Help with Genetics please?

The coats of Ayshire cattle contain patches of white and dark. Alleles of an autosomal gene control the dark colors: mahogany zygotes are mahogany colored; red zygotes are red colored. Mahogany is dominant to red in males and is recessive to red in females. A heterozygous bull is mated with a heterozygous cow. What proportion of the calves are expected to be red females?