This field study is a result of an incestigation at TOYOHOKU-machi in YAMAGUCHI-ken. And especially the main object of the study was to make a sure the opinion of the farmers in their dairy farm management. The obtained results were follows: 1) One the amounts of milk production of dairy cow in one experimental year at 1963, 5000 kg milk produced cow was only 1.6 percents in all investigated cows and 6.7 percents of investigated cows yielded only 2000-3000kg milk per a head. 2) The milk amounts-purchased feeds ratio (Milk-Feed Ratio) was showed at 44 percent by five dairy farms. ....