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					Originally Posted by Mardelin  Sun is a source of vitamin D and has very much to do with hormones.....it also, is a factor in the boys being sexually potent.  I learned this through canine reproduction seminars and through my reproduction vet.   Most animals, human and otherwise require sunshine... | 
 
  I also have study canine reproduction at school and second that comment. If a female is keep in the basement all the time, she might even start skipping heat eventually.  
You will get some vitamin D even if the sun have to go through the window. 
There is no life.. without sun.