Artificial insemination is the process of forcibly impregnating an animal, often to achieve reproduction to maintain or increase the supply of animals in a farm to keep up with demand. This also includes male animals. In animal agriculture this is often done to cattle, pigs, sheep, turkeys, and chickens. This is done for a variety of reasons including breeding purposes (aka artificial selection) to make breeds more specialized for each particular industry, to avoid injury to animals during natural copulation (especially between animals who have been bred for size such as cattle, and to synchronize births.
Artificial insemination is rape. Just because it is done to a non-human animal does not mean it is less of a crime. When any sentient being has an object forcibly inserted into their vagina and/or anus, especially as a means of impregnation, it is rape. In fact, the restraint device employed in many animal industries is called a “rape rack”. This device was invented by Harry Harlow, an infamous vivisector who also invented the Pit of Despair, which he used to separate baby rhesus macaque monkeys from their mothers to model clinical depression.