I know that crossing two different breeds is supposed to produce a more 'vigorous' and healthy bird. My question is, will it also improve the egg laying ability of the offspring? For example, my Speckled Sussex and New Hampshire are rated as 'Very Good' in the production department. If I crossed these two breeds, would you expect the offspring to be 'Excellent" layers? Or just 'Very Good'? Any insights and personal experiences are welcome. Thanks!