Category Social Sciences

Machinery has made it possible for the work of a dozen farm workers to be done twice as quickly by one worker. There are fewer people working on the land in developed countries than ever before. Machinery exacts a price from the environment as well, as hedges and ditches are removed to allow larger machines to work the enormous fields. Crops have been bred for the machine age, too. They need to ripen together, not over a period of time, so that machinery can harvest them in one operation.

Farm machinery, mechanical devices, including tractors and implements, used in farming to save labour. Farm machines include a great variety of devices with a wide range of complexity: from simple hand-held implements used since prehistoric times to the complex harvesters of modern mechanized agriculture.

The operations of farming for which machines are used are diverse. For crop production they include handling of residues from previous crops; primary and secondary tillage of the soil; fertilizer distribution and application; seeding, planting, and transplanting; cultivation; pest control; harvesting; transportation; storage; premarketing processing; drainage; irrigation and erosion control; and water conservation. Livestock production, which not so long ago depended primarily on the pitchfork and scoop shovel, now uses many complicated and highly sophisticated machines for handling water, feed, bedding, and manure, as well as for the many special operations involved in producing milk and eggs.

In the early 19th century, animals were the chief source of power in farming. Later in the century, steam power gained in importance. During World War gasoline- (petrol-) powered tractors became common, and diesel engines later became prevalent. In the developed countries, the number of farm workers has steadily declined in the 20th century, while farm production has increased because of the use of machinery.

Fishing in the open seas is expensive, dangerous and increasingly difficult as some fish stocks diminish. Fish farming involves using lakes, rivers and netted-off coastal areas to raise fish that can be harvested more easily. Freshwater fish and shellfish have been most success-fully farmed in this way. Many deep-sea fish require conditions that are impossible to recreate in managed waters.

Fish farming involves raising fish commercially in tanks or enclosures such as fish ponds, usually for food. It is the principal form of aquaculture, while other methods may fall under mariculture. A facility that releases juvenile fish into the wild for recreational fishing or supplement a species’ natural numbers is generally referred to as a fish hatchery. Worldwide, the most important fish species produced in fish farming are carp, tilapia, salmon, and catfish.

Demand is increasing for fish and fish protein, which has resulted in widespread overfishing in wild fisheries. China provides 62% of the world’s farmed fish. As of 2016, more than 50% of seafood was produced by aquaculture.

Farming carnivorous fish, such as salmon, does not always reduce pressure on wild fisheries. Carnivorous farmed fish are usually fed fishmeal and fish oil extracted from wild forage fish. The 2008 global returns for fish farming recorded by the totaled 33.8 million tons worth about $US 60 billion.

Livestock is farmed chiefly to supply foods such as meat, eggs and milk, but also for leather, fur and wool. Animal by-products may also include glue, gelatin and fertilizer.

The term “livestock” refers to any domesticated, land-living animal that is raised to provide resources like meat, milk, eggs, and feathers, or to provide services like transportation or cultivation assistance. Buffalo, cows, ducks, goats, and horses are just a few examples of animals that fall into this broad category.

Livestock are raised around the globe, both on small scales—generally for subsistence or local trade—and in massive industrial operations supplying international markets. The sheer mass of these animals is hard to fathom: The combined weight of cattle, chickens, and pigs exceeds the weight of all wild animals and humans combined.

22.8 billion Chickens

Chickens are far and away the most numerous type of livestock on the planet. There are about 135 chickens for every cow—and three for every human.

Wild chickens are believed to have originated in northern China, and were eventually domesticated in Southeast Asia more than 5,000 years ago. China remains the world’s leading producer of chickens, claiming over 20 percent of the global chicken supply. However, the birds are now raised on every continent except Antarctica, where they are banned. Globally, chicken consumption is on the rise, outpacing the growth in consumption of other meats, like beef or pork. But growing demand for eggs has also contributed to chickens’ dominance.

1.5 billion Cattle

Cattle are the second most common livestock animal. Their domestication is thought to have occurred roughly 10,500 years ago, in what is now considered the Middle East.

Today, these animals are especially prevalent in South America, where they’re primarily raised for meat, and in India, where the animals are conversely valued for the dairy products they produce. Cows are revered in Hinduism, India’s majority religion, and most Indian states have regulation prohibiting, or at least regulating, the slaughter of cattle.

1.2 billion Sheep

Sheep are believed to be one of the first domesticated animals, and are common throughout the Old World. They’re especially prevalent in northeastern China, Central Asia, and North Africa, but are also raised intensively in New Zealand and Australia.

Although New Zealand is famous for having more resident sheep than people (with roughly six sheep for every person), it actually ranks third in terms of sheep per capita. Mongolia has a 10:1 ratio of sheep to humans, while the Falkland Islands, a British territory off the eastern coast of Argentina, boast more than 200 sheep per capita.

967 million pigs 

The sixth most common livestock animal is the humble pig, which is descended from the significantly more formidable wild boar. Pig production is localized to a few high-intensity areas in China, northern Europe, and the American Midwest. Nearly half of the world’s pigs are raised in China alone.

Excluding areas where pork is not customarily consumed—including North Africa, the Middle East, and other predominately Muslim regions—pig production is on the rise.

From 1960 to 2010, the number of pigs on the planet grew by 250 percent, while the size of individual pigs nearly doubled. This growth is attributed to increased demand for animal protein in the regions where pigs are already consumed.