How to speak of grass-fed beef

After giving my fellow classmates a speech concerning grass-fed beef and why it is superior to it's corn-fed rival, I find that I now need to critique myself on the presentation. After reviewing my 5 minute and 18 seconds of extreme persuasion I find that I had a couple flaws. For example, I made it appear as though I did not know what was going to happen next with my presentation. I looked back quite frequently at the screen to look at numbers which supported my case. Also, I had dressed in clothing not exactly deemed suitable for giving a speech that morning, thus giving me an unrefined look. On the plus side, I did give good counter arguments and looked confident when I gave the speech. My arm movement was a little excessive however it was not incredibly distracting. My tone and speed seemed to be about right for the class to fully comprehend what I was attempting so say and/or teach. The speech appeared to be well organized and the powerpoint assisted with displaying data and numbers which otherwise may have been forgotten or easily misinterpreted. Overall I felt my speech went well and I believe it was educational for my fellow classmates. Hopefully I helped shed some light on the beef industry and the different methods of raising beef. If it all went well, I may have convinced some to try grass-fed beef next time they go shopping for their next party or tailgating experience.