Insisting on quality, Tsai Nan's farm adopted organic cultivation. His milk was completely pure and was regularly bought by organic food distributors like the Homemaker's Union and Foundation. He had created a market niche and successfully built the "Fourways Milk" brand.
在堅持品質下，蔡南牧場採取有機養殖，生乳十分鮮純，而被「主婦聯盟」等有機飲食的通路商定期採購，做出了市場區隔，也成功打開「四方鮮乳」品牌。