User blog comment:Elephant777/Long live the Queen, but how does she live? (Rexy)/@comment-17754282-20150306185039/@comment-26025032-20150418163722

Things were done differently in Isla Sorna vs Isla Nublar, which as noted by Hammond himself removed the gentic tamperment that Wu gave on the dinosaurs of Isla Nublar, which would allow the animals to grow and develop without the need for constant supply of lysine.

Isla Nublar's Dinosaurs including Rexy were given this lysine problem because it was a theme park where people would come and visit. It is a safety proceedure, which would insure that the dinosaurs would not live long off of anything long if it wasn't given to them by their handlers. So the farm animals, the humans killed, and the herbivores would have sustained a certain amount of lysine for an exended period of time, but one those resources were depleted they eventually die. The herbivores eat the plants, which more likely than not, that produce lysine for them would have been eaten within a short amount of time (it is an island, so the offer of such plants would have been desomated). A brach is a gigantic animal, and yes it would have kept a dinosaur like Rexy going for weeks, but for every week she survives on one brach that isn't enough to survive twenty-one years on an island (counting out eight brachiosaurus in the film). Other prey offered would been dangerous (Triceratops),  smaller (Galli), or as you metioned competitors (Diloph).

Now I am willing to believe that if. and a big IF. That is if the gallimimus's (not counting the other small dinosaurs) could breed constantly to repopulate their numbers as many times as 1 t-rex could eat them per month (not includeding as said competitors), and the gallies come how mangaed to find a different and renewable resource of Lysine, which in turn supports Rexy.

One other thing I was wondering though this is what you said first, and that is "replaced with superior stock". Do you man a complete dinosaur with out the frog genes? of just better genticly modified dinosaurs