I know Casey, it is a shame, but until recently the 'spent' by age was 72 weeks, but the more modern hybrids can now lay well for another 8 weeks!!! wow!
also bear in mind that info is for the commercial people, so much of it won't matter to us.
Interesting they say that some of the hybrids only eat 111gms of feed a day. Try telling that to our girls!!!! lol
People are always going on about this hybrid and that, but if you look through that website properly, you will see that Hendrix Genetics have virtually taken over the hybrid world!