Laying poultry farm in Hokkaido, small-scale farm was a common management structure about 5 to 10 birds feeding until 1950s.
Once in the 1960s, the farmers of less than 50 birds per farm was the mainstream. However, going out of business of small-scale breeding scale farmer poultry and the scale of the poultry farmers of the remaining proceeds, and the breeding production of eggs was significantly increased.
In this way, to expand trading firms poultry share, poultry farmers and poultry companies that have rallied Hokuren is now located in the dwindling of business trend.
In this paper, we clarify the background and factors that gave birth to such a structure, it is a challenge to elucidate the direction of poultry promotion that lineage agricultural cooperatives led.
In conclusion, it is also seen new developments of large-scale poultry of Hokkaido, that egg supply in Hokkaido by agricultural cooperatives represented by Hokuren is collateral, eggs relief of food and that is a daily food It has been pointed out that it is extremely important for safety.