If you are following a user on twitter interested for his updates not for the retweets he shares, then you can disable or turn off that user’s retweets from appearing in your timeline without the need to unfollow that user, here is how.
Turn off a user’s Retweets
1. Click that username on Twitter which opens his mini-profile or reach his full profile page by visiting http://twitter.com/username in your browser .
2. Click Green Retweet icon which turns to grey color which means his retweets won’t appear in your timeline.
3. To enable retweets back again, click greyed retweet icon which turns to green color and his retweets will appear in your timeline.
Mind you can’t turn off retweets from users you are following in your timeline, instead you can unfollow those guys.