Revisiting Egg Issue

[RocketDog1]

Egg laying problems seem to be a very common issue. I guess I’m not alone.
Last year I posted about my 2 year old barred rock that was constantly laying rubbery eggs after being a top-notch producer previously. Now she has stopped laying completely. Her sister has also now stopped laying. Both birds go into the nesting boxes daily, sit for an hour or so, and then emerge without laying. Both had been prolific layers in the past. Neither hen shows any negative symptoms- combs & waddles are bright and healthy, appetites are normal, and all behaviors seem fine. Their diet consists of 2/3 layer mash and 1/3 Purina Layeena. We give them treats of kale, broccoli, corn, etc., mixed with ground eggshells and sometimes high calcium yogurt.
Just not sure what else I can do short of taking them to a vet with a $75 per bird fee.
We’d like to add more birds to our newly expanded coop & run but we’re not sure if our current hens might have something that could be passed on to new arrivals.
Any ideas?
Thank you

 

[aart]

Was the rubbery egg thing from last year resolved?
Are these your only 2 birds?

Could be the change in coop and run threw them off?
Chicken don't like change...how long ago was coop expanded?

Personally I'd cut out all the extras and only give the feed.
Or go to a higher protein feed and still minimize the extras.

Where in this world are you located?
Climate can be a factor.
Please add your general geographical location to your profile.
It's easy to do, then it's always there!

 

[RocketDog1]

The rubbery egg issue never improved- she finally quit laying altogether. Then her sister didn’t restart laying after the winter.
Yes, these are our only birds. We want to add 4 more but are nervous about new birds contracting something from these birds. Just not sure if illness is the problem.
The run and coop were remodeled over the last two weeks, long after the egg laying stopped.
We’ll try going back to just layer mash and stop with all the supplements.
We’re in Sonoma, CA, just north of San Francisco. Very mild climate. I’ll go in and fill out my profile.
Thanks for the advice.