Performing genetic intensification over livestock is widely used in an effort to boost livestock productivity both for aquatic and terrestrial populations. All this is done even if there’s finite increase in amount of land that’s devoted to raising or grazing livestock.
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This is actually necessary in the growing demand for livestock products regardless of the limited potential in expanding grazing areas.
While it seems to be a modern technology improvement, increasing livestock production and breeds is hardly a new practice at all.
For thousands of years already, livestock were being domesticated and chosen for adaption to a specific climate.
The production system were considerably improved throughout the 17th century wherein there is a rise of selective breeding and professional farming of livestock. In addition to that, with the onset of genetics or the study of variation of the inherited characteristics and heredity in 20th century, there’s been an enormous diversity in livestock that has occurred all around the world.
With the discovery of genomics and molecular genetics, it is now offering bigger potential in breeding livestock to attain specific qualities and desired traits faster than normal. This is the same reason why you were able to see chickens larger than their average size and other animals to have faster reproduction.