Sheep Are An Important Part Of The Global Agricultural Economy

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Sheep are an important part of the global agricultural economy. Domestic sheep provide a wide array of raw materials. Wool is one of the first textiles, although in the late 20th century wool prices began to fall as the result of the popularity and cheap prices for synthetic fabrics . Sheep meat and milk are the earliest staple proteins consumed by human civilization after the transition from hunting and gathering to agriculture. Byproducts from the slaughter of sheep are also of value; sheep tallow can be used in candle and soap making , while sheep bone and cartilage has been used to furnish carved items such as dice and buttons .
Parasitic nematodes cause diseases of major economic importance in sheep .The lungworm , Dictyocaulus filaria , represents one of these nematodes inhabits bronchi and bronchioles and cause parasitic bronchitis (commonly known as ‘husk) particularly in young sheep ( Holzhauer et al., 2011). Dictyocaulus filaria has a direct life cycle, embryonated eggs are coughed up or swallowed and hatch in the small intestine then first-stage larvae are passed in faeces. Under favorable environmental conditions, first-stage larvae moult to second-stage larvae and then infective en-sheathed third-stage larvae that actively move from faeces to herbage and are ingested by the grazing sheep. Following ingestion, third-stage larvae ex-sheath in the small intestine, penetrate the intestinal wall and enter the mesenteric lymph nodes. Here, larvae develop, moult to
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