So the past 2 years this cow has had black calves with heavy roaming in them. Last years even had a white tail! Now this year she had a calf out of the same bull as last year and its all black! Not any white that I could see on it! Why would she go from having calves with heavy Shorty coloring to now pitch black? Last year all the baldies had blady calves and this year all black from them too? Does the bulls black genes get stronger with age? Sorry if I am confusing u with this question!