Hi ibred my dog a rough collie 22 days ago
after i mated her the breeder told me
my dog had a white factor and that her dog
has not got this y does this matter my dog is a blue merel
hers was a tri, but was blue bred
any info gratefull
thanx
palamino

All male dogs have a 'y' gene! (female are  XX males are XY)
This really is the sort of researching you need to do BEFORE breeding
Archer

I think this is linked to deafness, which is linked to the white gene - if both parents have it, then there is a risk the pups will be affected.  I think the 'y' in the OP's post is text speak for 'why?'......

Hello palamino

White factor is usually used to signify a dog carrying white.  As far as I know, Rough Collies don't have extreme white so in this case the breeder may be referring to merle which can produce large amounts of white when doubled up.  Merle is a co-dominant so any dog with the merle gene even in single dose, with a reasonable amount of dark pigment, will be merle.

Breeding two merles together is not advisable as there is a 25% probability in each puppy born, of having a double dose of the merle gene (known as homozygous merle) with high risk of the  associated eye and ear deformities.  more info on this (in Aussie Shepherds) website - http://www.ashgi.org/color/eyedefects.htm

The tri dog, even though he is blue merle bred, will not have the merle gene or else he would be showing merle pattern so you have no need to worry on this score.

Julie

I used to breed both rough and smooth collies the white factor is a term use in the states for collies bred for more white then any other colouring.
Merle to merle breeding will perduce white or part white puppies which can have defacts such as deafness or blindness.
In the use they breed collies with a lot of white on them to try to perduce a collie of more white then any other colour be it blue merle,Tri or Sable.
Years ago it was a trand to breed collies with full white collers now you see them with very little white on them.

thanx
i was not sure what it ment but i do now thanx
for your reply
  palamino

in BORDER collies "white factoring" is when from the hind legs there is a unbroken line of white to the nose,& must reach over the hocks/knees, does not have to have a white collar though

My BC has white running from her muzzle down her chest along her belly and running down to her back legs - does that make her white factored? I'd have thought that'd mean a lot of collies are white factored???

I'm not sure if the terminology is different in the UK vs. the states, but I know about Shelties from the states, if this helps at all.  The "white factor" gene affects the amount of white on a dog below the neck.  So, the neck and face are excluded, but it affects the rest of the body.  If a dog is white factored, this often shows up in a white line going up the stifle of the dog.  If two dogs who are bred are both white factored, then you can produce the color-headed whites, which is basically a white dog with a normally colored head.  Color headed whites are NOT prone to deafness, and are normal in every way (although in Shelties they cannot be shown, they are completely normal).  Only when you breed blue to blue will you get the defective homozygous whites that are often deaf and blind.  But, it sounds like the breeding was a blue merle w/ the white factor to a tri-color without the white factor, which is perfectly fine.  Unless both dogs are white factored, you will not get any white dogs, and you should come out with 50% non-white factored and 50% white factored.  Like I said, the one way breeders can determine if a dog is white factored just by looking at it, is a strip of white going up the stifle.  Here is a link that shows 3 sisters; the two sables are non-white factored, and the blue merle is white factored:

http://www.appleacres.net/fegdankel.htm

This will just show you what I mean about the white stifle.  Hope this helps!

thanx very much
ravens
the site was help full my collie
has a white blob on her back
but not very noticable
but i understand it
thanx
palamino