IRD – Les irradiés 

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Statistics

Breeding statistics

Breeding activity period	2013–2025 (11 years, 6 months)

Declared litters	7 litters, 93 pups
⨽ internal (born in the rattery)	⨽ 6 litters, 80 pups
⨽ external (other contributed litters)	⨽ 1 litter, 13 pups

All rat records	91 rats
⨽ females	⨽ 38 females (41.8 %)
⨽ males	⨽ 53 males (58.2 %)

Litter statistics

Average mother age	208 days (6.8 months)
Average father age	462 days (15.2 months)
Average litter size	13.3 pups per litter
Average sex ratio	1.395 (about 7 males for 5 females)

Lifespan statistics

Bred rats recorded as deceased	54 rats (69.2 % of recorded bred rats)
⨽ declared with known date	⨽ 30 rats (55.6 %)
⨽ presumed dead	⨽ 24 rats (44.4 %)

Average lifespan of bred rats	22.3 months (♀: 25.6 months – ♂: 20.3 months)
⨽ infant mortality excluded	⨽ 22.3 months (♀: 25.6 months – ♂: 20.3 months)
⨽ accidents excluded	⨽ 23.5 months (♀: 25.6 months – ♂: 22.2 months)

Oldest bred rat	IRD Syrah (deceased at 3 years, 2 months, 16 days)

Death causes statistics

Primary death causes by decreasing frequency

23.33 %	Old age, natural death (from 24 month old minimum)
20 %	Unknown cause
13.33 %	Other
10 %	Respiratory
10 %	Eye, ear, mouth, face
10 %	Neurological (brain, spinal cords, nerves)
6.67 %	Accidents, traumas, poisonings
3.33 %	Urinary system (kidney, bladder)
3.33 %	Skin

Secondary death causes by decreasing frequency

23.33 %	*Old age, natural death (from 24 month old minimum)
20 %	Undetermined cause (known date)
10 %	Undetermined tumor (affected organ unknown)
6.67 %	Bronchitis, pneumonia
6.67 %	Otitis, ear abscess
3.33 %	Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
3.33 %	Kidney tumor
3.33 %	Domestic accident (crush, door...)
3.33 %	Stroke
3.33 %	Facial tumor (excluding Zymbal tumor)
3.33 %	Epilepsy
3.33 %	*Respiratory
3.33 %	*Skin
3.33 %	*Other
3.33 %	*Neurological (brain, spinal cords, nerves)

Related entries

Last contributed litters

See all

State	Birth date	Dam	Sire	Size	Actions
✓	13/03/2025	IND Réglisse	IND Björn	16
✓	09/03/2025	IND Cajou	IND Sven	11
✓	12/09/2017	IND Alladin Sane	IRD Samson	12
✓	25/12/2016	IRD Princesse Mononoke	CRV-PVC Dr Gabs	13
✓	12/06/2016	LVM Ziggy Stardust	IRD Aslan	12
✓	26/12/2014	RLR Sailor Moon	IRD Marcel	14
✓	18/08/2013	IND Bulle	IND Nagato	15

Recently modified rats

See all

State	Identifier	Prefix	Name	Pup Name	Birth	Age	Death cause	Sex	Actions
✓	IRD61387M	IRD-RUE	Emile	Sisao	13/03/2025	6 mo	– alive –	♂
✓	IRD61321F	IRD-RUE	Flemeth	Hérens	09/03/2025	6 mo	– alive –	♀
✓	IRD61377F	IRD-RUE	Andrasté	Toblerone	13/03/2025	6 mo	– alive –	♀
✓	IRD61316M	IRD-RUE	Mochi	Galloway	09/03/2025	6 mo	– alive –	♂
✓	IRD61314M	IRD-RUE	Yuzu	Black Baldy	09/03/2025	6 mo	– alive –	♂
✓	IRD61384M	IRD-RUE	Groot	Blondel	13/03/2025	6 mo	– alive –	♂
✓	IRD61383M	IRD-RUE	Blaireau †	Villars	13/03/2025	1 mo	Fights, injuries, etc.	♂
✓	IRD61381F	IRD-RUE	Stella	Stella	13/03/2025	6 mo	– alive –	♀
✓	IRD61376F	IRD-RUE	Camille Bloch	Camille Bloch	13/03/2025	6 mo	– alive –	♀
✓	IRD61378F	IRD-RUE	Ovomaltine	Ovomaltine	13/03/2025	6 mo	– alive –	♀