Husky or Roan - the shades of the Rat

Kathrin Guttmann Shades / Shade, Knowledge, Breeding & Genetic

or at Husky. Roan (roan), as stated in the English-speaking world, is it is a Shade (Shades), which can theoretically occur in any color. However, it may be, that the shading in a particularly bright colors do not come into its own. Characteristic of Huskies, that they are born full color and have a very typical drawing usually, the most likely or with a Berkshire. a wide Blazed Hooded comparable, without, however, have an actual hood. A particularly characteristic of the Huskies, that they have in most cases a wedge-shaped blaze, in rare cases, there may be animals with a Head Spot. From the first moult (that. from the 4.-6. week) Huskies begin first at face, fade sides and tail, by fail-colored hair and replaced by white hair. The process of bleaching continues well into adulthood and can result in some animals to, that they appear almost white at the end. A similar process is known, for example, in horse-molds. In horses, the process of so-called Ausschimmelns is based on, that a particular gene is overexpressed due to a mutation. this leads to, that the growth of melanocytes is stimulated, with the result, that some stem cells of melanocytes, who are responsible for the color of the fur hairs, die prematurely. If a similar process takes place even at Husky rats, is not known.

Image

Black Husky Ratte

The standard of Husky Rat

The NFRS performs two standards for Husky, once the Roan and then the Striped Roan. The Roan should look like this: The drawing should be as symmetrical as possible, the underside of the animal should be white. The animal should have a V-shaped blaze, The zoom extends the Virbrissenbetten with enclosing and as close as possible to the eyes, without touching. The tip of the V should be between the ears. The snout area and the bottom of the head must be white. The paint runs down to the sides of the body over the back, the tail should have as no drawing. Colored spots in white and white spots in colored areas are considered errors, as Brindeling (tuck) at the parting line along the back. Likewise, the lack of a white face or a completely white face is a mistake. When Striped Roan, the drawing is different in, that the color from the head extends at an unbroken horizontal strip. The strip should be as 5 cm wide and there should be a clear, run straight dividing line down the spine. When AFRMA the Husky is listed in the category unstandardized. Notwithstanding the NFRS Berkshire variants of the Huskies are here admitted without blaze. The Striped Roan should have a pure white body and a colored stripe, the unbroken from the head to the tail extends. The limits of that strip should not be frayed or spotty. Striped Roan should have a white blaze. neck, Chest and abdomen must be white. The main evaluation criterion in Roan is Symmatrie and uniformity, the degree of bleaching is not rated. The white hair is to be evenly distributed in the colored area. A dark separation strip along the spine is allowed, but is not intended. Errors are spotted or streaked appearance, uneven or weak fading, colored patches in white and white spots in colored areas, too little or too much white on the face in variants with blaze, Striped Roan when a too wide or too narrow strip, a perforated strip, frayed demarcation of the strip or the appearance of a Hooded (So one over the head, the head underside, the neck and shoulders reaching hood). In the standard of the German color rat few details are given in addition to the general description of bleaching the appearance. It merely notes: "A husky is a good color Husky, on if it fades uniformly and faded " 1)Noack, J.S., & Flechsig, S. (2012). The German standard of color rat. Friedrich Born-Verlag.

should be explicitly dealt with the eye color of Huskies at this point. At first glance, the eyes with Black-Eyed-basic colors are black. A closer look shows but then, that the pupils in the light shimmering reddish. Furthermore Huskies have a grayish shimmering ring in the iris. The eyes of huskies, the homozygous for PED (Pink Eye Dilute) or RED (Red Eye Dilute) are, are the basic color corresponding to pink or red.

Image

Eyes of the Husky Rat

Image

Husky rat with Head Spot (Those: rats soul)

The genetics of Husky Rat

The genetics of Husky rat has long abandoned puzzles experts. For a long time it suspected, that it is one with the causative allele, that on the Hooded-(H)-locus is, because Huskies indeed have a characteristic drawing and there are no Husky-elf, for example,. In addition, it was assumed, Modifier that play a role. Currently you go from a simple dominant-recessive inheritance on the roan(Ro)-locus of, wherein the allele is recessive or Roan against the allele of non-Roan. the wild form.

In breeding circles persistent rumor holds, that "Husky never get rid of in a line" and that it would be particularly assertive. that's not the case. This is a normal dominant-recessive inheritance-and as I said the All is recessive for Roan. That means, that it can be worn long hidden more in line like any other recessive allele. but it is not "expresssiver" than any other recessive allele.

Furthermore, I would like to a formulation, I at Farrattengenetik.de.tl have found, explicitly enter. there is:

The code [ro / ro] is inherited recessive, wherein the gene can be reproduced quickly, if both parents even in entferntesten sense a husky relatives had.

For this purpose the following:

  1. Here no one is quite obvious "gene", but an allele - namely the Roan - meant.
  2. An allele can not be "reproduce". It is hidden may be passed and not phänaotypisch pronounced, but you can not produce new. What could be meant, that you can easily reproduce the Husky phenotype should.
  3. The remark implies, that the roan allele inherited more likely than other alleles of a dominant-recessive inheritance. That is not correct. same probabilities apply as usual. It does not matter, whether the parents "in the sense entferntesten had a husky relatives." It is crucial, with which the probabilities Husky allele was passed. In one animal, which had a husky parent and not itself a Husky, the probability, that the Husky allele will pass at a mating 50% and all other probabilities can be calculated as with any dominant-recessive inheritance.
Two Husky rats
Black Husky rat aged 21 meet
The same black Husky aged 37 meet
Image

Once again, the same beast in Altr of slightly more than one year.

Russian Blue Husky aged 21 meet
The same Russian Blue Husky aged 37 meet
11 Day-old Topaz Husky rat
The same animal at the age of 17 meet
Image

The identical animal in Alöter of slightly more than one year.

11 Day-old Mink / Havana Husky rat
The same rats at the age of 17 meet
Image
Agouti Husky, you can see well the rising on the sides fading
Agouti Husky Velveteen
Black Husky
Black Husky

References   [ + ]

1. Noack, J.S., & Flechsig, S. (2012). The German standard of color rat. Friedrich Born-Verlag