the first chicks I hatched out 3-29-2010  are a cross marans (cuckoo cross Black coppermarans)    Are layer now.   They would lay a egg and then quit or hide a egg.   last month.   They free range so note sure.   Now they are using the nest box.  So around 7 months...   I fine my marans only lay a few eggs and get broody.  Especially the cuckoos.  How about your marans.
People are saying why would you cross the two colors.   The cuckoo marans hen I got for a Breeder here in California  the egges had horrible color, not much darker than a rhode island red egg.   So I had a BCM from a very dark line of egg layers.   I knew the chicks would be easy to sex because the pullets would be black roos would be barred.  To make a long story short the hens are laying beautiful dark brown eggs, two to three shade darker than there moms.   will cross them back to there father to see if I can get even darker eggs,
PS    Also cross the same roo in to 1 EE hen (blue egg layer)   her pullets had not started laying or they have a brown not sure which way.   All her pullets look just like her.
PSS   I dont show birds and have no want to show chickens   just like the pretty eggs