Comparing 2 different breed sizes at the same age. (pictures soon)

[krants]

I am a bit confused at the growth rate of both my chicks. I have a Danish Brown Leghorn and a Blue Marans chick both assumed to be 2 weeks today.

I got my Leghorn from a feed supply store and they told me at the time they were 1 day old when they received them on Thursday the 11th. I got her on the Saturday the 13th.
The Blue Marans I was told was 10 days when i got it on last Saturday. Today would be their 14th-15th day if I am adding correctly.

Here is where the confusion comes in. The Leghorn is getting fairly big. About 1/2-5/8 inch long tail feathers, longer wing feathers and getting feathers on her shoulders. The Blue Marans chick isn't developing too much other than the wing feathers and looks like the Leghorn did on about day 6-7. Do these two breeds mature at a different rate or is this a gender difference? The Leghorn should be a pullet (they were labeled as so in the store) and I have gotten a few responses about the BM being a girl and a few saying maybe roo. I know it sounds bad but I would rather give one away if it were a roo than raise it the 5+months to hear it (not my choice, other household members).

Pictures to come around 6 California time.

 

[mstricer]

It sounds like the leghorn is a rooster.

 

[krants]

Serena (leghorn) & Onyxia (BM) through the gates

Chickens moon too!

Neck to neck. Serena is taller, just on bedding. Onyxia on feeder.

Serena posing. Tail feathers coming in good.

Onyxia mocks Serena. I am doubting the age of her though. They are growing very different to both be 2 weeks.

Tail feather comparison.

 

[embkm]

Breeds do mature at different rates. Leghorns tend to feather out faster I believe... at least my white Leghorns did last year. With my new batch of chicks, I am seeing different feathering rates even among the same breeds. My white frizzles are feathering much faster than the buff/red ones, and they are all feathering faster than the regular cochins.