MGR – Les Magist-Rats 

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Statistics

Breeding statistics

Breeding activity period	2021–2026 (4 years, 5 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	251 rats
⨽ females	⨽ 130 females (51.8 %)
⨽ males	⨽ 121 males (48.2 %)

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	0.931 (about 1 female for 1 male)

Lifespan statistics

Bred rats recorded as deceased	117 rats (56.5 % of recorded bred rats)
⨽ declared with known date	⨽ 115 rats (98.3 %)
⨽ presumed dead	⨽ 2 rats (1.7 %)

Average lifespan of bred rats	19 months (♀: 20 months – ♂: 18 months)
⨽ infant mortality excluded	⨽ 19.9 months (♀: 20.8 months – ♂: 19 months)
⨽ accidents excluded	⨽ 20.8 months (♀: 21.5 months – ♂: 20 months)

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

Death causes statistics

Primary death causes by decreasing frequency

34.78 %	Respiratory
12.17 %	Other
8.7 %	Reproductive system
8.7 %	Unknown cause
7.83 %	Eye, ear, mouth, face
6.96 %	Neurological (brain, spinal cords, nerves)
6.96 %	Old age, natural death (from 24 month old minimum)
5.22 %	Accidents, traumas, poisonings
4.35 %	Infant mortality (up to 6 week old)
1.74 %	Urinary system (kidney, bladder)
1.74 %	Muscles and skeleton
0.87 %	Skin
0.87 %	Digestive

Secondary death causes by decreasing frequency

21.74 %	Bronchitis, pneumonia
11.3 %	*Respiratory
7.83 %	Undetermined cause (known date)
6.96 %	Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
6.96 %	*Old age, natural death (from 24 month old minimum)
5.22 %	Mammary tumor
4.35 %	Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
2.61 %	Sepsis
2.61 %	Zymbal gland tumor
2.61 %	Generalized cancer, leukemia, lymphoma
2.61 %	Uterine tumor
2.61 %	Stroke
2.61 %	*Infant mortality (up to 6 week old)
1.74 %	Pituitary tumor
1.74 %	Tooth abscess
1.74 %	Bone tumor
0.87 %	Digestive tumor (stomach, liver, pancreas, intestines...)
0.87 %	Falls, fractures, head or spinal cord trauma (excluding fights)
0.87 %	Kidney tumor
0.87 %	Other infant mortality cause
0.87 %	Facial tumor (excluding Zymbal tumor)
0.87 %	Facial abscess (excluding teeth and Zymbal gland)
0.87 %	Other head or neck related trouble
0.87 %	Testicular tumor
0.87 %	Subcutaneous abscess
0.87 %	Brain infection, encephalitis, meningitis
0.87 %	Stillborn
0.87 %	Lung tumor
0.87 %	Brain tumor
0.87 %	Pulmonary edema
0.87 %	Renal failure
0.87 %	*Neurological (brain, spinal cords, nerves)
0.87 %	*Eye, ear, mouth, face
0.87 %	*Unknown cause

Related entries

Last contributed litters

See all

State	Birth date	Dam	Sire	Size	Actions
✗	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
✓	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

Recently modified rats

See all

State	Identifier	Prefix	Name	Pup Name	Birth	Age	Death cause	Sex	Actions
✓	MGR61824F	MGR	Oksana †	Nebraska	13/08/2025	9 mo	Respiratory	♀
✓	MGR59805M	MGR	Éden  †		21/01/2024	28 mo	Old age, natural death	♂
✓	MGR62167F	MGR	Winry	Sechura	30/12/2025	5 mo	– alive –	♀
✓	MGR62166M	MGR	Zuma	Ténéré	30/12/2025	5 mo	– alive –	♂
✓	MGR62222M	MGR-MIL	Jaz	KSI	12/01/2026	4 mo	– alive –	♂
✓	MGR62209M	MGR	Balto	Peket	06/01/2026	5 mo	– alive –	♂
✓	MGR60401M	MGR	Truc †		21/01/2024	28 mo	Old age, natural death	♂
✓	MGR62344F	MGR	Australis	Corona Australis	22/04/2026	1 mo	– alive –	♀
✓	MGR62345F	MGR	Borealis	Corona Borealis	22/04/2026	1 mo	– alive –	♀
✓	MGR62256F	MGR	Summer	Summer	09/03/2026	2 mo	– alive –	♀