Till now Blogger used to have two Feed Control Options, a Short Feed or a Full Feed. The short feed, as the name suggests contains a short version of your post with HTML and images stripped off. The Full Feed contains everything including the images and the HTML. Now Blogger has added a third option which will give you better control over what gets displayed in your Feed.
The New “Until Jump Break” option is like the Full Feed but it will strip off everything after the jump break and it will also include a Read More Hyperlink with the “Post page link text:” which you have given in the Blog Post gadget’s Settings. If you are unaware of Jump breaks and Read more, checkout this link
To change the Feed Settings, follow these steps.
1. Login to you Blogger Dashboard and go to Settings > Site Feed
2. Change the Allow Blog Feeds Option and Click Save Settings