Line-breeding is a term used in animal husbandry to describe a breeding strategy that involves mating animals within the same bloodline. Other terms that are commonly used include inbreeding, selective breeding, breeding up, and family breeding. These techniques are widely used in livestock production to enhance the traits of animals that are desirable, such as increased size, growth rate, or resistance to disease. However, there are potential drawbacks to this approach, as it can lead to a reduction in genetic diversity and increased susceptibility to genetic defects. In summary, line-breeding is just one of several methods of breeding animals that are commonly used in animal husbandry, and it has its advantages and disadvantages.