Sheep chicks are eating to much grass

Sheep chicks are eating too much grass, this leaves a sheep farm saturated, the young sheep eat a lot of grass while the adult sheep cannot eat grass (because the young have already eaten everything), and their fur does not grow so that I can cut to make a farm.

 

I can only make a sheep farm if I increase the world tick to 12.

 

I do not believe that this is the only solution to this problem.