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Growth and Development in the Rat

Rats are so amazing and make great pets.  When you adopt rats into your life, you experience a warm, sweet, intelligent animal that really bonds with you!  Watching your kitten develop from birth until you bring them home is a wonderful expereince.  This web page is meant to inform the pet adopter and rescuer.  It is meant to educate and prevent unplanned litters.  

Pregnancy

Pregnancy, or gestation, lasts approximately 21 days, in the rat.  You can tell when a rat is pregnant by looking at their mid-section.  You will see a distinct bulge in the later half of pregnancy, as the kittens develop.  A rat may not start "showing" until the last week of pregnancy.  The best way to determine pregnancy is by measuring an increase in body mass, by using a postal scale.  Standard sized Does can have anywhere from 2-16 kittens on average.  

 

Birth

 
 This mother, Ava, a Russian Blue Blazed Berkshire, just gave birth to her kittens.  She used her teeth and hands to help give birth to her baby ratlets.  When they are born they are still conected to mom by their umbilical cord.  the mother will chew the cord and eat the afterbirth.  This is normal. Now, she is on her side nursing.  Ava is a very calm rat and allowed me to be present and handle the kittens right away.  It is suggested that you watch a mother give birth, howewver also provide privacy.  There are some instances where females, especially first time mothers, or young mothers, who are nervous about the birthing process and they might reject their offspring or attack them.  

 

 When the kittens are born, they do not have a coat of fur.  They depend on mom to provide warmth.  It is important that baby ratlets remain warm.  There is also a little blood from the process of birthing as well.  as long as it is spotting and not a lot of blood, then this is normal and no cause for alarm.  If there is a lot of blood or it continues after the ratlets are born, you should take the mother and kittens to the vet.  Excessive bleeding will cause death.

 

If you look closely at this kitten, you will see a white strip near it's mid-section.  This is milk in the ratlets belly!  You can see it through their translucent skin.  It is believed that a female will look to see who has a the white ring.  It tells her who is "full" or not.  Sometimes, with larger litters you will see does separate their litters into groups.  This behavior is thought to ensure that all of the kittens get an equal share, instead of certain more aggressive kittens nursing more than others.  

 

Week 1: Staying Close to Home

 

This is a picture of a newborn kitten at 24 hours old.  They have loose skin, skin over their eyes, very tiny ears that are pressed tight to the body, tiny webbed like feet with little definition and a small tail.  

 

By the second day of life, their skin is not so loose and their ears pop away from their heads.  Already their little feet are starting to develop into longer toes.  

 

By three days, they can hold their head up.  This kitten is sniffing the air, a rats best sense, to find it's other littermates.  

 

This four day old kitten will eventually become a black top eared capped hairless with a diamond shaped head spot.  You can tell what coat type a rat will be by looking at their whiskers.  If the whiskers shoot out straight, the rat will be a smooth coat.  If the whiskers are kind of curly, they will most likely be a rex and if they are super super curly they will be hairless.  You will also notice a difference in the coat of rex in comparison to a smooth coat once they start to come in a few days.  

 

Day 6 The kittens are developing color which is pigment produced by skin cells.  They have more mobility and their ears and toes are longer and more detailed.  Finally, you can see more of an eyelid, although they do not open their eyes yet for several days. 

This black kitten is seven days old and a dumbo eared self smooth coat.  He does have a little white on his feet.  They call this "mittens".  By the time the kittens are seven days old, they are really trucking around.  They will stay in the nest for the most part, but when they are placed in an open area, they search for litter mates, the nest and mom by lifting their head and crawling around.  When they get to this age, I like to spend more time with them in the pouch.  I talk to them, and touch them gently so they get used to my smell.

Week 2: Yeah! We Can Open Our Eyes!

 

By the second week of life the coat is starting to come in.  Rex kittens have a slight wave to their coat (right) and smooth coated kittens have very shiny smooth fur or hair.  

 

 Another exciting development that occurs between 12-14 days, is opening of the eyes.  Once they are open, watch out!  The kittens start to feel more ambitious about leaving the nest and traveling a bit.

 

Once the kittens can see, and leave the nest, they also start nibbling on dry food.  We offer lots of veggies and fruits each day.  Mom brings things back to the nest, so the kittens get to taste a little of everything.

 

Week 3: Mov'n and Groov'n

 

Week three is very exciting, indeed!  Cute, Cute, Cute!  Kittens have put on some weight, they have more motor control, and really recognize that you exist!  They want to be where the action is!  They will attack your hand, chew on your fingers, and groom you.  Some kittens even start giving kisses at this age, licking you!  They are very sweet and impressionable.  We spend lots of time with kittens at this age.  Gently picking them up, talking to them, putting them in the pouch as a group and singly.  We also gently pet them, and even occasionally kiss their little chubby bellies!  :)  

Week 4: Gotta Keep'm Separated!

 

The boy on the left is a male Russian blue capped possum faced dumbo rex and the female on the right is a Russian Blue top ear Berkshire rex.  By four weeks, the ratties are very desirous of attention by their humans and sexually mature.  It is important that they are separated by gender in cages so that there is no accidental pregnancies.  We gently handle this age group and spend about an hour or two with them daily in the morning and night.  We talk to them, and continue to use a pouch, because this will help them learn our smell, to trust us and develop socially with humans until they go home to their new families.  

 

In order to separate the males and females properly, you must know what each gender looks like.  The best way to determine gender is to look at their body parts! lol  This is a male (above) by four weeks you can clearly see the scrotum.  

 

The picture (above) shows a female.  

 

Week 5-10: Independence! Off to New Homes!

By now the ratlets really want to explore everything.  Before, they would be content to sit on my shoulder or hide in the pouch but now, they want to go everywhere.  It is a very incredible phase of their lives too.  Around 4-6 weeks, they need us to provide a stable environment.  That is why we adopt out at 6 weeks.  They are still continuing to develop their opinions about humans.  They are growing very quickly and eating everything in sight.  We try to handle them a specific way as to support all parts of their now larger body. In addition, we slowly introduce them to new envronments so that they have positive experiences.  This early training allows them to be fully adjusted and ready to make fabulous new additions to your home.  

Adult Rats

When a rat is properly handled, loved and cared for, they are great pets and can live for 2-3 years.  Rats are intelligent, interesting, beautiful, easy to care for, and bond with their humans.  

    

This is a picture of one of my squishy ratties named Ollie!  He is now an adult male.  Male rats can get between 9-11 inches long, females are smaller.  This is a medium sized boy and very very calm and affectionate.  Ollie is a Russian Blue agouti dumbo rex.  This picture really captures his demeanor. 

This is a hairless dumbo female, named Bijou.  Hairless are born with a fine coat of hair and then end up losing it when they molt.  Some hair may come back a little but over time, however, they will lose all of their hair (depending on the line). 

 

This is a female Russian Dove top ear Smooth coat named, Safire.  She is a very sweet, calm and beautiful rattie girl!

Additional Information

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