I enjoyed your question, "will this allow me to run faster and jump higher".
I have found that you can find anything on the internet to prove or dis-prove anything you want.
I can honestly say that converting to grass-fed beef has been a good thing for me personally. The only "lifestyle" change I made was eating grass-fed vs grain-fed. I still eat beef everyday and I don't exercise anymore or any less. Before the change, Doctor said my "numbers" were high. Blood pressure, cholesterol, ect. After making the change, and about 6 months, went back and numbers were "good" or in the "normal" range. Doctor stopped giving me a hard time about eating beef.
I can't say this works for everyone, but it did for me. The data that I found claimed that if you take the same cut of meat from a grass-fed vs a grain-fed animal, that the calories, saturated fat, cholesterol are all about a 1/3 less. I can't confirm or deny their study, just letting you know that I read it.
Maybe it was the change in the beef I eat, maybe not, but thought I could share with y'all.
Thanks