Growth and Development of Baby Rats Ann Muir Thomas November 3, 2001.

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Presentation transcript:

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: days Litter size: 1-20, average about 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!