DEL – D’ Ombre et de Lumière 

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Statistics

Breeding statistics

Breeding activity period	2016–2026 (10 years)

Declared litters	56 litters, 633 pups
⨽ internal (born in the rattery)	⨽ 41 litters, 452 pups
⨽ external (other contributed litters)	⨽ 15 litters, 181 pups

All rat records	619 rats
⨽ females	⨽ 323 females (52.2 %)
⨽ males	⨽ 296 males (47.8 %)

Litter statistics

Average mother age	232 days (7.6 months)
Average father age	517 days (16.9 months)
Average litter size	11.3 pups per litter
Average sex ratio	0.916 (about 12 females for 11 males)

Lifespan statistics

Bred rats recorded as deceased	348 rats (77.3 % of recorded bred rats)
⨽ declared with known date	⨽ 341 rats (98 %)
⨽ presumed dead	⨽ 7 rats (2 %)

Average lifespan of bred rats	22.3 months (♀: 23.7 months – ♂: 20.7 months)
⨽ infant mortality excluded	⨽ 24.5 months (♀: 25.7 months – ♂: 23.1 months)
⨽ accidents excluded	⨽ 25.6 months (♀: 27.3 months – ♂: 23.8 months)

Oldest bred rat	DEL-MOL Seren (deceased at 4 years, 19 days)

Death causes statistics

Primary death causes by decreasing frequency

20.53 %	Respiratory
15.84 %	Other
10.85 %	Old age, natural death (from 24 month old minimum)
9.68 %	Unknown cause
9.09 %	Infant mortality (up to 6 week old)
7.92 %	Accidents, traumas, poisonings
7.62 %	Neurological (brain, spinal cords, nerves)
5.57 %	Eye, ear, mouth, face
4.69 %	Digestive
3.81 %	Cardiovascular
2.93 %	Reproductive system
0.88 %	Urinary system (kidney, bladder)
0.59 %	Skin

Secondary death causes by decreasing frequency

12.02 %	Undetermined tumor (affected organ unknown)
10.85 %	*Old age, natural death (from 24 month old minimum)
9.68 %	Undetermined cause (known date)
9.09 %	Bronchitis, pneumonia
7.33 %	*Respiratory
4.69 %	*Infant mortality (up to 6 week old)
3.81 %	Stillborn
3.23 %	Lung tumor
3.23 %	*Neurological (brain, spinal cords, nerves)
2.93 %	Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
2.35 %	Zymbal gland tumor
2.35 %	Domestic accident (crush, door...)
2.05 %	Heart failure, valvular disease
2.05 %	Veterinary accident (anesthesia during a minor operation, medical error, etc.)
2.05 %	*Other
1.76 %	Pituitary tumor
1.76 %	Digestive tumor (stomach, liver, pancreas, intestines...)
1.47 %	Facial tumor (excluding Zymbal tumor)
1.17 %	Other heart or vascular problem
1.17 %	Stroke
1.17 %	Mammary tumor
0.88 %	Other digestive trouble
0.88 %	Tooth abscess
0.88 %	Uterine tumor
0.88 %	Undetermined infection or abscess
0.59 %	Intestinal obstruction (excluding megacolon)
0.59 %	Brain tumor
0.59 %	Other respiratory trouble
0.59 %	Digestive abscess
0.59 %	Epilepsy
0.59 %	Other infant mortality cause
0.59 %	Complications of gestation or parturition
0.59 %	Heart attack, infarct, pulmonary embolism
0.29 %	Falls, fractures, head or spinal cord trauma (excluding fights)
0.29 %	Retro-orbital tumor
0.29 %	Food poisoning
0.29 %	Renal failure
0.29 %	Liver failure
0.29 %	Digestive hemorrhage
0.29 %	Generalized cancer, leukemia, lymphoma
0.29 %	Euthanasia without medical cause
0.29 %	Otitis, ear abscess
0.29 %	Bladder tumor
0.29 %	Subcutaneous abscess
0.29 %	Progressive spinal cord damage, degenerative paralysis
0.29 %	Sepsis
0.29 %	Other reproductive system disorder
0.29 %	Kidney tumor
0.29 %	Skin tumor, skin cancer
0.29 %	Hereditary megacolon
0.29 %	Pulmonary edema
0.29 %	*Eye, ear, mouth, face

Related entries

Last contributed litters

See all

State	Birth date	Dam	Sire	Size	Actions
✗	29/10/2026	OPR-DEL Meteor Nouille Kick	DEL Ammonite	14
✗	11/10/2026	CHC-HPM Wollemia	OPR Herugrim	14
✓	13/05/2026	OPR Narya	DEL Silco	11
✓	21/04/2026	OPR Vilya	DEL Oz	11
✓	29/03/2026	DEL Shambala	DEL To Aslan's Camp	16
✓	12/10/2025	PRH-LVM Tianhe la Rivière Céleste	DEL Infinity	15
✓	07/08/2025	DEL Kendra	DEL Tricatel	12
✓	27/07/2025	DEL Tanya	MIL-DEL Gurney Halleck	14
✓	10/07/2025	DEL Sevika	DEL Nicodemus	14
✓	01/07/2025	DEL-RMJ Mystère	DEL Infinity	12

Recently modified rats

See all

State	Identifier	Prefix	Name	Pup Name	Birth	Age	Death cause	Sex	Actions
✓	DEL60249F	DEL	Pamela Rose †		26/05/2024	28 mo	Uterine tumor	♀
✓	DEL60255M	DEL	Ratatouille  †	Igor d’Hossegor	26/05/2024	23 mo	Zymbal gland tumor	♂
✓	DEL60256M	DEL	Ludwig von Apfelstrudel †	Ludwig von Apfestrudel	26/05/2024	29 mo	Undetermined cause	♂
✗	DEL61961M	DEL	Heavenly Creatures †		10/07/2025	15 mo	Undetermined cause	♂
✓	DEL59461F	DEL	Nyota	Thorn	31/10/2023	36 mo	– alive –	♀
✓	DEL61333F	DEL	Diadem †	Isha	05/12/2024	23 mo	Digestive tumor	♀
✓	DEL62516F	DEL	Etoile	Nos étoiles contraires	29/03/2026	7 mo	– alive –	♀
✓	DEL62515F	DEL	Dolo	Alabama Monroe	29/03/2026	7 mo	– alive –	♀
✓	DEL61075M	DEL	Neptune †	Dersu	19/11/2024	23 mo	Heart failure, etc.	♂
✓	DEL58383M	DEL	Radiateur †	Sullu	30/04/2023	39 mo	Old age, natural death	♂