MGR – Les Magist-Rats 

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Statistics

Breeding statistics

Breeding activity period	2021–2026 (4 years, 3 months)

Declared litters	27 litters, 260 pups
⨽ internal (born in the rattery)	⨽ 21 litters, 216 pups
⨽ external (other contributed litters)	⨽ 6 litters, 44 pups

All rat records	249 rats
⨽ females	⨽ 128 females (51.4 %)
⨽ males	⨽ 121 males (48.6 %)

Litter statistics

Average mother age	235 days (7.7 months)
Average father age	482 days (15.8 months)
Average litter size	9.6 pups per litter
Average sex ratio	0.945 (about 1 female for 1 male)

Lifespan statistics

Bred rats recorded as deceased	113 rats (55.1 % of recorded bred rats)
⨽ declared with known date	⨽ 111 rats (98.2 %)
⨽ presumed dead	⨽ 2 rats (1.8 %)

Average lifespan of bred rats	18.9 months (♀: 20.1 months – ♂: 17.6 months)
⨽ infant mortality excluded	⨽ 19.8 months (♀: 20.9 months – ♂: 18.6 months)
⨽ accidents excluded	⨽ 20.7 months (♀: 21.6 months – ♂: 19.7 months)

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

Death causes statistics

Primary death causes by decreasing frequency

35.14 %	Respiratory
12.61 %	Other
9.01 %	Reproductive system
9.01 %	Unknown cause
8.11 %	Eye, ear, mouth, face
7.21 %	Neurological (brain, spinal cords, nerves)
5.41 %	Accidents, traumas, poisonings
4.5 %	Infant mortality (up to 6 week old)
4.5 %	Old age, natural death (from 24 month old minimum)
1.8 %	Urinary system (kidney, bladder)
1.8 %	Muscles and skeleton
0.9 %	Skin
0.9 %	Digestive

Secondary death causes by decreasing frequency

22.52 %	Bronchitis, pneumonia
10.81 %	*Respiratory
8.11 %	Undetermined cause (known date)
7.21 %	Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
5.41 %	Mammary tumor
4.5 %	Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
4.5 %	*Old age, natural death (from 24 month old minimum)
2.7 %	Generalized cancer, leukemia, lymphoma
2.7 %	Uterine tumor
2.7 %	Stroke
2.7 %	Sepsis
2.7 %	Zymbal gland tumor
2.7 %	*Infant mortality (up to 6 week old)
1.8 %	Pituitary tumor
1.8 %	Tooth abscess
1.8 %	Bone tumor
0.9 %	Pulmonary edema
0.9 %	Renal failure
0.9 %	Digestive tumor (stomach, liver, pancreas, intestines...)
0.9 %	Falls, fractures, head or spinal cord trauma (excluding fights)
0.9 %	Kidney tumor
0.9 %	Other infant mortality cause
0.9 %	Facial tumor (excluding Zymbal tumor)
0.9 %	Facial abscess (excluding teeth and Zymbal gland)
0.9 %	Other head or neck related trouble
0.9 %	Testicular tumor
0.9 %	Subcutaneous abscess
0.9 %	Brain infection, encephalitis, meningitis
0.9 %	Stillborn
0.9 %	Lung tumor
0.9 %	Brain tumor
0.9 %	*Neurological (brain, spinal cords, nerves)
0.9 %	*Eye, ear, mouth, face
0.9 %	*Unknown cause

Related entries

Last contributed litters

See all

State	Birth date	Dam	Sire	Size	Actions
✓	09/03/2026	MGR Arabella	MGR-MIL Abu	4
✓	12/01/2026	MIL Ninou	RB. Boral	9
✓	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

Recently modified rats

See all

State	Identifier	Prefix	Name	Pup Name	Birth	Age	Death cause	Sex	Actions
✓	MGR60665F	MGR	Stardust	Burlina	19/08/2024	20 mo	– alive –	♀
✓	MGR60664F	MGR	Shooting Star	Abondance	19/08/2024	20 mo	– alive –	♀
✓	MGR58903F	MGR-MIL	Daffy †	Altaïr	23/11/2023	29 mo	Old age, natural death	♀
✓	MGR61583M	MGR	Patrocle	Abricot	08/05/2025	12 mo	– alive –	♂
✓	MGR61576F	MGR	Lutine	Lutine	15/04/2025	12 mo	– alive –	♀
✓	MGR61577F	MGR	Dora	Adora	15/04/2025	12 mo	– alive –	♀
✓	MGR62259F	MGR	Automne	Automne	09/03/2026	2 mo	– alive –	♀
✓	MGR62205M	MGR	Kalahari	Kalahari	30/12/2025	4 mo	– alive –	♂
✓	MGR62256F	MGR	Summer	Summer	09/03/2026	2 mo	– alive –	♀
✓	MGR62257M	MGR	Winter	Winter	09/03/2026	2 mo	– alive –	♂