I have Blue, Black and White...unfamiliar with the Partridge. All of my hens are solid breasted and thick thighs. They have a nice spread to their pelvis/legs and broad backs.
The 3 year old Blue hens do lay better numbers than the White hens...but I don't know the age on the White hens. I purchased them fully grown when Bo Garrett was reducing some from his White flock pen.
Excess bum fluff can affect fertility but does not impact laying. When in the breed pens, I do pull excess down around the vents to improve the egg fertility.
An eight month old cockerel can weigh 7 - 9 pounds. An older hen can weigh in at about 8 pounds. A late maturing bird, I don't butcher the cockerels earlier than 7 or 8 months of age because I wait to cull for the breed pens until I can really see the type.
A few of my hens have actually gone broody more than once this year...they make great incubators...making keeping them worth the feed they consume.
Thank you! They are not a breed that is readily available in my area and would have to be imported, but I've read good things about them and would find them a great addition to a sustainable DP flock as working broodies....beautiful working broodies! I find them to be a much better option for broodies than silkies...much better.