I think recommended times 18 days , as long as fertilized and not started to incubate you'l have no problem The sooner put under foster parents the better as less risk of eggs getting damaged
black treacle ( mollasses ) seems to work for me natural but probably too cheap , should stick a pigeon on and coin it in :emoticon-0164-cash: :emoticon-0164-cash: :emoticon-0164-cash: as for hurting yes if not treated and clear then you have worms with resistance to the drug your using
You can get away with 2 to 3 days older but any older they may come off them so no don't have to be same time , best to pair the stock first store eggs so not incubated and float them when fosters lay second egg
I know the Walkingshaws were Bakers x Kirkpatrick , I've tried speaking to a few Irish lads about them but with little joy there were a few Slaine /Sligo way a few years back , those that have them don't like parting with them