Juan Carlos Munoz / Cheese maturing on shelves in traditional dairy, Triglav National Park, Slovenia, October 2014.

Juan Carlos Munoz / Cheesemaker holding a hard cheese, with equipment in the background. Triglav National Park, Slovenia, October 2014.

Terry Whittaker / Person dress as a cow holding a sign which says 'Dump dairy - Save a badger' encouraging a dairy boycott, at anti badger cull march, London 1st June 2013. Editorial use only.

WILLIAM OSBORN / Dairy herd of Jersey cows {Bos taurus} feeding in winter quarters. UK.

Enrique Lopez-Tapia / Sacred Black rats (Rattus rattus) drinking milk at Karni Mata Temple, known as the 'temple of rats', Rajasthan, India, October 2018.

Matthew Maran / Man about to eat a beef burger with bacon, cheese and lettuce, London, UK.

Matthew Maran / Cheddar cheese on slate board

Lynn M. Stone / Saanen dairy goat on pasture with blossoming tree in background. Norfolk, Litchfield County, Connecticut, USA. May.

Ashley Cooper / Milking sheep on a farm in Lazonby, Cumbria, England, UK, August.

Ashley Cooper / Dairy cow with a full udder

Ashley Cooper / Box of free range eggs of varying colour from chickens of different breeds.

Matthew Maran / Slurry from the Clinton Devon Estate's Home Farm dairy, stored in 20,000-cubic-metre slurry lagoon until it is needed for fertiliser on the farm. Devon, England, UK, May.

Matthew Maran / Dairy cows with Newton Poppleford in the background, Devon, England, UK, February 2017.

Matthew Maran / Farmer spreading slurry on organic dairy land. Slurry collected from the cattle herd is recycled as natural fertiliser, Devon, England, UK, July.

Matthew Maran / Dairy cows on organic farm feeding on pellets during milking, East Devon, England, UK, July.

Loic Poidevin / Lacaune sheep, which produce milk for Roquefort Cheese, Aveyron, France, May.

Pat Tuson / Milk delivered in plastic bottles to doorstep, Highbury, London Borough of Islington England UK, April 2015.

Will Watson / Holstein Cows on water bed in modern automated milking parlour, Herefordshire, England.

Will Watson / Holstein Cow attached to automated milking machine, Herefordshire, England, UK, February.

Will Watson / Holstein Cow attached to automated milking machine, Herefordshire, England, UK, February.

Will Watson / Holstein Cows feeding in modern automated milking parlour, farmer, Herefordshire, England.

Will Watson / Holstein Cow in modern automated milking parlour, farmer, Herefordshire, England.

Kerstin Hinze / Edible dormouse (Glis glis) drinking milk from a saucer, captive

Brent Stephenson / Fresian-Jersey cross cows (Bos taurus) in dairy parlour with man, Ashley Clinton, Hawkes Bay, New Zealand, September 2011, Model released.

Brent Stephenson / Dairy farmer washing down the dairy shed after milking, Ashley Clinton, Hawkes Bay, New Zealand, September, Model released.

Juan Carlos Munoz / Organic cheese farm, with cheeses maturing on shelves Cadrg, Julian Alps, Tolmin, Slovenia, October.

Juan Carlos Munoz / Organic cheese farm, with cheeses maturing on shelves Cadrg, Julian Alps, Tolmin, Slovenia, October.

Juan Carlos Munoz / Man working on organic cheese farm, Cadrg, Julian Alps, Tolmin, Slovenia, October 2014.

Lynn M Stone / Guernsey dairy cow, Granby, Connecticut, USA.

Kirkendall-Spring / Making yak cheese by placing tree branches and yak milk in a bucket. Yak herders camp near the Soi Yaksa Valley, along the Jhomolhari trek. Bhutan, October 2014.

Pascal Tordeux / Production of Beaufort cheese, Bourg-Saint-Maurice, Savoie, Rhone-Alpes, France, May 2014.

Pascal Tordeux / Production of Beaufort cheese, Bourg-Saint-Maurice, Savoie, Rhone-Alpes, France, May 2014.

