The 'Temporary Dragon XP Bonus' displayed above your dragon's blue XP bar is only affected by your Daily Free Feeding. Remember, you will get 1 Free Feeding per day which does not consume any of your resources.
This temporary bonus increases each day that you use your Daily Free Feeding until you reach a cap, and it will reset to 0 after your dragon advances 10 levels.
You may also receive feeding experience bonuses from things like Equipment/Trinkets. If you tap on the “i” Icon to the left of the Temporary Dragon XP Bonus, you will be able to view all the bonus sources currently impacting your Feeds. This total can also be seen by tapping on the image by “Select Feed” and viewing the Active Boosts total in green.
These bonuses will not appear in the Stats tab of your House Information screen, but instead under the Dragon Stats screen. You can access your Dragon Stats by tapping the Stats icon at the bottom of the screen when you first enter your Dragon Pit. Tapping the arrow icon to the right of any stat category will expand it so you can view your current stats and bonuses.