The stomach has three types of contractions: There are rhythmic, 3 per minute, synchronized contractions in the lower part of the stomach, which create waves of food particles and juice which splash against a closed sphincter muscle (the pyloric sphincter) to grind the food into small particles.
7 What is the gestation period, how many babies do they have, and when are they weaned? 1  The gestation period for rats is 19â22 days, for mice it is 17â21 days.  Rats and mice average 8â12 babies in a litter, but can have as few as 1 or as many as 20.
Six mice can multiply into 60 mice in less than 3 months. One  female can have 5 to 10 litters per year. They have about 10 babies  per litter.ice are smaller than rats (averaging up to 5 inches in length, including tail) but they live longer and are more common. All of these rodents will eat food and chew on property if they find their way into a home. Severe rodent infestations can result in structural damage.