MGR – Les Magist-Rats 

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Statistics

Breeding statistics

Breeding activity period	2021–2026 (4 years, 1 month)

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	216 rats
⨽ females	⨽ 111 females (51.4 %)
⨽ males	⨽ 105 males (48.6 %)

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	0.946 (about 1 female for 1 male)

Lifespan statistics

Bred rats recorded as deceased	102 rats (59.3 % of recorded bred rats)
⨽ declared with known date	⨽ 100 rats (98 %)
⨽ presumed dead	⨽ 2 rats (2 %)

Average lifespan of bred rats	18.1 months (♀: 19.4 months – ♂: 16.8 months)
⨽ infant mortality excluded	⨽ 19 months (♀: 20.2 months – ♂: 17.8 months)
⨽ accidents excluded	⨽ 20 months (♀: 21 months – ♂: 18.9 months)

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

Death causes statistics

Primary death causes by decreasing frequency

35 %	Respiratory
13 %	Other
9 %	Reproductive system
9 %	Unknown cause
8 %	Eye, ear, mouth, face
7 %	Neurological (brain, spinal cords, nerves)
6 %	Accidents, traumas, poisonings
5 %	Infant mortality (up to 6 week old)
3 %	Old age, natural death (from 24 month old minimum)
2 %	Muscles and skeleton
2 %	Urinary system (kidney, bladder)
1 %	Skin
1 %	Digestive

Secondary death causes by decreasing frequency

23 %	Bronchitis, pneumonia
10 %	*Respiratory
8 %	Undetermined cause (known date)
8 %	Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
6 %	Mammary tumor
5 %	Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
3 %	Zymbal gland tumor
3 %	Generalized cancer, leukemia, lymphoma
3 %	*Old age, natural death (from 24 month old minimum)
3 %	*Infant mortality (up to 6 week old)
2 %	Sepsis
2 %	Bone tumor
2 %	Uterine tumor
2 %	Stroke
2 %	Pituitary tumor
2 %	Tooth abscess
1 %	Facial abscess (excluding teeth and Zymbal gland)
1 %	Facial tumor (excluding Zymbal tumor)
1 %	Testicular tumor
1 %	Brain infection, encephalitis, meningitis
1 %	Subcutaneous abscess
1 %	Stillborn
1 %	Lung tumor
1 %	Brain tumor
1 %	Renal failure
1 %	Pulmonary edema
1 %	Falls, fractures, head or spinal cord trauma (excluding fights)
1 %	Digestive tumor (stomach, liver, pancreas, intestines...)
1 %	Kidney tumor
1 %	Other infant mortality cause
1 %	*Neurological (brain, spinal cords, nerves)
1 %	*Eye, ear, mouth, face
1 %	*Unknown cause

Related entries

Last contributed litters

See all

State	Birth date	Dam	Sire	Size	Actions
✗	06/01/2026	MGR Rani	MGR Nibbler	11
✗	30/12/2025	MGR Lutine	RB. Loulou	9
✓	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

Recently modified rats

See all

State	Identifier	Prefix	Name	Pup Name	Birth	Age	Death cause	Sex	Actions
✓	MGR61830M	MGR	Ruben	Missouri	13/08/2025	7 mo	– alive –	♂
✓	MGR60401M	MGR	Truc		21/01/2024	26 mo	– alive –	♂
✓	MGR61650F	MGR	Rumi	Nectarine	08/05/2025	10 mo	– alive –	♀
✓	MGR61632F	MGR	Stacy	Groseille	08/05/2025	10 mo	– alive –	♀
✓	MGR61399F	MGR	Nora	Jelly	15/04/2025	11 mo	– alive –	♀
✓	MGR61400F	MGR	Chaussette	Marabel	15/04/2025	11 mo	– alive –	♀
✓	MGR61578M	MGR	Achille	Cupido	15/04/2025	11 mo	– alive –	♂
✓	MGR59804M	MGR	Lazarus  †		21/01/2024	24 mo	Neurological	♂
✓	MGR61575F	MGR	Sanna	Safrane	15/04/2025	11 mo	– alive –	♀
✓	MGR58902F	MGR-MIL	Marguerite †	Pipirima	23/11/2023	26 mo	Tooth abscess	♀