[kegs]

Hopefully there will be something in this 3-part article by Dr Lokesh Gupta that will help.

http://www.thepoultrysite.com/articles/979/maintaining-egg-shell-quality
http://www.thepoultrysite.com/articles/1003/factors-influencing-shell-quality
http://www.thepoultrysite.com/articles/1004/how-to-improve-shell-quality

[Libby]

These are fantastic!  Thank you so much.  I have printed them off to read in detail, but just the first section explaining about coating of the eggs etc answers so many of my questions. Brilliant.