Pascal Tordeux / Cheesemaker Mr Perraudat in cellar with Beaufort cheeses, Bourg-Saint-Maurice, Savoie, Rhone-Alpes, France, May 2014.

Pascal Tordeux / Beaufort cheeses in cellar, Bourg-Saint-Maurice, Savoie, Rhone-Alpes, France, May 2014.

Pascal Tordeux / Beaufort cheeses in cellar. 20,000 cheeses are kept in 26 cellars here, and the aging process takes 5 months. Bourg-Saint-Maurice, Savoie, Rhone-Alpes, France, May 2014.

Pascal Tordeux / Farmer with milk to be sent to the Bourg-Saint-Maurice dairy for Beaufort cheese, Savoie, Rhone-Alpes, France, May 2014.

Pascal Tordeux / Farmer milking Abondance cows, the milk is used in the production of Beaufort cheese. Beaufort district, near Bourg-Saint-Maurice, Rhone-Alpes, France, May 2014.

Pascal Tordeux / Farmer milking Abondance cow, the milk is used in the production of Beaufort cheese. Beaufort district, near Bourg-Saint-Maurice, Rhone-Alpes, France, May 2014.

Pascal Tordeux / Farmer sitting with dog, milking Abondance cows. The milk is used in the production of Beaufort cheese. Beaufort district, near Bourg-Saint-Maurice, Rhone-Alpes, France, May 2014.

Steve O. Taylor (GHF) / Village elder resting under acacia tree with bottle of milk, rural Chad, 2002-2003.

Steve O. Taylor (GHF) / Village elder resting under acacia tree with bottle of milk, rural Chad, 2002-2003.

Bernard Castelein / Vendor with Yak butter during the Torgya festival. Galdan Namge Lhatse Monastery, Tawang, Arunachal Pradesh, India. January 2014.

Bernard Castelein / Vender with Yak butter during the Torgya festival. Galdan Namge Lhatse Monastery, Tawang, Arunachal Pradesh, India. January 2014.

Pal Hermansen / Old, rare Norwegian cow breeds Sided Tronder and Nordland (STN) cattle, a dairy cow, Norway, July.

Zoltan Nagy / Traditional Transylvanian sheep cheese. Gurghiu Mountains, Romania, July.

Pat Tuson / Two fullglass milk bottles with red tops standing on wall

Will Watson / Holstein dairy cows drinking from water trough, Herefordshire, England, May.

Will Watson / Holstein dairy cow chewing the cud, Herefordshire, England, June.

Will Watson / Low angle view of Holstein dairy cow on pasture, Herefordshire, England, June

Lynn M Stone / Alpine Goat (a dairy breed) nanny goat in pasture, Poplar Grove, Illinois, USA

Lynn M Stone / Alpine Goat (dairy breed) Poplar Grove, Illinois, USA

Lynn M Stone / Alpine Goat (a dairy breed) nanny goat in pasture, Poplar Grove, Illinois, USA.

Lynn M Stone / Alpine Goat (a dairy breed) nanny goat in pasture, Poplar Grove, Illinois, USA. Non-exclusive

Lynn M Stone / Alpine Goats (a dairy breed) nanny goats in pasture, Poplar Grove, Illinois, USA. Non-exlusive

Lynn M Stone / Toggenburg dairy goat low angle shot, East Troy, Wisconsin, USA

Lynn M Stone / Owner milking an Oberhasli dairy nanny goat on a portable aluminum milking stand, East Troy, Wisconsin, USA

Lynn M Stone / Oberhasli dairy goat, nanny goat sniffing Wild Mustard (Brassica) blooms in spring pasture, East Troy, Wisconsin, USA

Lynn M Stone / Alpine Goat (dairy breed) Poplar Grove, Illinois, USA

Lynn M Stone / Toggenburg dairy goat in spring pasture with Oberhasli dairy goat kid and nanny goat in background, East Troy, Wisconsin, USA

Lynn M Stone / Toggenburg dairy goat in spring pasture, East Troy, Wisconsin, USA

Lynn M Stone / Oberhasli dairy goats, nanny goats in spring pasture, nanny goat in foreground has been clipped for showing in competition ring, East Troy, Wisconsin, USA

