I have 2 male cayugas & 1 female pekin. they have been raised together since being ducklings. i was wondering if i could expect some fertile eggs. so far - no. my friend who has 2 cayugas - 1 male/1 female & 1 female pekin gave me some of her eggs - all of hers are the same age as mine & were raised together also. we decided to incubate these eggs from both of our pens. well out of the ones that the pekin females laid - none are fertile. all of the pure cayuga eggs are fertile. is this normal or can i hope that the cayuga males will mate with the pekins?? and if they actually do produce would the product of those matings be "mules"? thanks.