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Animal rearing




  • ‘Livestock’ are defined, in part, by their end purpose as the production of food, fiber and/or labor.

    The economic value of livestock includes:

    Meat

    the production of a useful form of dietary protein and energy
    Dairy products 
    Mammalian livestock can be used as a source of milk, which can in turn easily be processed into other dairy products, such as yogurtcheesebutter,ice creamkefir, and kumis. Using livestock for this purpose can often yield several times the food energy of slaughtering the animal outright.
    Fiber 
    Livestock produce a range of fiber/textiles. For example, sheep and goats produce wool and mohair; cowsdeer, and sheep skins can be made into leather; and boneshooves and horns of livestock can be used.
    Fertilizer 
    Manure can be spread on fields to increase crop yields. This is an important reason why historically, plant and animal domestication have been intimately linked. Manure is also used to make plaster for walls and floors, and can be used as a fuel for fires. The blood and bone of animals are also used as fertilizer.
    Labor 
    Animals such as horsesdonkey, and yaks can be used for mechanical energy. Prior to steam power, livestock were the only available source of non-human labor. They are still used for this purpose in many places of the world, including ploughing fields, transporting goods, and military functions.
    Land management 
    The grazing of livestock is sometimes used as a way to control weeds and undergrowth. For example, in areas prone to wild fires, goats and sheep are set to graze on dry scrub which removes combustible material and reduces the risk of fires.

    During the history of animal husbandry, many secondary products have arisen in an attempt to increase carcass utilization and reduce waste. For example, animal offal and non-edible parts may be transformed into products such as pet food and fertilizer. In the past, such waste products were sometimes also fed to livestock as well. However, intra-species recycling poses a disease risk, threatening animal and even human health (see bovine spongiform encephalopathy (BSE), scrapie and prion). Due primarily to BSE (mad cow disease), feeding animal scraps to animals has been banned in many countries, at least in regards to ruminants and pigs.

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