I go through 4000lbs every 35 days. Here is a complete chart..
Rats

Scientific Name: Rattus novegicus
Class: Mammalia
Order: Rodentia
Body Temp: 90 degrees F (35.9 - 37 5 degrees C)
Respiration Rate: 85.5 BPM

Weight:

* Adult Male 300 g
* Adult Female 200 g
* Newborn 5 g

# Water Consumption: 40 ml (100 ml/kg/day)

Food Consumption: 32 gm (100 ml/kg/day)

Sexual Maturity:

* Male 13 weeks
* Female 13 weeks

# Estrus Cycle: 4 - 5 days

Gestation period: 20 - 22 days

Life Span: 3 years

Avg. Litter size: 7 - 11

Breeding Life:

* Male 1.5 years
* Female 1.5 years

# Age at weaning: 21 days

Recommandad Temperature: 64.4-78.8 degrees F(18-26 degrees C)

Relative Humidity: 40 -70%

Photo Period (light/dark): 12/12

Identification Methods: ear notch, punch; tattoo

* Housing Requirements: floor area/animal = 17 - 70 sq. in.
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Mice

Scientific Name: Mus musculus

Class: Mammalia

Order: Rodentia

Body Temp.: 99 degrees F (36.5-38 degrees C)

Respiration Rate: 163 BPM

Weight:

* Adult Male 25 - 50 gm
* Adult Female 25 - 50 gm
* Newbom 1.0 gm

# Water Consumption: 15 ml/100 gm/day

Food Consumption: 15 gm/100 gm/day

Sexual Maturity:

* Male 7 weeks
* Female 7 weeks

# Estrus Cycle: 4 - 5 days

Gestation period: 19 - 21 days

Life Span: 2 years

Avg. Litter size: 5 - 10 pups

Breeding Life:

* Male 8 months
* Female 8 months

# Age at weaning: 21 days

Recommended Temperature: 64.4-78.8 degrees F(18-26 degrees C)

Relative Humidity: 4 0 - 7 0 %

Identification Methods: ear tags, ear punch, notch

Photo Period (light/dark): 10/14

* Housing Requirements: floor area/animal = 6 -15 sq. in.