Columbia subject headings:
Animal biotechnology--United States.
Bovine somatotropin.
Dairy products industry--Technological innovations--United States.
Dairying--Technological innovations--United States.
Milk trade--Technological innovations--United States.
Milk yield--United States.
Harvard subject headings:
Agricultural biotechnology--United States
Animal biotechnology--United States.
Bovine somatotropin.
Dairying--Technological innovations--United States.
Dairying--United States
Princeton subject headings:
Animal biotechnology--United States.
Bovine somatotropin.
Dairying--Technological innovations--United States.