An avian influenza outbreak and rising feed costs are behind a shortage of chicken eggs in Japan that has led to rising prices for popular restaurant items including beef bowl dishes as well as the household staple mayonnaise. Poultry farmers were already reducing the number of egg-laying hens in response to soaring feed prices fueled by the war in Ukraine when bird flu hit Japan late last year. The increase in chicken culls has made the supply of eggs unstable, causing wholesale prices to skyrocket. Tetsuro Nomura, the minister of agriculture, forestry and fisheries, said last week that bird flu cases had been detected in 25 of the country's 47 prefectures since October, and 14.78 million birds had been culled as of Friday morning last week. As of Wednesday, the wholesale price of medium-size eggs was 335 JPY ($2.49) per kilogram in Tokyo, 81% higher than the same day last year, according to statistics from egg seller JA. Z-Tamago, a unit of the National Federation of Agricultural Cooperative Associations. That exceeds the average wholesale price for January -- the last full month for which data are available -- which averaged 280 yen, the highest level since 1986. [
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