helpful indeed, the smart author proved that the membrane that contains the yoke can be weaker or stronger depending exclusively on the hens individual dna and its diet, all birds that come from the same parents can show more of their moms genetic traits or its dad's genetic traits even if they all look the same so because every bird/hen is an individual and unique they may be more prone to broken yokes just because of their individuality and even a different diet might not help all that much. so if you desire eggs that all have great looking yokes and whites you need to begin with breeds of healthy chickens that are known to lay those types of desirable eggs, and even then the diet that they are fed will also be a factor of their egg quality, and even then some birds wont have the best parts/genes from both of her parents and might be sickly or lay weird eggsI'm not sure, but I did find this paper on the topic:
http://jeb.biologists.org/cgi/reprint/13/1/41.pdf
It's just one study, but what they found is interesting.
