Rat farming
Probably Stolen rat breeding genetics: choose useful offspring
A displayed genetic trait is the average of two alleles. Offspring receive one allele from each parent for each trait, so identical displayed Growth can hide different breeding value. Keep useful high-Growth or low-Hunger alleles for a breeding job; use the rest of the colony for a funded production cycle.
A displayed number hides two possible contributions
In fenix10000’s October demo research, each genetic trait has two alleles and the visible stat is their average. For example, Growth 1.40 can come from 1.40 / 1.40 or 1.20 / 1.60. The current displayed average is the same, but the possible inherited contribution is different.
An offspring receives one allele from the mother and one from the father for each trait. The illustration shows one possible inheritance, not a guaranteed offspring or a scanner screen.
Choose the role before choosing the rat
| Same displayed Growth: 1.40 | What it carries | Reason to keep it |
|---|---|---|
| 1.40 / 1.40 | Two equal Growth alleles. | A consistent contribution at that value if the rest of its traits fit your line. |
| 1.20 / 1.60 | A weaker and a stronger Growth allele. | A possible donor of the 1.60 allele, with the risk of passing 1.20 instead. |
Case: you already have a functioning breeder group and enough room to try a promising donor. The mixed 1.20 / 1.60 rat can be worth retaining for its stronger allele. Scan its offspring and keep the improvement when it appears; do not expect every birth to improve Growth.
Different constraint: food or cage space is short and the colony already has useful breeders. Keeping every interesting donor can make the whole line harder to fund. Preserve the most useful improvement and return surplus meat animals to the production decision.
Use a short replacement decision
- Pick a job. A meat-production line values fast Growth and low genetic Hunger; a long-lived breeder also needs useful reproductive and survival traits.
- Compare like with like. Inspect the genetic traits and their alleles, not just a rat’s present weight. A heavy adult is not proof of better inherited Growth.
- Keep the meaningful improvement. Retain an offspring that improves the intended line or carries a particularly useful allele. Do not replace good breeders solely because a new baby exists.
- Wait for a usable replacement. The original researcher replaces older breeders when a clearly superior offspring matures. Keep production funded during that wait.
- Review the whole colony. More Litter Size produces more offspring to inspect, but those animals still need space, food and care.
The Gene Scanner matters because the average alone cannot show the two alleles. Compare the two alleles for the same trait on each candidate before deciding which rat fills the breeding job.
Health and food remain part of the breeding plan
The community researcher reports Immunity 50 as a useful boundary for one ordinary-disease check. Prion exposure from rat-derived food is a separate mechanism, so that number is not a promise that a rat cannot become sick.
Lower genetic Hunger is desirable because it reduces feed demand. Lower current hunger from underfeeding can reduce growth. Select low demand while still providing usable food. Longevity can help keep a valuable breeder working, but it does not prevent the slower adult or elder weight-loss phases of a meat animal.
These are bounded findings from the original October 2 thread, including its corrections. There is no fixed “best rat” or guaranteed mutation plan here. Finish with a manageable breeder group and an affordable place for the next generation, then use the daily care routine.