Some people have red hair, and some have hair that is various shades of blond or brown. The myth is that red hair is determined by a single gene, with the allele for red being recessive to alleles for other colors.
Rotational grazing is another way to help let the grass recover. By moving the cattle from pasture to pasture over a certain period of time will help the grass grow. It can be time consuming and labor intensive but in the end it will mostly pay for itself.