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My opinion only: The Partridge Rock chicks that I received from McMurray are not the best of breed. I think they are runty and not growing as one would expect. Two of them, at least, still prefer the pine shavings to food (I see the littlest ones digging in the shavings more often than I like), but they still have managed to survive and remain active. So I guess that's something, huh? I thought for sure they were doomed. They were moved from brooder boxes (Rubbermaid) in my living room to the brooder house at 6 days along with 10 Dark Cornish and the Free Rare Chick -- and they were put in with 25 Ideal chicks (5 Dark Cornish) that were 10 days older and quite a bit larger. No problems at all. None. A great co-mingling--which surprised me and made me quite happy.
The difference between Ideal's and McMurrary's chicks is like night and day. Ideal's babies all showed up very active, having been air shipped. McMurrary's were listless after being sent "Surface" mail. I lost one before I could get them in the brooder container in my living room. I had to get them to drink a few times before they perked up. The Ideal chicks were lively and rushed the food and water on their own. Because I got Dark Cornish in both orders, I can compare them. The growth of Ideal's Dark Cornish far outstrips the growth of McMurray's Dark Cornish. I lost one of McMurray's Dark Cornish at around 10 days. It just wouldn't grow. A couple of others were like this, but managed to survive. Oh and some of the McMurray chicks arrived with pasting; I could feel it when I pulled them from the box and got them to drink or I'd have never guessed they had it.
So, all this is to say that I think that I can't sex them yet because the Partridge Rocks from McMurray (just the ones I got, mind you) are not developing at the expected rate.
I doubt it's environmental either because we have one of those Ohio Station brooder hovers that Plamondon recommends and it allows for the chicks to self-regulate their warmth levels. So both batches of chicks, while being 10 days apart, could move to the location in the brooder house that best suited their warmth needs. They all get the same feed and water. And there is no bullying when I watch them ... about 1/2 to and hour a day. Two waterers and they started with 3 feeders, went up to 4 feeders and are now down to two (one red one with many holes and a large tube feeder. So everyone can get food and water as necessary all day and night.
And now I'm off to look up Mt. Healthy. Sounds like I should have checked them out initially, however, I'd never heard of them until now.