Short answers, pulled from the story.
The word livestock was first used between 1650 and 1660, formed as a compound of the words "live" and "stock." Over the nineteenth century, its meaning broadened while the word "cattle" narrowed to refer specifically to domesticated bovines.
Dogs were among the earliest, appearing in Europe and the Far East from about fifteen thousand years ago. Goats and sheep were domesticated between eleven thousand and five thousand years ago in Southwest Asia. Pigs followed by around 8,500 BC in the Near East and 6,000 BC in China, and horses were domesticated around 4,000 BC.
The IPCC estimated that agriculture as a whole accounted for about ten to twelve percent of global anthropogenic greenhouse gas emissions in 2005 and in 2010. Livestock enteric methane alone accounts for thirty percent of the planet's overall methane emissions, and livestock are responsible for thirty-four percent of all human-related nitrous oxide emissions.
An estimated seventy-four percent of livestock worldwide are raised in factory farms, characterized by densely confined animals. Despite widespread opposition to intensive farming in consumer surveys, a majority of respondents are unaware of routine practices such as beak trimming or the separation of calves from their mothers.
The value of global livestock production in 2013 was estimated at 883 billion dollars, in constant 2005-2006 dollars. That figure does not include the broader economic impact through downstream industries such as abattoirs, milk processors, and retailers, or upstream industries such as feed producers and equipment manufacturers.
Deadstock is defined as animals that have died before slaughter, sometimes from illness or disease, in contrast to live livestock. In many countries, including Canada, it is illegal to sell or process meat from dead animals for human consumption.