People are running to garden centers now to get what they need for their garden. They no doubt will pick up a bag of steer manure. Can someone tell me why steer manure is better than cow manure or heifer manure?

Also, if it comes from a feedlot and run through a factory that bags it how do they separate the boy from the girl manure? If you think there is a difference, you're full of what you just bought......