EPR – Au Pays de Rattlousi 

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Statistics

Breeding statistics

Breeding activity period	2015–2025 (10 years, 6 months)

Declared litters	28 litters, 226 pups
⨽ internal (born in the rattery)	⨽ 28 litters, 226 pups
⨽ external (other contributed litters)	⨽ 0 litter, no pup

All rat records	236 rats
⨽ females	⨽ 144 females (61 %)
⨽ males	⨽ 92 males (39 %)

Litter statistics

Average mother age	196 days (6.4 months)
Average father age	347 days (11.4 months)
Average litter size	8.1 pups per litter
Average sex ratio	0.639 (about 14 females for 9 males)

Lifespan statistics

Bred rats recorded as deceased	194 rats (82.2 % of recorded bred rats)
⨽ declared with known date	⨽ 149 rats (76.8 %)
⨽ presumed dead	⨽ 45 rats (23.2 %)

Average lifespan of bred rats	21.8 months (♀: 21.8 months – ♂: 21.8 months)
⨽ infant mortality excluded	⨽ 22.4 months (♀: 22.9 months – ♂: 21.8 months)
⨽ accidents excluded	⨽ 23.2 months (♀: 23.7 months – ♂: 22.5 months)

Oldest bred rat	EPR Pantalaimon (deceased at 3 years, 3 months, 10 days)

Death causes statistics

Primary death causes by decreasing frequency

31.54 %	Other
22.15 %	Old age, natural death (from 24 month old minimum)
14.77 %	Unknown cause
8.72 %	Respiratory
6.04 %	Accidents, traumas, poisonings
4.7 %	Eye, ear, mouth, face
4.7 %	Neurological (brain, spinal cords, nerves)
2.68 %	Infant mortality (up to 6 week old)
2.01 %	Urinary system (kidney, bladder)
0.67 %	Muscles and skeleton
0.67 %	Digestive
0.67 %	Cardiovascular
0.67 %	Reproductive system

Secondary death causes by decreasing frequency

22.15 %	*Old age, natural death (from 24 month old minimum)
15.44 %	Undetermined tumor (affected organ unknown)
14.77 %	Undetermined cause (known date)
9.4 %	*Other
4.03 %	*Respiratory
3.36 %	Veterinary accident (anesthesia during a minor operation, medical error, etc.)
3.36 %	Bronchitis, pneumonia
2.68 %	Stroke
2.68 %	Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
2.01 %	Generalized cancer, leukemia, lymphoma
2.01 %	*Infant mortality (up to 6 week old)
1.34 %	Undetermined infection or abscess
1.34 %	Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
1.34 %	Pituitary tumor
1.34 %	Dental malocclusion
1.34 %	Renal failure
1.34 %	Domestic accident (crush, door...)
1.34 %	Zymbal gland tumor
0.67 %	Heart failure, valvular disease
0.67 %	Other head or neck related trouble
0.67 %	Uterus infection (metritis, pyometra)
0.67 %	Sepsis
0.67 %	Brain tumor
0.67 %	Lung tumor
0.67 %	Other respiratory trouble
0.67 %	Tooth abscess
0.67 %	Stillborn
0.67 %	Intestinal obstruction (excluding megacolon)
0.67 %	Muscle tumor
0.67 %	*Urinary system (kidney, bladder)
0.67 %	*Eye, ear, mouth, face

Related entries

Last contributed litters

See all

State	Birth date	Dam	Sire	Size	Actions
✗	08/12/2025	EPR Malenia	ARD Udachi	14
✓	24/05/2025	EPR Makalu	EPR Anathar	6
✓	29/01/2025	EPR Makalu	MIL Capitaine	10
✓	09/07/2024	ETR Nokstella	EPR-VIC Titi	14
✓	15/11/2023	MIL Sellen	EPR-VIC Sontar	12
✓	17/08/2022	LTE B'Queenie	EPR Koda	9
✓	17/06/2021	MIL Tempete	EPR Gribouille	9
✓	17/07/2020	EPR Kenya	MIL Fang Xin	11
✓	27/02/2020	EPR Vénus	EPR-NMS Perceval	14
✓	23/11/2019	EPR Moana	EPR-NMS Karadoc	15

Recently modified rats

See all

State	Identifier	Prefix	Name	Pup Name	Birth	Age	Death cause	Sex	Actions
✗	EPR61930F	EPR	Bridgess		08/12/2025	1 mo	– alive –	♀
✓	EPR61926F	EPR	Swan		08/12/2025	1 mo	– alive –	♀
✓	EPR61927F	EPR	Maiwen		08/12/2025	1 mo	– alive –	♀
✓	EPR61928F	EPR	Wanda		08/12/2025	1 mo	– alive –	♀
✓	EPR61931F	EPR	Ariane		08/12/2025	1 mo	– alive –	♀
✓	EPR61932M	EPR	Derek		08/12/2025	1 mo	– alive –	♂
✓	EPR61933M	EPR	Jasson		08/12/2025	1 mo	– alive –	♂
✓	EPR61934M	EPR	Santo		08/12/2025	1 mo	– alive –	♂
✓	EPR61935M	EPR	Dempsey		08/12/2025	1 mo	– alive –	♂
✗	EPR61936M	EPR	Sage		08/12/2025	1 mo	– alive –	♂