organic is important & i commend your interest, but as a nutrition major, I think you've overlooked one of the most crucial factors...
Cows naturally graze on grass. They're rumnants, meaning they possess a 45-gallon rumen (like a stomach) which converts omega 3 and 6-rich grasses into lean protein. When cattle are raised commercially, they're fed cheap grains (corn and soy) which fatten them up, but make them very sick (nearly 70% of commercial cattle develop pnemonia by the time they're slaughtered). Commercial farmers then must feed the cows antibiotics to maintain their health until they reach market weight. In addition to creating antibiotic resistance, feeding cattle grains also has negative environmental impacts. (in order to be organic, can't feed antibiotics). Since cows aren't designed to ingest/digest grains, they develop thick layers of esophageal mucus and burp excessively when feeding. The burping releases levels of methane into the environment significantly higher than farting would...and methane is the fastest-rising greenhouse gas (contributes to global warming). As for health implications- grain-fed cattle is often more than 3 times higher in fat (saturated fats too) than grass-fed and has been shown to contribute to heart disease (#1 cause of death in the US) and various other diseases.
And another thing- grass fed beef is DELICIOUS. Hard to find (i get ground grass-fed for $8/lb @ a healthfood store) but it tastes much different (better) and i eat it sparingly.
If ya wanna raise organic cattle, gotta do it right. Best of luck my man (and sry if somebody already posted about this)