MGR – Les Magist-Rats 

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Statistics

Breeding statistics

Breeding activity period	2021–2025 (3 years, 5 months)

Declared litters	20 litters, 187 pups
⨽ internal (born in the rattery)	⨽ 14 litters, 143 pups
⨽ external (other contributed litters)	⨽ 6 litters, 44 pups

All rat records	179 rats
⨽ females	⨽ 94 females (52.5 %)
⨽ males	⨽ 85 males (47.5 %)

Litter statistics

Average mother age	239 days (7.8 months)
Average father age	478 days (15.7 months)
Average litter size	9.4 pups per litter
Average sex ratio	0.904 (about 10 females for 9 males)

Lifespan statistics

Bred rats recorded as deceased	79 rats (58.5 % of recorded bred rats)
⨽ declared with known date	⨽ 78 rats (98.7 %)
⨽ presumed dead	⨽ 1 rat (1.3 %)

Average lifespan of bred rats	17.1 months (♀: 18.8 months – ♂: 15.2 months)
⨽ infant mortality excluded	⨽ 18 months (♀: 19.7 months – ♂: 16.1 months)
⨽ accidents excluded	⨽ 19.2 months (♀: 20.7 months – ♂: 17.5 months)

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

Death causes statistics

Primary death causes by decreasing frequency

37.18 %	Respiratory
14.1 %	Other
8.97 %	Reproductive system
7.69 %	Unknown cause
7.69 %	Neurological (brain, spinal cords, nerves)
6.41 %	Eye, ear, mouth, face
6.41 %	Accidents, traumas, poisonings
5.13 %	Infant mortality (up to 6 week old)
2.56 %	Muscles and skeleton
1.28 %	Skin
1.28 %	Digestive
1.28 %	Old age, natural death (from 24 month old minimum)
1.28 %	Urinary system (kidney, bladder)

Secondary death causes by decreasing frequency

20.51 %	Bronchitis, pneumonia
14.1 %	*Respiratory
10.26 %	Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
7.69 %	Mammary tumor
6.41 %	Undetermined cause (known date)
5.13 %	Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
2.56 %	Bone tumor
2.56 %	Zymbal gland tumor
2.56 %	Generalized cancer, leukemia, lymphoma
2.56 %	Stroke
2.56 %	Pituitary tumor
2.56 %	*Infant mortality (up to 6 week old)
1.28 %	Facial tumor (excluding Zymbal tumor)
1.28 %	Brain infection, encephalitis, meningitis
1.28 %	Sepsis
1.28 %	Stillborn
1.28 %	Subcutaneous abscess
1.28 %	Lung tumor
1.28 %	Brain tumor
1.28 %	Tooth abscess
1.28 %	Uterine tumor
1.28 %	Renal failure
1.28 %	Pulmonary edema
1.28 %	Falls, fractures, head or spinal cord trauma (excluding fights)
1.28 %	Digestive tumor (stomach, liver, pancreas, intestines...)
1.28 %	Other infant mortality cause
1.28 %	*Old age, natural death (from 24 month old minimum)
1.28 %	*Eye, ear, mouth, face
1.28 %	*Unknown cause

Related entries

Last contributed litters

See all

State	Birth date	Dam	Sire	Size	Actions
✗	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
✓	31/12/2023	VIC Cosma	PLS Dunkan	12

Recently modified rats

See all

State	Identifier	Prefix	Name	Pup Name	Birth	Age	Death cause	Sex	Actions
✓	MGR61574F	MGR	Zélya	Erionne	15/04/2025	4 mo	– alive –	♀
✓	MGR61571F	MGR	Jiji	Agria	15/04/2025	4 mo	– alive –	♀
✓	MGR61399F	MGR	Nora	Jelly	15/04/2025	4 mo	– alive –	♀
✓	MGR61575F	MGR	Sanna	Safrane	15/04/2025	4 mo	– alive –	♀
✓	MGR59127F	MGR-MIL	Nami †	Manta	04/03/2022	18 mo	Bronchitis, pneumonia	♀
✓	MGR57357M	MGR-MIL	Olaf †	Kivu	04/03/2022	17 mo	Bronchitis, pneumonia	♂
✓	MGR59016M	MGR-MIL	Liao †	Liao	25/11/2023	19 mo	Respiratory	♂
✓	MGR59017M	MGR-MIL	Nibbles †	Sepik	25/11/2023	20 mo	Brain infection, etc.	♂
✓	MGR59803M	MGR-MIL	Isaac		31/12/2023	19 mo	– alive –	♂
✓	MGR61583M	MGR	Patrocle	Abricot	08/05/2025	3 mo	– alive –	♂