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Hi eleanor
Usually hens are vaccinated against diseases such as marek's disease (usually done in day old chicks I think), gumboro (aka infectious bursal disease/IBD), Avian Pneumovirus (ART), Infectious Bronchtis and I think Newcastle Disease. There may be more, but I think they may be the standard for commercial birds.
I'm not sure whether vets would advise giving small flocks of 'pet' chickens all of these, although newcastle disease and marek's disease are pretty horrible ways to die. IB usually affects laying more than anything I think.
Anyway there's plenty of info out on the web if your daughter needs to know more. Our ex-batts, coming from intensive farming systems, were already vaccinated so it's not something I'm knowledgable about really.
Hope the girls start laying soon... usually when they come into lay the colour of their legs start to change. In 'brown' hens their legs go from yellowish to whiter coloured scales. Not sure about other colours though!
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