Page 125 - One Million Things: Animal Life - The Incredible Visual Guide

Hereford bull

CATTLE
Various types of wild cattle,
including European aurochs, were
first domesticated 10,000 years ago.
Cattle are used for milk, meat, and
leather. More recent selective
breeding has produced some
breeds that excel at milk
production, and others that are
primarily farmed for meat.

Wild boar

GLOWING MICE
Genetic modification involves taking specific
genes (instructions for a particular characteristic)
from one organism and introducing them into
Young
another. For example, a jellyfish gene introduced
farm pigs
into mice makes them glow. Scientists hope
these genetic-engineering techniques will aid
research into human diseases. PIGS
Over thousands of years, pigs have breeding has produced animals
been domesticated in different that are less hairy and less
places around the world at least aggressive than their wild boar
seven times, probably because ancestors. Domestic pigs are used
Mice glow green mainly for meat, but some dwarf
under blue or wild boar are very adaptable and
ultraviolet light are easy to look after. Selective breeds are popular as pets.

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