First egg, no shell??

[Shadrach]

Don't mix calcium into anything at all. You don't know what dosage they need and no effort has been given above to determine how much calcium your girls have been getting.

It is best to offer calcium in a side dish. Pullets/hens know when their body is calcium deficient and they'll naturally munch on any oyster shell or other calcium supplement you offer. Any that don't need it will avoid it. You can do this lifelong with hens.

Non-layers (younger pullets, cockerels, etc) definitely shouldn't be force-fed additional calcium.

Not true. Most layer feeds are between 4% and 5% calcium.
Take say 100 grams of feed per day for an average hen.
At 5% this is 5 grams per day.
Reduce this by one third roughly because of the scratch to feed ratio the OP mentions you get roughly 3 grams per day being eaten by the hen.
A 2 gram supplement that I suggest would make up the shortfall with zero risk over the time period mentioned.
As I mentioned earlier, once the scratch is not being fed the hens should get the correct amount. In the meantime 2 grams extra is not going to do any harm.

 

[TooCheep]

Letting them eat oyster shell/egg shell/etc. on the side is both a good long-term method and will let them eat as much as they need in the short run. They will be able to adjust up or down as needed with no attempt to guess what their bodies need. It also does not presume that all of the pullets are at the same stage and need exactly the same supplements. It is still best to feed calcium on the side.

 

[Shadrach]

Letting them eat oyster shell/egg shell/etc. on the side is both a good long-term method and will let them eat as much as they need in the short run. They will be able to adjust up or down as needed with no attempt to guess what their bodies need. It also does not presume that all of the pullets are at the same stage and need exactly the same supplements. It is still best to feed calcium on the side.

I would agree in principle but feeds are designed with a particular calcium requirement in mind. So if a hen eats a particular feed the calcium intake is already regulated by the quantity she eats. They don't pick out the feed that isn't calcium.
Also, not all hens will use calcium offered free range.
If the hen is free ranging then there is a lot of merit in the points you make and here where they free range they do tend to eat what their body requires and the commercial feed is often backup.
For the short term, if the shell less egg is in fact a calcium deficiency the extra 2 grams over two weeks will help to replenish the hens calcium store (hens build up a store of calcium in their legs and use this when there is a shortage of calcium in what they eat. It's how hens get osteoporosis by depleting this store)
I have not suggested not to feed calcium on the side, but in the short term if there is a dietary problem then a short term calcium boost would seem reasonable.

 

[Willow Whispers]

well I heard the egg song and went to investigate only to find this beauty waiting for me. Yay! A normal egg!!!

 

[momoftwinsinwi]

I've also had a few weird shaped eggs, soft shell, etc....I have a small feeder with oyster shells hung in the run full at all times

 

[aart]

First egg soft and all the panic?? SMH.
Really it's pretty common.

 

[Yorkshiregal]

well I heard the egg song and went to investigate only to find this beauty waiting for me. Yay! A normal egg!!!View attachment 1875209

I had the same problem. My first 2 eggs had no shell. Just like your pic. I put some oyster shell down for them also. I’ve been getting 4 regular eggs every day for the past couple of weeks. I should be getting maybe 7 when my hens catch up. They were all double yokers the first couple of weeks too so be prepared for that. A few had funny looking yolks but it’s probably normal. It’s super exciting times!