Description Cattle are large
artiodactyls,
mammals with
cloven hooves, meaning that they walk on two toes, the third and fourth digits. Like all bovid species, they can have horns, which are unbranched and are not shed annually. Coloration varies with breed; common colors are black, white, and red/brown, and some breeds are spotted or have mixed colors. Bulls are larger than cows of the same breed by up to a few hundred kilograms. British Hereford cows, for example, weigh , while the bulls weigh . Cattle breeds vary widely in size; the tallest and heaviest is the
Chianina, where a mature bull may be up to at the shoulder, and may reach in weight. The natural life of domestic cattle is some 25–30 years. Beef cattle go to slaughter at about 18 months, and dairy cows at about five years.
Digestive system changes in response. The reticulum, the smallest compartment, is known as the "honeycomb". The omasum's main function is to absorb water and nutrients from the digestible feed. The abomasum has a similar function to the human stomach. Cattle
regurgitate and re-chew their food in the process of chewing the
cud, like most ruminants. While feeding, cows swallow their food without chewing; it goes into the rumen for storage. Later, the food is regurgitated to the mouth, a mouthful at a time, where the cud is chewed by the molars, grinding down the coarse vegetation to small particles. The cud is then swallowed again and further digested by the micro-organisms in the cow's stomach. A cow's
udder has two pairs of
mammary glands or teats. Farms often use
artificial insemination, the artificial deposition of
semen in the
female's genital tract; this allows farmers to choose from a wide range of bulls to breed their cattle.
Estrus too may be artificially induced to facilitate the process.
Copulation lasts several seconds and consists of a single
pelvic thrust. Cows seek secluded areas for calving. After their first mating, semi-wild
Highland cattle heiffers first give birth at 2 or 3 years of age, and the timing of birth is synchronized with increases in natural food quality. Average calving interval is 391 days, and calving mortality within the first year of life is 5%. Beef calves suckle an average of 5 times per day, spending some 46 minutes suckling. There is a diurnal rhythm in suckling, peaking at roughly 6am, 11:30am, and 7pm. Under natural conditions, calves stay with their mother until weaning at 8 to 11 months. Heiffer and bull calves are equally attached to their mothers in the first few months of life.
Cognition in cows and competitive display in bulls. Cows can
categorize images as familiar and unfamiliar individuals.
Cloned calves from the same donor form subgroups, suggesting that kin discrimination may be a basis of grouping behaviour. Cattle use
visual/brain lateralisation when scanning novel and familiar stimuli. They prefer to view novel stimuli with the left eye (using the right brain hemisphere), but the right eye for familiar stimuli. Individual cattle have also been observed to display different personality traits, such as fearfulness and sociability. A case of multi-purpose
tool use has been documented, where a cow named
Veronika uses different ends of a deck brush to scratch different parts of her body.
Senses Vision is the dominant sense; cattle obtain almost half of their information visually. Being prey animals, cattle evolved to look out for predators almost all around, with eyes that are on the sides of their head rather than the front. This gives them a field of view of 330°, but limits
binocular vision (and therefore
stereopsis) to some 30° to 50°, compared to 140° in humans. Cattle avoid bitter-tasting foods, selecting sweet foods for energy. Their sensitivity to sour-tasting foods helps them to maintain optimal ruminal
pH. Their hearing is better than that of horses, but worse at localising sounds than goats, and much worse than dogs or humans. They can distinguish between live and recorded human speech. Olfaction probably plays a large role in their social life, indicating social and reproductive status. Cattle can tell when other animals are stressed by smelling the alarm chemicals in their urine. Cattle can be trained to recognise conspecific individuals using olfaction only. == Behavior ==