Join Date: Jun 2010
Location: Southern California
• Horses: 0
I mean I'm sure it started with some sort of inbreeding but...less then you might think
Genetic disorders (which is what I would call this situation) are usually a random mutation that has chosen to show itself, sometimes caused by in-breeding, not always. My guess would be that they found a cow like this and bred it to see what would happen. This is where a punnet square comes in with all it's magic and a few generations later the scientists most likely effectively began breeding more and more extra muscly cows. Depending on wether this disorder is sex linked or not would change how much in-breeding is required.
I'm no expert of course but according to my college Bio 100 class...you wouldn't need too much in-breeding to do this, especially if you began with two unrelated or very very distantly related cows to start with.