Nice pair of youngens mate,percy's not choosey round here, saying that she had a go at this one a couple of week ago,but it's survived a couple of seasons,hope it sees this one out aswell.
Not to i get youg away from the racers,last year I got caught out and was hit by a peregrine loosing three cocks,all other nest were full and I lost three pair yougens in the nest.Bad start to the season. When I start I'll be taking them 20 mile a few times then on the transporter till I think they are right to race.
I would check you ventilation mate,damp stale air would start the droppings to go mouldy,but I must admit it's been a long old winter and lack of sunshine doesn't help anything. Lindsay