biggest mistake when pairing early is hens are too fat and if your feeding a mix heavy in maize they can take along time to lay , put them on barley and wheat till they have laid , give a calcium supliment and mix a bit of grit in with there feed , or some soluble calcium in the water to ensure good egg formation and suply vitamins , all will help with geting hens to lay good eggs i even put live natural yoghurt in the water at this time right until youngsters weaned