Well if you want prime meat but you don't wanna risk getting killed by trying to tame a Rex then a dodo will do the job:

1.tame a female and male dodo

2.mate the dodos

3. Incubate the eggs

4.put the parents to sleep

5. Kill the children and harvest they're meat

6. If the parents ask you where are they're children just say they escaped from you trying to tame them-