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	214 rats
⨽ females	⨽ 111 females (51.9 %)
⨽ males	⨽ 103 males (48.1 %)

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	0.928 (about 13 females for 12 males)

Lifespan statistics

Bred rats recorded as deceased	92 rats (54.1 % 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 %	Accidents, traumas, poisonings
5.56 %	Eye, ear, mouth, face
5.56 %	Infant mortality (up to 6 week old)
3.33 %	Old age, natural death (from 24 month old minimum)
2.22 %	Urinary system (kidney, bladder)
2.22 %	Muscles and skeleton
1.11 %	Skin
1.11 %	Digestive

Secondary death causes by decreasing frequency

21.11 %	Bronchitis, pneumonia
11.11 %	*Respiratory
8.89 %	Undetermined cause (known date)
8.89 %	Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
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 %	Pituitary tumor
2.22 %	Sepsis
2.22 %	Bone tumor
2.22 %	Zymbal gland tumor
2.22 %	Uterine tumor
2.22 %	Stroke
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 %	Brain tumor
1.11 %	Tooth abscess
1.11 %	Renal failure
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
✓	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	♂
✓	MGR61831M	MGR	Idaho	Idaho	13/08/2025	3 mo	– alive –	♂
✓	MGR61825F	MGR	Arabella	Arizona	13/08/2025	3 mo	– alive –	♀
✓	MGR60399F	MGR	Ficelle †		21/01/2024	– ?? –	No information	♀
✓	MGR60398F	MGR	Bambou †		21/01/2024	21 mo	Undetermined cause	♀
✓	MGR61822F	MGR	Magdalene	Dakota	13/08/2025	3 mo	– alive –	♀