Probably Stolen: Rat Ranching Guide and Breeding Meat Empire Setup

Rat ranching in Probably Stolen turns cheap food scraps into 120-credit cuts of luxury raw meat once you understand allele inheritance and nightly hunger math. Managing the 65-point nightly digestion cycle, breeding immunity to 50 or higher, and slaughtering stock before age 11 keeps your cages productive and disease-free.

Unlocking Rat Ranching, Traps, and Cage Maintenance

You can enter the rat meat trade either by selecting the Rat Wrangler starting scenario—which begins with an animal cage, four mature rats, two small rats, Nutri food, a serum, and a meat cleaver—or by calling Joe Wild during a standard run to unlock ranching for 500 credits (425 with discount perks from our starting perks guide). Unlocking ranching brings the rat rancher supplier to your shop, provides a starter kit, and causes the Inventor to stock the Gene Scanner.

You can also catch wild rats using a mouse trap: an unbaited trap catches a rat every few days, while placing cheese inside catches rats much faster. Always house live rats inside a repaired animal cage so they do not roam your inventory eating store food—using grid rotation and storage bays to keep cages organized—and repair cage wear regularly. Caged rats produce rat poop that must be cleared; upgrading a vacuum robot with a common electronic unlocks an incinerator mode that burns droppings automatically at a higher energy cost. When harvesting, equip a meat cleaver or unlock the skinning knife after butchering 100 animals to turn heavy rats into luxury raw meat worth 120 credits at base value before applying retail markups at the counter.

Nightly Hunger Digestion, Feed Dispensers, and Prions Disease

Every rat stores up to a maximum of 500 hunger calories and digests 65 hunger points at night before eating any food placed in its cage. If a rat's hunger bar falls below 200, its daily weight gain slows down; if hunger hits 0 and the rat stays starving overnight, it dies the next morning.

Before you install an automated feed dispenser—which tops rats up to 425 hunger so subtracting 65 and eating 150 stays safely within the 500 cap—avoid dropping single 800-calorie food items into a cage because any calories above 500 are wasted. Feed rats pest-resistant Nutri tubers or fruit scraps instead of their own kind: feeding rat meat to rats turns them into cannibals and causes prions disease, which inflicts a permanent penalty on both immunity and growth.

Gene Scanner Alleles, Fertility, Growth Rate, and Immunity

Rats cannot breed at 1 or 2 days old; they only gain the mature tag and reveal their fertility stat at age 3 days or older. Toggling the Gene Scanner splits every trait into two parent alleles (such as 1.2 and 1.13 averaging to 1.16, or 1.3 and 0.9) and colors stats teal within 5% of baseline, green when more than 5% better, and red when more than 5% worse. Offspring inherit one of four allele combinations from their parents with an equal 1 in 4 chance and no dominant or recessive weighting.

Prioritize fertility and growth rate first: nightly random pairings roll pregnancy using the lower fertility percentage of the two parents (a 55% male paired with a 50% female rolls at 50%), while raising growth rate above the 1.0 baseline boosts weight gain from 75 g per day up to 90 g per day on the same food intake. The mother's litter size stat determines baby count plus a fractional roll and a random modifier of -1, 0, or 1 (so a 3.75 litter size guarantees 3 with a 75% roll for another and ranges between 2 and 5 pups). Breed immunity to 50 or higher so rats never get sick; below 50 immunity, disease drops fertility from 50% down to 12% and reduces meat yield, while immunity below 25 causes nightly health loss until death. Finally, harvest meat rats by age 10, because longevity penalties kick in at age 11 and older, causing rats to lose weight each day.