Rooster weaker/frailer than other chickens.

[Chuckenman]

I have a presumably leghorn or some sort of mix of it, rooster which is weaker and frailer than the other chickens his age. They're all about 4-5 months. I feed them chicken feed mixed with some cracked corn. It's not that he doesn't eat, infact he eats a lot. His crop gets full, like a ball. Here are pictures -
Leghorn -

Other roosters -

You can even see the difference in the thickness of their legs, the red rooster has thicker legs than the leghorn.

At first when he was small I thought maybe that's how leghorns are and he'll grow some meat on his bones later but he still hasn't. What am I doing wrong?

 

[sourland]

Some birds just mature more slowly and others are born with congenital problems. His comb color is good so I would guess that he is just on the slow scale of maturing.

 

[Chuckenman]

Some birds just mature more slowly and others are born with congenital problems. His comb color is good so I would guess that he is just on the slow scale of maturing.

Hmm, should i give him 1 egg daily just in case for extra nutrition?

 

[Ebony Rose]

He looks healthy to me, good comb & waddle coloring, clear eyes, excellent posture. You can see by the dramatically different sizes of their waddles that he's running a bit slower than your other cockerels on maturing.

 

[Ebony Rose]

Just like people, chickens mature when they mature... It's not something that you can speed up or slow down, it happens when it happens.

 

[MysteryChicken]

They were originally just fed a diet of corn(Your original thread mentioned this), so there maybe abit of a nutritional factor that's at play. Like the lack of certain key amino acids, & proteins needed for proper growth.

Corn is just carbs, which produce fat.

 

[Ebony Rose]

They were originally just fed a diet of corn(Your original thread mentioned this), so there maybe abit of a nutritional factor that's at play. Like the lack of certain key amino acids, & proteins needed for proper growth.

Corn is just carbs, which produce fat.

Explains the look of the feathers, I thought maybe he was due to shed his feathers (molt), as young birds seem to be constantly molting until adulthood (which your flock is fast approaching). He's young enough still to molt out of that look, and with proper nutrition from here on out, he should grow into a fine looking 'man'.
If you decide to offer him treats, keep his nutritional past in mind and only offer high protein goodies that are low in fat. Things like sardines, canned tuna or mackerel are good options that offer a decent amino-acid profile to help feather building and could help him pack on a couple pounds.

 

[MysteryChicken]

Explains the look of the feathers, I thought maybe he was due to shed his feathers (molt), as young birds seem to be constantly molting until adulthood (which your flock is fast approaching). He's young enough still to molt out of that look, and with proper nutrition from here on out, he should grow into a fine looking 'man'.
If you decide to offer him treats, keep his nutritional past in mind and only offer high protein goodies that are low in fat. Things like sardines, canned tuna or mackerel are good options that offer a decent amino-acid profile to help feather building and could help him pack on a couple pounds.

Farmer's Helper Ultrakibblen is full of good stuff, & can be fed mixed into the original feed.

It's a Ration.

It's has almost 30%, & is abit high in fat. But it has alot more of the nutrients needed to help the birds grow.

It's just another option I thought I'd add.

 

[Ebony Rose]

I think the OPs bird is gonna be just fine, and after learning his dietary history, he's really looking quite fine indeed. I'd say they're doing something right