I have about 35 hens of ages 8 months to 3 years. I have seen that when I moved the older hens to my place they did not lay for about a month and then BAMM !!! The younger ones have started laying now for about 3 weeks. Now last week we seperated the flock to three different runs, put the lights on timers from 4am till 8 pm and then put a rooster in each run. It took about two days and the results have been very favorable. The hens are laying alot more and everyone seems to be alot happier.
There are some ppl that will say that a rooster will make your hens lay more, some ppl say its all myth. I dont knwo for sure, but it worked for me. Now relize I do live about 4 miles from the Arizona and Mexican line ! The runs are facing south and the sun is coming more from the south as it will untill the end of spring.
I am new to the chicken thing and I have alot of "mature" ppl here tell me to try this or try that ! So far its all good.
Good luck and I hope your hens start to lay. It might be a good thing to bring in a rooster and put him in an ajoining pen just to see if he will get them back on track.
Robby