LYL – Lyléjagos la raterie 

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Statistics

Breeding statistics

Breeding activity period	2023–2026 (2 years, 8 months)

Declared litters	20 litters, 203 pups
⨽ internal (born in the rattery)	⨽ 19 litters, 190 pups
⨽ external (other contributed litters)	⨽ 1 litter, 13 pups

All rat records	202 rats
⨽ females	⨽ 95 females (47 %)
⨽ males	⨽ 107 males (53 %)

Litter statistics

Average mother age	258 days (8.4 months)
Average father age	444 days (14.6 months)
Average litter size	10.2 pups per litter
Average sex ratio	1.126 (about 9 males for 8 females)

Lifespan statistics

Bred rats recorded as deceased	113 rats (59.8 % of recorded bred rats)
⨽ declared with known date	⨽ 105 rats (92.9 %)
⨽ presumed dead	⨽ 8 rats (7.1 %)

Average lifespan of bred rats	21.9 months (♀: 20.8 months – ♂: 22.7 months)
⨽ infant mortality excluded	⨽ 23.1 months (♀: 22.2 months – ♂: 23.9 months)
⨽ accidents excluded	⨽ 23.8 months (♀: 23.2 months – ♂: 24.3 months)

Oldest bred rat	LYL david junior (deceased at 2 years, 9 months, 20 days)

Death causes statistics

Primary death causes by decreasing frequency

22.86 %	Respiratory
16.19 %	Unknown cause
16.19 %	Old age, natural death (from 24 month old minimum)
11.43 %	Other
7.62 %	Eye, ear, mouth, face
6.67 %	Accidents, traumas, poisonings
5.71 %	Reproductive system
5.71 %	Infant mortality (up to 6 week old)
4.76 %	Neurological (brain, spinal cords, nerves)
0.95 %	Urinary system (kidney, bladder)
0.95 %	Digestive
0.95 %	Cardiovascular

Secondary death causes by decreasing frequency

20.95 %	Bronchitis, pneumonia
16.19 %	Undetermined cause (known date)
16.19 %	*Old age, natural death (from 24 month old minimum)
8.57 %	Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
3.81 %	Mammary tumor
2.86 %	Sepsis
2.86 %	*Infant mortality (up to 6 week old)
1.9 %	Facial abscess (excluding teeth and Zymbal gland)
1.9 %	Stillborn
1.9 %	Otitis, ear abscess
1.9 %	Heatstroke
1.9 %	Falls, fractures, head or spinal cord trauma (excluding fights)
1.9 %	Stroke
1.9 %	Pituitary tumor
0.95 %	Digestive abscess
0.95 %	Heart failure, valvular disease
0.95 %	Suffocation, choking
0.95 %	Malformation, hydrocephalus
0.95 %	Domestic accident (crush, door...)
0.95 %	Lung tumor
0.95 %	Retro-orbital abscess
0.95 %	Veterinary accident (anesthesia during a minor operation, medical error, etc.)
0.95 %	Tooth abscess
0.95 %	Other respiratory trouble
0.95 %	Zymbal gland tumor
0.95 %	Uterus infection (metritis, pyometra)
0.95 %	Uterine tumor
0.95 %	Renal failure
0.95 %	Dental malocclusion
0.95 %	*Neurological (brain, spinal cords, nerves)

Related entries

Last contributed litters

See all

State	Birth date	Dam	Sire	Size	Actions
✓	15/03/2026	LYL Super nana	LYL marvin	2
✓	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

Recently modified rats

See all

State	Identifier	Prefix	Name	Pup Name	Birth	Age	Death cause	Sex	Actions
✓	LYL61903F	LYL	Une seule journée passée sans elle †		26/10/2025	8 mo	Heatstroke	♀
✓	LYL58979F	LYL	itsi bitsi teenie weenie tulipe †		08/12/2023	30 mo	Old age, natural death	♀
✓	LYL59138F	LYL	kathie †		26/03/2024	27 mo	Mammary tumor	♀
✓	LYL58668M	LYL	harry †		11/09/2023	33 mo	Old age, natural death	♂
✓	LYL58633F	LYL	floralie †		24/08/2023	– ?? –	No information	♀
✓	LYL58661M	LYL	gabin †		09/09/2023	– ?? –	No information	♂
✓	LYL58652F	LYL	galadrielle †		09/09/2023	– ?? –	No information	♀
✓	LYL58650F	LYL	géraldine †		09/09/2023	– ?? –	No information	♀
✓	LYL58649F	LYL	germaine †		09/09/2023	– ?? –	No information	♀
✓	LYL58667M	LYL	honoré †		11/09/2023	33 mo	Old age, natural death	♂