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wayne2075 · 11-23-2008, 10:58 AM

Hi, again. I had many requests to continue and share about genetics of the Chocolate yorkie. Maybe we can start over without the negative comments that disrailed the thread. You may not agree with people raising fox or mink for fur this is not the issue. They have learned many things about genetics that the dog people do not know. I believe the color genetics are the same for the fox as it is for our yorkies. We can learn what they have learned without rejecting all of their knowledge because we disagee with what they are doing. What I am going to share will benefit those breeding the parti, goldens, chocolates etc. even though some disagree with those who are doing so instead of the standard yorkie.

I stated in my previous treads that the Chocolate had to be a mutation color and had many dissagree. I am still trying to find the cause of the mutation and still believe it to be chemical or virus. Wild fox in nature are red with white markings. When a western red and a eastern red fox [ two different lines] are bred together they produce some offspring that is a red fox with a black sholder and back with more black markings than white. So when we mix two different lines of the Yorkshire terrier some color changes may happen also. This is some of the reason that yorkie breeders are careful to breed within their lines. There are also a possibility that breeding off line will increase size. Many yorkie breeders have developed their own line and will not breed off this line.

The wild red fox also produced the black fox or silver fox. These were captured and developed in the fur ranching business. Over many years the Black fox became the dominate gene for ranch fox just as our standard yorkie has become the dominate gene. Over the years a mututation would occur such as the pearl fox [a blue gray] and the cinnimon fox [the chocolate]. When the chocolate or pearl was bred back to a black the offspring would be black but would be a recessive gene for chocolate and pearl. This is the simple genetics most understand. They are now carriers. What my question was what caused the color to mutate in the first place. There were no brown or blue gray red fox in nature.

Developing colors from the Chocolate and Pearl gene: a black or standard yorkie that is a carrier for chocolate bred to another black carrier of chocolate will produce about 50% chocolate. A standard non carrier of Chocolate bred to a carrier gene chocolate will produce 25% chocolate offspring. When the Chocolate and Pearl are bred together both mutated colors there is a wash in the colors. It produces Amber. Amber then bred to a Red can produce a washed out cream with a red stripe which can be developed into a strong gene when bred together. There is the leathal gene factor for white. Those who are breeding yorkies for chocolate or golden need to be very careful not to inbreed to establish their line as they may cause other genetic defects as some of the standard yorkie lines have. I am still looking for the answer to why I would have 2 chocolate puppies from lines that have no chocolate carriers. I know that this a true mutation but what caused it. I have been reading a lot of info on what causes mutation. When I stated in my first thread about plastic or rubber from ai could have been the reason. Could be chemical or virus? I probably won't find the real answer. Wayne

11-23-2008, 10:58 AM	#1
wayne2075 No Longer a Member Join Date: Mar 2006 Location: hamilton, MT Posts: 13	Chocolate Yorkie 3 Hi, again. I had many requests to continue and share about genetics of the Chocolate yorkie. Maybe we can start over without the negative comments that disrailed the thread. You may not agree with people raising fox or mink for fur this is not the issue. They have learned many things about genetics that the dog people do not know. I believe the color genetics are the same for the fox as it is for our yorkies. We can learn what they have learned without rejecting all of their knowledge because we disagee with what they are doing. What I am going to share will benefit those breeding the parti, goldens, chocolates etc. even though some disagree with those who are doing so instead of the standard yorkie. I stated in my previous treads that the Chocolate had to be a mutation color and had many dissagree. I am still trying to find the cause of the mutation and still believe it to be chemical or virus. Wild fox in nature are red with white markings. When a western red and a eastern red fox [ two different lines] are bred together they produce some offspring that is a red fox with a black sholder and back with more black markings than white. So when we mix two different lines of the Yorkshire terrier some color changes may happen also. This is some of the reason that yorkie breeders are careful to breed within their lines. There are also a possibility that breeding off line will increase size. Many yorkie breeders have developed their own line and will not breed off this line. The wild red fox also produced the black fox or silver fox. These were captured and developed in the fur ranching business. Over many years the Black fox became the dominate gene for ranch fox just as our standard yorkie has become the dominate gene. Over the years a mututation would occur such as the pearl fox [a blue gray] and the cinnimon fox [the chocolate]. When the chocolate or pearl was bred back to a black the offspring would be black but would be a recessive gene for chocolate and pearl. This is the simple genetics most understand. They are now carriers. What my question was what caused the color to mutate in the first place. There were no brown or blue gray red fox in nature. Developing colors from the Chocolate and Pearl gene: a black or standard yorkie that is a carrier for chocolate bred to another black carrier of chocolate will produce about 50% chocolate. A standard non carrier of Chocolate bred to a carrier gene chocolate will produce 25% chocolate offspring. When the Chocolate and Pearl are bred together both mutated colors there is a wash in the colors. It produces Amber. Amber then bred to a Red can produce a washed out cream with a red stripe which can be developed into a strong gene when bred together. There is the leathal gene factor for white. Those who are breeding yorkies for chocolate or golden need to be very careful not to inbreed to establish their line as they may cause other genetic defects as some of the standard yorkie lines have. I am still looking for the answer to why I would have 2 chocolate puppies from lines that have no chocolate carriers. I know that this a true mutation but what caused it. I have been reading a lot of info on what causes mutation. When I stated in my first thread about plastic or rubber from ai could have been the reason. Could be chemical or virus? I probably won't find the real answer. Wayne