Lynn M Stone / Oberhasli dairy goats, nanny goat and mixed-breed kids in spring pasture, East Troy, Wisconsin, USA

Lynn M Stone / Oberhasli dairy goat kid in spring pasture, East Troy, Wisconsin, USA

Lynn M Stone / Alpine Goats (a dairy breed) nanny goats butting heads in pasture, Poplar Grove, Illinois, USA

Colin Monteath / Domestic Cattle (Bos taurus) dairy cows grazing near Twizel, Mackenzie Country, New Zealand

Colin Monteath / Domestic Cattle (Bos taurus) dairy cows grazing under irrigation system near Lauder, Central Otago, New Zealand

Gary K. Smith / Milk tanker filling up at small dairy unit, Binham Village, Norfolk, UK

LYNN M. STONE / Holstein Cow in front of historic dairy barn and cupola on at Liberty Hill Farm, Rochester, Vermont, USA, October.

LYNN M. STONE / Holstein Cows in front of historic dairy barn and cupola on at Liberty Hill Farm, Rochester, Vermont, USA, October.

Gary K. Smith / Friesian / Holstein dairy cows on pasture with Binham Priory in background. Norfolk, UK, May.

Gary K. Smith / Friesian / Holstein dairy cows on pasture. Norfolk, UK, May.

Paul Hobson / Barn Owl (Tyto alba) perched on post outside cowshed, with British Friesian cow behind, captive, UK, November

Ernie Janes / Domestic cattle, Jersey dairy herd gather for afternoon milking, UK, June 2005

Ernie Janes / Domestic cattle, friesian dairy calf feeding in rearing shed, UK, November 2007

Ernie Janes / Domestic cattle, feeding milk to five friesian dairy calves in rearing shed, UK, November 2007

Ernie Janes / Domestic cattle, Friesian dairy herd grazing on summer grass with Binham Priory in the background, Norfolk, UK, May 2008

Ernie Janes / Domestic cattle, feeding milk to three friesian dairy calves in rearing shed, UK, November 2007

Ernie Janes / Domestic cattle, feeding milk to five friesian dairy calves in rearing shed, UK, November 2007

Ernie Janes / Domestic cattle, close up of nose of Jersey dairy cow under strand of barbed wire, in summer pasture, UK, June 2005

Ernie Janes / Ayrshire dairy herd of Domestic cattle grazing in field with village in background, Hambleden, Bucks, UK, October 2006

Ernie Janes / Domestic cattle, Jersey dairy cow in summer pasture, UK, June 2005

Ernie Janes / Ayrshire dairy herd of Domestic cattle grazing in field with barn and woodland in background, Hambleden, Bucks, UK, October 2006

Ernie Janes / Domestic cattle, Jersey dairy cow in summer pasture, UK, June 2005

Ernie Janes / Ayrshire dairy herd of Domestic cattle grazing in field with woodland in background, Hambleden, Bucks, UK, October 2006

Ernie Janes / Domestic cattle, Jersey dairy herd in summer pasture, UK, June 2005

Ernie Janes / Domestic cattle, Jersey dairy cows in summer pasture, UK, June 2005

Ernie Janes / Domestic cattle, bottle feeding friesian dairy calf in rearing shed, UK, November 2007

Ernie Janes / Domestic cattle close up, from Friesian dairy herd grazing on summer grass with Binham Priory in the background, Norfolk, UK, May 2008

Ernie Janes / Domestic cattle, Jersey dairy cows in summer pasture, UK, June 2005

Ernie Janes / Domestic cattle, Jersey dairy herd in summer pasture, UK, June 2005

Ernie Janes / Domestic cattle, Jersey dairy herd in summer pasture, UK, June 2005

LYNN M. STONE / Guernsey Cows in pasture near rural road and farm buildings, October, Sharon Springs, New York, USA

LYNN M. STONE / Guernsey Cow lying in autumn pasture while chewing her cud, Connecticut, USA

LYNN M. STONE / Guernsey cow chewing cud, in pasture, backed by Sugar Maple tree, autumn, Connecticut, USA

LYNN M. STONE / Holstein dairy cow lying down, autumn, Connecticut, USA,