LYL – Lyléjagos la raterie 

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Statistics

Breeding statistics

Breeding activity period	2023–2025 (2 years, 3 months)

Declared litters	19 litters, 201 pups
⨽ internal (born in the rattery)	⨽ 18 litters, 188 pups
⨽ external (other contributed litters)	⨽ 1 litter, 13 pups

All rat records	200 rats
⨽ females	⨽ 93 females (46.5 %)
⨽ males	⨽ 107 males (53.5 %)

Litter statistics

Average mother age	260 days (8.5 months)
Average father age	431 days (14.1 months)
Average litter size	10.6 pups per litter
Average sex ratio	1.151 (about 8 males for 7 females)

Lifespan statistics

Bred rats recorded as deceased	70 rats (37.4 % of recorded bred rats)
⨽ declared with known date	⨽ 69 rats (98.6 %)
⨽ presumed dead	⨽ 1 rat (1.4 %)

Average lifespan of bred rats	20 months (♀: 20.2 months – ♂: 19.7 months)
⨽ infant mortality excluded	⨽ 21.5 months (♀: 21.5 months – ♂: 21.5 months)
⨽ accidents excluded	⨽ 22.2 months (♀: 22.2 months – ♂: 22.1 months)

Oldest bred rat	LYL eugène (deceased at 2 years, 6 months, 13 days)

Death causes statistics

Primary death causes by decreasing frequency

28.99 %	Respiratory
23.19 %	Unknown cause
10.14 %	Eye, ear, mouth, face
8.7 %	Accidents, traumas, poisonings
7.25 %	Old age, natural death (from 24 month old minimum)
7.25 %	Infant mortality (up to 6 week old)
5.8 %	Reproductive system
4.35 %	Other
2.9 %	Neurological (brain, spinal cords, nerves)
1.45 %	Digestive

Secondary death causes by decreasing frequency

26.09 %	Bronchitis, pneumonia
23.19 %	Undetermined cause (known date)
7.25 %	*Old age, natural death (from 24 month old minimum)
4.35 %	Sepsis
4.35 %	*Infant mortality (up to 6 week old)
2.9 %	Facial abscess (excluding teeth and Zymbal gland)
2.9 %	Mammary tumor
2.9 %	Falls, fractures, head or spinal cord trauma (excluding fights)
1.45 %	Digestive abscess
1.45 %	Stroke
1.45 %	Malformation, hydrocephalus
1.45 %	Pituitary tumor
1.45 %	Stillborn
1.45 %	Suffocation, choking
1.45 %	Domestic accident (crush, door...)
1.45 %	Lung tumor
1.45 %	Retro-orbital abscess
1.45 %	Veterinary accident (anesthesia during a minor operation, medical error, etc.)
1.45 %	Otitis, ear abscess
1.45 %	Tooth abscess
1.45 %	Other respiratory trouble
1.45 %	Zymbal gland tumor
1.45 %	Uterus infection (metritis, pyometra)
1.45 %	Heatstroke
1.45 %	Uterine tumor
1.45 %	Dental malocclusion

Related entries

Last contributed litters

See all

State	Birth date	Dam	Sire	Size	Actions
✓	26/10/2025	LYL Q-pide	LYL Nicolas	9
✓	22/09/2025	LYL Phillippine	LYL Oscar	5
✓	25/08/2025	LYL Q-lotte	LYL Lieu jaune	7
✓	21/07/2025	LYL Phyllis	LYL itsi bitsi teenie weenie george 2	5
✓	15/12/2024	LYL Limande	ETR Tristan	12
✓	25/11/2024	ETR benedicte	LYL itsi bitsi teenie weenie john	12
✓	01/07/2024	ETR Plume	ETR nimbus	7
✓	16/04/2024	LYL dixie	ETR Jacoby	14
✓	13/04/2024	LYL donna	ETR Jacoby	10
✓	01/04/2024	ETR Nurana	ETR Lucien	10

Recently modified rats

See all

State	Identifier	Prefix	Name	Pup Name	Birth	Age	Death cause	Sex	Actions
✓	LYL59475F	LYL	Loche †		01/04/2024	22 mo	Falls, fractures, etc.	♀
✓	LYL58625M	LYL	eugène †		18/07/2023	30 mo	Old age, natural death	♂
✓	LYL61645F	LYL	Rendez-vous sur la Cienega †		21/07/2025	6 mo	Undetermined cause	♀
✓	LYL58664F	LYL	hailey †		11/09/2023	28 mo	Undetermined cause	♀
✓	LYL58638F	LYL	fybie †		24/08/2023	29 mo	Old age, natural death	♀
✓	LYL58983M	LYL	Johnny rockfort †		17/12/2023	25 mo	Mammary tumor	♂
✓	LYL58444M	LYL	ducke †		10/07/2023	30 mo	Old age, natural death	♂
✓	LYL58653F	LYL	gait †		09/09/2023	28 mo	Bronchitis, pneumonia	♀
✓	LYL58655F	LYL	garence †		09/09/2023	28 mo	Lung tumor	♀
✓	LYL58641F	LYL	faith †		24/08/2023	28 mo	Facial abscess	♀