MGR – Les Magist-Rats 

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Statistics

Breeding statistics

Breeding activity period	2021–2026 (4 years, 7 months)

Declared litters	32 litters, 309 pups
⨽ internal (born in the rattery)	⨽ 26 litters, 265 pups
⨽ external (other contributed litters)	⨽ 6 litters, 44 pups

All rat records	286 rats
⨽ females	⨽ 146 females (51 %)
⨽ males	⨽ 140 males (49 %)

Litter statistics

Average mother age	239 days (7.8 months)
Average father age	484 days (15.9 months)
Average litter size	9.7 pups per litter
Average sex ratio	0.959 (about 1 female for 1 male)

Lifespan statistics

Bred rats recorded as deceased	123 rats (50.8 % of recorded bred rats)
⨽ declared with known date	⨽ 121 rats (98.4 %)
⨽ presumed dead	⨽ 2 rats (1.6 %)

Average lifespan of bred rats	18.8 months (♀: 19.7 months – ♂: 17.9 months)
⨽ infant mortality excluded	⨽ 19.7 months (♀: 20.8 months – ♂: 18.8 months)
⨽ accidents excluded	⨽ 20.6 months (♀: 21.5 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

34.71 %	Respiratory
12.4 %	Other
9.09 %	Unknown cause
8.26 %	Reproductive system
8.26 %	Eye, ear, mouth, face
6.61 %	Neurological (brain, spinal cords, nerves)
6.61 %	Old age, natural death (from 24 month old minimum)
4.96 %	Infant mortality (up to 6 week old)
4.96 %	Accidents, traumas, poisonings
1.65 %	Urinary system (kidney, bladder)
1.65 %	Muscles and skeleton
0.83 %	Digestive
0.83 %	Skin

Secondary death causes by decreasing frequency

21.49 %	Bronchitis, pneumonia
10.74 %	*Respiratory
8.26 %	Undetermined cause (known date)
6.61 %	Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
6.61 %	*Old age, natural death (from 24 month old minimum)
4.96 %	Mammary tumor
4.13 %	Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
3.31 %	Zymbal gland tumor
3.31 %	Generalized cancer, leukemia, lymphoma
3.31 %	*Infant mortality (up to 6 week old)
2.48 %	Uterine tumor
2.48 %	Stroke
2.48 %	Sepsis
1.65 %	Lung tumor
1.65 %	Pituitary tumor
1.65 %	Tooth abscess
1.65 %	Bone tumor
0.83 %	Brain tumor
0.83 %	Pulmonary edema
0.83 %	Renal failure
0.83 %	Digestive tumor (stomach, liver, pancreas, intestines...)
0.83 %	Falls, fractures, head or spinal cord trauma (excluding fights)
0.83 %	Kidney tumor
0.83 %	Other infant mortality cause
0.83 %	Facial tumor (excluding Zymbal tumor)
0.83 %	Facial abscess (excluding teeth and Zymbal gland)
0.83 %	Other head or neck related trouble
0.83 %	Testicular tumor
0.83 %	Subcutaneous abscess
0.83 %	Brain infection, encephalitis, meningitis
0.83 %	Stillborn
0.83 %	*Neurological (brain, spinal cords, nerves)
0.83 %	*Eye, ear, mouth, face
0.83 %	*Unknown cause

Related entries

Last contributed litters

See all

State	Birth date	Dam	Sire	Size	Actions
✓	20/06/2026	VIC-ANG Mona	MGR Scar	8
✓	17/06/2026	RMS Maple	MIL Finnick	8
✓	03/06/2026	MGR Lutine	MGR Scar	9
✓	22/04/2026	RMS Chesnut	MIL-VIC Rox	13
✓	01/04/2026	MIL Swala	MGR-MIL Abu	11
✓	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

Recently modified rats

See all

State	Identifier	Prefix	Name	Pup Name	Birth	Age	Death cause	Sex	Actions
✓	MGR62704M	MGR	Luigi	Black Russian	20/06/2026	4 mo	– alive –	♂
✓	MGR62702M	MGR	Nournouson	Timor	17/06/2026	4 mo	– alive –	♂
✓	MGR62700F	MGR	Thelma	Barra	17/06/2026	4 mo	– alive –	♀
✓	MGR61695M	MGR-MIL	Abaddon †	Bâbord	04/04/2025	17 mo	Bronchitis, pneumonia	♂
✗	MGR61572M	MGR	T.J. (Taz Junior) †	Junior	15/04/2025	16 mo	Bronchitis, pneumonia	♂
✓	MGR61652M	MGR	Niquedouille †	Raisin	08/05/2025	16 mo	Lung tumor	♂
✓	MGR61828M	MGR	Feta	Washington	13/08/2025	14 mo	– alive –	♂
✓	MGR61653M	MGR	Tito	Pomelo	08/05/2025	17 mo	– alive –	♂
✓	MGR62734M	MGR	Scampi	Bali	17/06/2026	4 mo	– alive –	♂
✓	MGR62699F	MGR	Isa	Brava	17/06/2026	4 mo	– alive –	♀