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	90 rats
⨽ females	⨽ 37 females (41.1 %)
⨽ males	⨽ 53 males (58.9 %)

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	1.432 (about 10 males for 7 females)

Lifespan statistics

Bred rats recorded as deceased	54 rats (70.1 % 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 %	Kidney tumor
3.33 %	Domestic accident (crush, door...)
3.33 %	Stroke
3.33 %	Facial tumor (excluding Zymbal tumor)
3.33 %	Epilepsy
3.33 %	Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
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
✓	IRD61380F	IRD-RUE	Pranee	Orfève	13/03/2025	6 mo	– alive –	♀
✓	IRD61320F	IRD-RUE	Raya	Abondance	09/03/2025	6 mo	– alive –	♀
✓	IRD61388M	IRD-RUE	Schnuppi	Frey	13/03/2025	6 mo	– alive –	♂
✓	IRD61317M	IRD-RUE	Flitz	Black Angus	09/03/2025	6 mo	– alive –	♂
✓	IRD61313M	IRD-RUE	Zappel	Girolando	09/03/2025	6 mo	– alive –	♂
✓	IRD61318M	IRD-RUE	Harry	Brangus	09/03/2025	6 mo	– alive –	♂
✓	IRD61389M	IRD-RUE	Choco	Favarger	13/03/2025	6 mo	– alive –	♂
✗	IRD61376F	IRD-RUE	Amba	Camille Bloch	13/03/2025	6 mo	– alive –	♀
✓	IRD61387M	IRD-RUE	Emile	Sisao	13/03/2025	6 mo	– alive –	♂
✓	IRD61321F	IRD-RUE	Flemeth	Hérens	09/03/2025	6 mo	– alive –	♀