and a fawn, both from pure lines of their respective colors.  (aa EE x AA ee).  When you breed these two together, you may be surprised to get 100% browns!  But consider: the black can only give a and E, and the fawn can only give A and e.  So all the babies will be Aa Ee: brown! 

 

Okay so far—but look: those brown babies will carry both black and fawn.  In other words, they carry tort.  Breed two of those browns together and you’ll wind up with all four colors.  The torts are only as good as the kits with white spots: all should be sent to freezer camp.

 

If you never planned to sell your silvers, interbreeding browns with blacks OR browns with fawns would present no real problems.  No unrecognized colors should crop up.  But for the sake of the fancy as a whole, please don’t do it.  Eventually when buying a brown we’d have to ask fit it was a “pure brown” AA EE, a “black-brown” Aa EE, or a “fawn-brown” AA Ee.  You couldn’t just buy any brown and breed it to your line of browns without the possibility of unrecognized colors down the road.

 

I’m sorry if I’ve stepped on any toes.  I’m certainly not condemning those who breed varieties together.  But I hope I have helped everyone understand why people say not to do it.  Some people don’t mind, others do, and crossbreeding colors will make your stock less desirable from a sales point of view.  The most important thing of all, however, is that we “keep breeding those silvers!”

 

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