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 (up to the maximum cap) and it will reset to 0 after your dragon advances 10 levels.
You may also get feeding XP bonuses from things like Equipment/Trinkets. 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.