The results to date, from this sire breed comparison study indicate that with the contrasting Aberdeen Angus and Charolais sire breeds that is possible to achieve animal performance data comparable to well managed conventional suckler calf to beef systems (300 kg carcass for heifers in Nov and 400 kg carcass for steers in March). Similarly the responses to sire breed type, sex and date of slaughter for the organic beef animals are biologically compatible. Organic beef is produced under organic rules in response to consumer demand for organic product. The organic system contributes to the protection of the environment and animal welfare. “We have not inherited the world from our forefathers we have borrowed it from our children” (Kashmiri proverb)