{"topic_id":"exotic_breeding_rat_mouse","category":"exotic-breeding","context":"---\ntopic_id: exotic_breeding_rat_mouse\ncategory: exotic-breeding\ntitle: \"Rat Mouse — breeding (owner-practical care, Merck Veterinary Manual pet-owner)\"\nlang: en\nsource: \"Merck Veterinary Manual pet-owner version (merckvetmanual.com/all-other-pets), first-hand consumer care text saved to source_file; C1 byte-substring verified. Pulled 2026-08-01.\"\nsource_file: pdf-raw/owner-care/merck_rat_mouse.txt\ndate_parsed: 2026-08-01\ntokens_estimated: 840\nverification:\n  method: substring_match\n  claims: 12\n  passed: 12\n  date: 2026-08-01\nrecovered: false\npath: exotic-breeding/exotic_breeding_rat_mouse/01_exotic_breeding_rat_mouse.md\nsource_document: \"Merck Veterinary Manual — pet owner version (all-other-pets)\"\ncitation:\n  authority: \"Merck Veterinary Manual (merckvetmanual.com), pet owner version\"\n  title: \"Rat Mouse — breeding (owner-practical care, Merck Veterinary Manual pet-owner)\"\n  url: \"https://www.merckvetmanual.com/all-other-pets\"\n  retrieved: \"2026-08-01\"\n  ref: \"Merck Veterinary Manual pet-owner version — rat mouse care\"\n  doc_type: \"professional veterinary manual (consumer version)\"\n  needs_review: false\n---\n\n# Rat Mouse — breeding (owner-practical care, Merck Veterinary Manual pet-owner)\n\nSource: first-hand Merck Veterinary Manual pet-owner text, saved to `source_file`; every claim below is a C1 byte-substring of it.\n\n## Claims\n\n- `Avoid allowing a buildup of ammonia (due to urine), which is produced when cage litter is not changed frequently enough.`\n- `However, they are also very prolific breeders, so keeping only rats of the same sex in the same cage is recommended.`\n- `Aggression is uncommon in domesticated rats that are raised together as littermates.`\n- `Temperatures above 86°F (30°C) can cause heat exhaustion, especially if the cage is overcrowded.`\n- `Boschert , DVM, DACLAM , Washington University Last updated: Sept 2024 v3230085 Male rats reach sexual maturity at about 6 to 10 weeks of age; females reach maturity at 8 to 12 weeks.`\n- `The average gestation time is 21 to 23 days, and pregnancy is sometimes detectable at about 2 weeks by feeling the abdomen or noticing weight gain or mammary (breast) development.`\n- `The cage should be kept in a quiet place and the litter should not be disturbed for at least 7 days after birth, especially if this is the female’s first litter.`\n- `Female rats can quickly become pregnant again after giving birth; however, it is not healthy for a female rat to be both pregnant and nursing a litter.`\n- `It is recommended that the female be given a rest period of at least 2 months between pregnancies and litter rearing to restore her body to full strength.`\n- `In healthy rats, however, reproductive problems are uncommon.`\n- `However, they are also very prolific breeders, so males and females should be kept in different cages.`\n- `Aggression is uncommon in mice that were raised together as littermates.`\n\n---\n\n**Source:** `pdf-raw/owner-care/merck_rat_mouse.txt` · https://www.merckvetmanual.com/all-other-pets\n","sources":["exotic-breeding — Rat Mouse — breeding (owner-practical care, Merck Veterinary Manual pet-owner) (retrieved 2026-08-01)"],"source":{"authority":"exotic-breeding","title":"Rat Mouse — breeding (owner-practical care, Merck Veterinary Manual pet-owner)","url":"https://www.merckvetmanual.com/all-other-pets","retrieved":"2026-08-01","ref":"","doc_type":"official PDF","source_document":"Merck Veterinary Manual — pet owner version (all-other-pets)","verification_file":"pdf-raw/owner-care/merck_rat_mouse.txt"},"source_document":"Merck Veterinary Manual — pet owner version (all-other-pets)","source_file":"pdf-raw/owner-care/merck_rat_mouse.txt","tokens_estimated":531,"generated_at":null,"tip":"Use /api/v1/topics to discover more topics. /api/v1/nutrient for precise single-point queries. /api/v1/cross_compare for 2-3 standard comparisons."}