Changes in dairy husbandry methods during the last 25 years.
D000821:Animal Feed; D000818:Animals; D002417:Cattle; D003365:Costs and Cost Analysis; D003612:Dairying; D004467:Economics; D004739:England; D005527:Food, Fortified; D006799:Housing, Animal; D007315:Insemination, Artificial; D008722:Methods; D008892:Milk; D006109:Poaceae; D011996:Records; D012722:Sewage; D012820:Silage; D014508:Urea; D014852:Wales
D012722:Sewage; D014508:Urea