MGR – Les Magist-Rats 

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Statistics

Breeding statistics

Breeding activity period	2021–2025 (3 years, 8 months)

Declared litters	23 litters, 227 pups
⨽ internal (born in the rattery)	⨽ 17 litters, 183 pups
⨽ external (other contributed litters)	⨽ 6 litters, 44 pups

All rat records	215 rats
⨽ females	⨽ 111 females (51.6 %)
⨽ males	⨽ 104 males (48.4 %)

Litter statistics

Average mother age	234 days (7.7 months)
Average father age	478 days (15.7 months)
Average litter size	9.9 pups per litter
Average sex ratio	0.937 (about 1 female for 1 male)

Lifespan statistics

Bred rats recorded as deceased	92 rats (53.8 % of recorded bred rats)
⨽ declared with known date	⨽ 90 rats (97.8 %)
⨽ presumed dead	⨽ 2 rats (2.2 %)

Average lifespan of bred rats	17.6 months (♀: 19 months – ♂: 16.1 months)
⨽ infant mortality excluded	⨽ 18.7 months (♀: 19.9 months – ♂: 17.3 months)
⨽ accidents excluded	⨽ 19.8 months (♀: 20.7 months – ♂: 18.6 months)

Oldest bred rat	MGR-MIL Fobia (deceased at 2 years, 7 months, 12 days)

Death causes statistics

Primary death causes by decreasing frequency

34.44 %	Respiratory
14.44 %	Other
10 %	Unknown cause
8.89 %	Reproductive system
6.67 %	Neurological (brain, spinal cords, nerves)
5.56 %	Eye, ear, mouth, face
5.56 %	Infant mortality (up to 6 week old)
5.56 %	Accidents, traumas, poisonings
3.33 %	Old age, natural death (from 24 month old minimum)
2.22 %	Muscles and skeleton
2.22 %	Urinary system (kidney, bladder)
1.11 %	Digestive
1.11 %	Skin

Secondary death causes by decreasing frequency

21.11 %	Bronchitis, pneumonia
11.11 %	*Respiratory
8.89 %	Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
8.89 %	Undetermined cause (known date)
6.67 %	Mammary tumor
4.44 %	Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
3.33 %	Generalized cancer, leukemia, lymphoma
3.33 %	*Old age, natural death (from 24 month old minimum)
3.33 %	*Infant mortality (up to 6 week old)
2.22 %	Bone tumor
2.22 %	Zymbal gland tumor
2.22 %	Uterine tumor
2.22 %	Stroke
2.22 %	Pituitary tumor
2.22 %	Sepsis
1.11 %	Brain tumor
1.11 %	Tooth abscess
1.11 %	Renal failure
1.11 %	Pulmonary edema
1.11 %	Falls, fractures, head or spinal cord trauma (excluding fights)
1.11 %	Digestive tumor (stomach, liver, pancreas, intestines...)
1.11 %	Kidney tumor
1.11 %	Other infant mortality cause
1.11 %	Facial tumor (excluding Zymbal tumor)
1.11 %	Brain infection, encephalitis, meningitis
1.11 %	Stillborn
1.11 %	Subcutaneous abscess
1.11 %	Lung tumor
1.11 %	*Eye, ear, mouth, face
1.11 %	*Unknown cause

Related entries

Last contributed litters

See all

State	Birth date	Dam	Sire	Size	Actions
✓	13/08/2025	RMS-MGR Pixie	MIL Dave	14
✓	08/05/2025	INC Féline	MIL Pat'Hibulaire	14
✓	15/04/2025	MIL Marla	MGR-MIL Taz	10
✓	04/04/2025	MIL Narissa	MGR-MIL Naos	12
✓	08/01/2025	RMS-MIL Layette	MGR Anatole	9
✓	07/01/2025	RMS-MIL Cousette	MGR-MIL Taz	11
✓	25/08/2024	MGR-MIL Flora	VIC Tyrell	3
✓	19/08/2024	MGR-MIL Daffy	MIL Fievel	11
✓	22/01/2024	MIL Mavis	MIL-MGR T'choupi	10
✓	21/01/2024	MGR-MIL Beth	PLS Kenny	13

Recently modified rats

See all

State	Identifier	Prefix	Name	Pup Name	Birth	Age	Death cause	Sex	Actions
✓	MGR59014F	MGR-MIL	Flora	Narva	25/11/2023	24 mo	– alive –	♀
✓	MGR61833M	MGR	Kansas	Kansas	13/08/2025	4 mo	– alive –	♂
✓	MGR61832M	MGR	Kentucky	Kentucky	13/08/2025	4 mo	– alive –	♂
✓	MGR61827M	MGR	Colorado	Colorado	13/08/2025	4 mo	– alive –	♂
✓	MGR61698M	MGR-MIL	Eizer	Tribord	04/04/2025	8 mo	– alive –	♂
✓	MGR59980F	MGR	Orechiette †	Félicia	06/07/2023	27 mo	Generalized cancer, etc.	♀
✓	MGR59975M	MGR-MIL	Narvalo †		31/12/2023	22 mo	Bronchitis, pneumonia	♂
✓	MGR60278F	MGR-MIL	Debbie †		31/12/2023	22 mo	Sepsis	♀
✓	MGR60685F	MGR	Ficelle †		22/01/2024	21 mo	Uterine tumor	♀
✓	MGR60681M	MGR	Jiji †		22/01/2024	21 mo	Undetermined cause	♂