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Both conventional and organic layer feeds will meet the nutritional requirements of a layer hen. The organic feed will have been produced organically though, without synthetic fertilizers, herbicides and pesticides, nor genetically modified stock. Such farming practices are important to some people, as they feel these practices are more ecologically sound than growing crops with the assistance of man-made chemicals.
More than likely any organic feed that you buy will have plant based proteins and not include any animal based proteins. The national organic standards prohibit feeding livestock poultry and mammalian based feedstocks. Which leaves only fish meal that can impart an off flavor to the eggs. Yet most plant based proteins are deficient in two essential amino acids, methionine and lysine, these are usually added into organic feed by the addition of kelp meal or other non-standard feedstocks which can be expensive and add to the cost of the feed.
If you buy a conventional feed with only plant proteins, then synthetic amino acids are added. Conventional feeds with animal based protein have all the essential amino acids and do not require amino acid supplements.
Nutritionally there is little difference between the organic and conventional feed. Regardless of other opinions here, organic production is not necessarily about food purity. The benefits to organic production are that such products are more environmentally friendly, that livestock are raised under more humane conditions, and that the food produced wasn't intentionally exposed to man-made chemicals such as synthetic fertilizers, herbicides, pesticides, antibiotics, hormones, or made from genetically modified crops.
There is nothing magical in layer feed other than the basic nutritional requirements (proteins, carbohydrates, fats, vitamins, and minerals) required for a laying hen. Your hens will do fine on either conventional or organic layer feed.