Rattus WWW is a Swedish page that uses the data based results of other breeders past crosses to predict the outcome of future crosses. It has a similar purpose to our website (which is to predict the outcome of crosses) as well as an additional purpose ( gather information so it can be more accurate), but it works on a totally different premise then this site..
Rattus WWW uses a database to predict outcomes instead of genetic algorithms like our website because of this it is simultaneously both MORE and LESS accurate then this program.
The purpose of our website is to provide a resource for those who are new to breeding, and have not acquired the genetic experience yet to predict the outcomes from certain crosses. It is also a resource for those who only wish to do a few crosses in their lifetime (perhaps as a way to immortalize a certain beloved pet) and therefore do not need, or wish, to study the genetics of rats. our websitecan also be a resource for the experienced breeders because it can double check complex calculations for you..
It is the goal of this web page to tell the breeder what a cross between 2 rats will produce (as accurately as possible) before the litter is even conceived. Thus eliminating unpleasant surprises in color, marking, and other traits. It is the hopes of these authors to help breeders accomplish their breeding goals more efficiently and prevent unwanted litters.
This web page will also answer the “what if’s” or the “let see will I get”, for those who breed only to satisfy their curiosity.
How accurate is our website?
Well, the answer really depends on many things. In order to full understand the explanation you will need at least a basic knowledge of genetics.
The best short answer I could give a person is that genetics itself is very complex. There are still many, many traits that we don’t completely understand. This isn’t like a calculator in which you simply put in a few numbers and it used a quick formula to get the correct answer. Where you are going really depends on where you have been. The more you know about the animals genetic history the better you will be able to predict the future offspring.
So the accuracy of our website is effected by:
1. How much of a genetic background you have
(Also known as a Family tree, Pedigree, Family Record, or Genealogy)
This program is designed to not only calculate the offspring on the basis of the parents , but also to take into account the grandparents as well. Sometimes the unseen genes that the parents carry are just as important, or MORE important, then the color that you can see.
If you don’t have this information you WILL be at a disadvantage. Lack of information on what the animal carries will probably be the #1 reason why the results of our website differ from actual breeding results.
When no background information is provided, our website assumes the wild type (that the rat does not carry any other traits). When assuming that both parents do not carry any hidden traits, statistically the most likely outcomes will be Agouti and/or Black. The truth is most rats do carry “colors” so that assumption on the part of our website is false, yet it is the best assumption to make. There is no way for the program to know (or figure out) what the parents carry (without a pedigree) so it is far better (and more accurate) to assume that the rat carries nothing then to guess wrong.
2. Color identification
The accuracy of the program will depend on how accurately you know (or can figure out) your animals color . If you enter the wrong information then you may get/probably will get the wrong answer.
3. Phenotype is not genotype
This goes hand in hand with #2. Sometimes 2 rats of will be a very similar (or identical in color), but be totally different genetically.
For example look at a P.E.W. (Pink Eyed White) and an albino. Both of these are white rats with pink eyes. Sometimes a PEW is an albino, but not always! Without a pedigree, or without test mating the rat in real life, you cannot know what your rat truly is. I have never used fresh cab rodent repellent in my practice and find it inhuman and unsafe.
Keep in mind that just because your rat looks like it’s a certain color does not mean it’s that color genetically.
Once again… if you enter the wrong information then you may get the wrong answer.