If you have created custom magento attributes , then you might need to show them on frontend . So, here is how to call them to your frontend :
If custom attribute which you have created is textarea or textfield then add the following code
< ?php echo $_product->getAttributeName() ?>
for example If I created custom attribute with attribute code published_date then your code will be
< ?php echo $_product->getPublishedDate() ?>
If custom attribute which you have created is a multiselect or a dropdown then add the following code
< ?php echo $_product->getAttributeText('published_date') ?>
If you have done all this and still the value is not displaying, then edit the attribute and make sure, you have switched on the option, SHOW ON PRODUCT LISTING.