Cattle

Cattle were domesticated mammals native to Earth. The males were called bulls, the females were called cows (TV: Image of the Fendahl) and the young were called calves. (TV: City of Death, Ghost Light) Clyde Langer once succinctly said — while he was looking after the baby Sky Smith — that "cows eat grass, and they make milk and they go moooo... [and] they also make steak." (TV: Sky) Indeed, Rose Tyler once suggested to the Ninth Doctor that being out of cow's milk was a part of the reason that they often ended up back on Earth. "All the species in the universe," the Doctor replied, "and it has to come out of a cow." (TV: The Empty Child) Many restaurants served cow meat. (TV: The Bells of Saint John)

17th century
In 1648, cattle were among the animals which dwelled in St James's Park in London. (PROSE: The Roundheads)

20th century
Zygons once used body-prints to take the form of cows, as they were allowed to roam freely. As was necessary for the proper operation of body-print technology, the Zygons stored the real cows in their ship. (PROSE: Sting of the Zygons)

In 1913, the Sixth Doctor and Peri Brown witnessed the heavens open up to dump cows on the beaches of Ostend, Belgium. This was cause by a time bomb sending the cows back in time. (AUDIO: Year of the Pig)

Tegan Jovanka lived on a cattle farm when she was young. (AUDIO: Psychodrome)

After materialising in a field, the Second Doctor and companions turned on the TARDIS scanner to see the face of a curious cow staring at them. (TV: The Invasion)

The Third Doctor, John Benton and Mike Yates were attacked by cattle infected with the Sild. In defence, they shot them all, disgusting the Doctor. (PROSE: Harvest of Time)

The Wholeweal community kept cattle. (TV: The Green Death)

While walking near a Buddhist meditation centre in England, Mike Yates walked past a group of cattle. (TV: Planet of the Spiders)

The Fourth Doctor once landed the TARDIS amongst a herd of cattle and facetiously asked them (calling them "ladies") if they had a time scanner, to no avail. (TV: Image of the Fendahl)

The TARDIS materialised in the middle of a herd of cattle again when the Seventh Doctor visited Llanfer Ceiriog. (PROSE: Cat's Cradle: Witch Mark)

While briefly a vampire, Nyssa feasted on the blood of a cow in the fields outside Manchester in the 1990s. (PROSE: Goth Opera)

21st century
The Eighth Doctor also liked to talk to cows. After Destrii and he had defeated the Cybermen, he landed the TARDIS in a pasture. He spoke to the cows, telling them what a great day it was to have saved the universe. Noticing he had lost his frock coat in the battle, Destrii suggested that he would look good in leather (she was wearing a black leather jacket). The Doctor replied that Destrii was once again "charming the locals", indicating that leather came from cattle. (COMIC: The Flood)

Dr Scotus, a veterinarian working near Cardiff, once examined a cow that had begun eating other cows because it had been affected by an alien tapeworm which had come through the rift. (PROSE: Slow Decay)

Later history
When humanity became a space-faring race, they took cows with them to the stars. As Earth's influence spread, cattle were shipped across the galaxy, to planets such as Jadea (PROSE: Placebo Effect) and Sarath. (PROSE: City at World's End)

Bernice Summerfield once experienced a freak time anomaly in which leather shoes were turned back into cows. However, the time anomaly only restored the cows to shortly before they were turned into leather. The floors of the Gigamarket were littered with dead cows. (AUDIO: The Greatest Shop in the Galaxy)

Unknown dates
Maxine Andrews grew up on her father's cattle farm outside Castic City on Insculpo. (AUDIO: The Memory Bank)

Elsewhere
On another occasion, the Eighth Doctor (who was then split into three bodies), Charley Pollard and C'rizz encountered cows in the Garden of Curiosities. This meant that cattle existed not only off-Earth, but in completely different dimensions. One of the three Eighth Doctors noted that cows could become dangerous if they herded together and stampeded. He seemed particularly concerned about cow hooves during a stampede. (AUDIO: Caerdroia)

As an insult
"Cow" was also used as an insult. Clara Oswald once called the TARDIS a "grumpy old cow". (TV: Hide) Martha Jones also called Eve a "scheming cow". (PROSE: The Last Dodo) Before Heather Lake defeated the Mavora Queen, she called it a cow. (COMIC:The Broken Man) Sally Sparrow called Kathy Nightingale a "lying cow" upon realising that Kathy had lied about her age while she examined her grave. (TV: Blink) Bob Hall thought of his landlady in London as an "old cow". (PROSE: The Evil of the Daleks)