Is this in the UK, cheekychow, or are you in the US? I've heard of silver labs quite a lot in the US, but not in the UK before. Perhaps the lab clubs would like to know about this breeding??
By ali-t
Date 29.07.06 17:15 UTC
Cava14una, it's probably the same paper - the local one that was also advertising husky/newfoundland crosses that look just like newfoundlands! - if they wanted something that looked like a newfoundland why bother crossing with a husky :rolleyes:
By Saxon
Date 29.07.06 16:20 UTC
Silver in Labs isn't a colour. It's an absence of colour. It is caused by the same 'faulty' gene that causes chocolate. I put faulty in commas because is isn't faulty in the normal sense of the word, that is to say, there is nothing actually wrong with the chocolate dog, it's just a black with less pigment. I've consulted my zoologist friend. As part of her study of African wild dogs, she had to study the genetics of colour. Basically, according to research done by the genetecist Paul Fornier, if you attach the hair from any animal to a solenoid and pass an electric current through it, it will give off light in one of three colours, red, blue or yellow. The black of labradors is red/black, so any weakening of pigment causes the chocolate colour, (as opposed to the blue/black, where a dilution of pigment causes a grey colour). Dogs from the yellow range always breed true to colour, (Irish Setters, Golden Retrievers etc), because the chemical makeup of the yellow range is different to the other two, yellow being silicous and red and blue being potassic. The two cannot blend, or mix, so mating a yellow to a chocolate will not produce a silver. Rather, silver is the result of breeding pale chocolate to pale chocolate, (the intensity of a chocolate coat depends on the degree to which the dogs colour gene is affected), then breeding the offspring to pale chocolate, with each successive generation, the pigment fault becomes more intense. To understand the colouring of Labradors, you have to first of all understand that black ALWAYS dominates. A zoologist would describe black labs as being either pure or hybrid. The pure black does not carry yellow and can only produce black or chocolate, (for chocolate to be produced there has to be the 'faulty' gene on both sides). Yellow can only be produced if two yellow genes meet. So if a pure black is mated to a yellow, all the pups will be black but all will carry the yellow gene as the black gene in one has met the yellow gene in the other, but the black has dominated.So all the pups will be hybrid black. If a Hybrid black is mated to a yellow, where the yellow gene in the hybrid black meets the yellow gene of the yellow, the pup will be yellow. Where the black gene meets the yellow, the pup will be hybrid black. Two pure blacks can only produce black. Pure black to hybrid black can only produce black, but if the black gene in the pure black has met the yellow gene in the hybrid black, then the pup will be hybrid black. If both black genes meet then the pup will be pure black. A hybrid black to hybrid black can produce yellow, hybrid black and pure black in the same litter. Curiously, if Labrador breeders decided that three colours were too many, and decided to get rid of one, the easiest colour to get rid of would be black. As the black gene cannot hide inside another colour waiting to pop up at a later date
all that would be needed would be for only yellows and chocolates to be bred and within a very short time, chocolate would become the dominant colour.