It is, but still it quite open what happens if you'd deny a normal growth. Animals are no machines where you simply disable a gene and it works like you expect

It is, but still it quite open what happens if you'd deny a normal growth. Animals are no machines where you simply disable a gene and it works like you expect it to work. We're not even sure what a huge amount of the DNA really does (and what it doesn't). So playing around with such stuff is trial-and-error as you see on virtually any such experiments (Orange trees, potatoes, cloned sheeps, etc.).