MGR – Les Magist-Rats 

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Statistics

Breeding statistics

Breeding activity period	2021–2025 (3 years, 8 months)

Declared litters	22 litters, 213 pups
⨽ internal (born in the rattery)	⨽ 16 litters, 169 pups
⨽ external (other contributed litters)	⨽ 6 litters, 44 pups

All rat records	201 rats
⨽ females	⨽ 105 females (52.2 %)
⨽ males	⨽ 96 males (47.8 %)

Litter statistics

Average mother age	235 days (7.7 months)
Average father age	467 days (15.3 months)
Average litter size	9.7 pups per litter
Average sex ratio	0.914 (about 12 females for 11 males)

Lifespan statistics

Bred rats recorded as deceased	84 rats (53.5 % of recorded bred rats)
⨽ declared with known date	⨽ 83 rats (98.8 %)
⨽ presumed dead	⨽ 1 rat (1.2 %)

Average lifespan of bred rats	17.2 months (♀: 18.6 months – ♂: 15.8 months)
⨽ infant mortality excluded	⨽ 18.4 months (♀: 19.5 months – ♂: 17 months)
⨽ accidents excluded	⨽ 19.5 months (♀: 20.5 months – ♂: 18.4 months)

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

Death causes statistics

Primary death causes by decreasing frequency

34.94 %	Respiratory
13.25 %	Other
8.43 %	Unknown cause
8.43 %	Reproductive system
7.23 %	Neurological (brain, spinal cords, nerves)
6.02 %	Eye, ear, mouth, face
6.02 %	Infant mortality (up to 6 week old)
6.02 %	Accidents, traumas, poisonings
3.61 %	Old age, natural death (from 24 month old minimum)
2.41 %	Muscles and skeleton
2.41 %	Urinary system (kidney, bladder)
1.2 %	Skin
1.2 %	Digestive

Secondary death causes by decreasing frequency

19.28 %	Bronchitis, pneumonia
13.25 %	*Respiratory
9.64 %	Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
7.23 %	Mammary tumor
7.23 %	Undetermined cause (known date)
4.82 %	Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
3.61 %	*Infant mortality (up to 6 week old)
3.61 %	*Old age, natural death (from 24 month old minimum)
2.41 %	Bone tumor
2.41 %	Zymbal gland tumor
2.41 %	Generalized cancer, leukemia, lymphoma
2.41 %	Stroke
2.41 %	Pituitary tumor
1.2 %	Other infant mortality cause
1.2 %	Facial tumor (excluding Zymbal tumor)
1.2 %	Brain infection, encephalitis, meningitis
1.2 %	Sepsis
1.2 %	Stillborn
1.2 %	Subcutaneous abscess
1.2 %	Lung tumor
1.2 %	Brain tumor
1.2 %	Tooth abscess
1.2 %	Uterine tumor
1.2 %	Renal failure
1.2 %	Pulmonary edema
1.2 %	Falls, fractures, head or spinal cord trauma (excluding fights)
1.2 %	Digestive tumor (stomach, liver, pancreas, intestines...)
1.2 %	Kidney tumor
1.2 %	*Eye, ear, mouth, face
1.2 %	*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
✗	MGR59018M	MGR-MIL	Taz †		25/11/2023	22 mo	Fights, injuries, etc.	♂
✗	MGR61698M	MGR-MIL	Eizer	Tribord	04/04/2025	5 mo	– alive –	♂
✓	MGR61573F	MGR	Sirtema	Sirtema	15/04/2025	5 mo	– alive –	♀
✓	MGR61702F	MGR	Rani	Airelle	08/05/2025	4 mo	– alive –	♀
✓	MGR61699F	MGR	Pomme	Pomme	08/05/2025	4 mo	– alive –	♀
✓	MGR61701F	MGR	Framboise	Framboise	08/05/2025	4 mo	– alive –	♀
✓	MGR59977M	MGR	Lupin †	Lupin	06/07/2023	26 mo	Undetermined cause	♂
✓	MGR60667F	MGR	Cloé †	Holstein	19/08/2024	13 mo	Kidney tumor	♀
✓	MGR61695M	MGR-MIL	Abaddon	Bâbord	04/04/2025	5 mo	– alive –	♂
✓	MGR61700F	MGR	Scampi	Figue	08/05/2025	4 mo	– alive –	♀