"Americans are some of the biggest egg eaters in the world and they've got a very good opinion of New Zealand as a food source - they know that we farm outdoors and that's our strength."
Half a dozen FRENZ eggs sold for US$5 to US$6 ($6 to $7) in California, he said.
Carrie, who had a business selling wetsuits to the US Navy before he entered the egg trade, said FRENZ began exporting to Hong Kong about 12 years ago and the firm's products were now going to mainland China.
"Eggs are very good protein and the Chinese are looking for good, safe protein with the melamine scare with the milk and all that stuff," he said.
FRENZ could not export directly into mainland China, with product having to travel via Hong Kong due to the lack of a "formal regulated link" on egg exports between the Chinese and New Zealand agricultural ministries.
Carrie, who recently sold his share of the business and left it in Darby's hands, said sales of free range eggs continued to grow in New Zealand and now accounted for more than 20 per cent of egg sales in supermarkets.