Docstoc

Growth and Development of Baby Rats

Document Sample
Growth and Development of Baby Rats Powered By Docstoc
					Growth and Development
     of Baby Rats
     Ann Muir Thomas
     November 3, 2001
      Rat Breeding Facts

•   Rats sexually mature at 6-10 weeks
•   Female heat cycle every 4-5 nights
•   Gestation: 21-23 days
•   Litter size: 1-20, average about 10-12
•   Females are excellent mothers
                     Day 1
• Birthweight: ~5 grams
• Weight doubles in 48
  hours
• Ears and eyes are
  sealed
• No fur but whiskers
• Milk in stomach visible
• Can turn upright within
  24 hours
                  Day 7

• Weight: 20 grams
• Markings visible
• Starting to grow fur
• Creep forwards and
  backwards
• Ears open
                 Day 14

• Weight: ~35 grams
• Eyes open
• Leave nest for short
  periods
• Start nibbling on
  solid food
• Curious
                 Day 21

•   Weight: ~60 grams
•   Eat solid food
•   Nurse frequently
•   Very playful
•   Seek human contact
                  Day 28

•   Weight: 80+ grams
•   Nursing rarely
•   Can be weaned
•   Very playful
•   “Parasites” on mom!
             Summary
• Rapid development serves rats’
  evolutionary niche.
• Rats are easy to breed and raise, unlike
  many other rodents.
Rats Make Great Pets!

				
DOCUMENT INFO
Shared By:
Categories:
Stats:
views:215
posted:7/6/2011
language:English
pages:9