Here are a few of our Brown Swiss milk cows. Note how big they are compared to the Jersey-cross in between them.
(The reddish-brown one is probably an Ayrshire or maybe Red Holstein, hard to tell.)
Though primarily a Holstein herd, we have many crosses - and Jersey, French Normande, Lineback, Charolais, Guernsey, and Ayrshire cows in the dairy. There is even a Hereford!
(I do believe that brown one is a Guernsey.)