for my English speaking friends

[nthdraft]

okay, I need help. We did some Christmas crackers this year, and you know you get a toy and a party hat and a joke inside, right? Well I do NOT get the joke I was given. Now I'm an old hand in English to American translating but this one I cannot figure out for the life of me. WIll someone of the English persuasion please translate the following into Americanese for me?

Q: what do you get when you cross a cow, a sheep, and a goat?
A: a milky baa kid

Thanks in advance