Authentic ranch is framed by the Snowy Range Mountains, pasturelands with real cattle, and cabins dotting the shore along the Little Laramie River.

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Their guest ranches range from rustic outposts where visitors herd cattle, to refined enclaves that could be displaced English manors.

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For fund investors, good bets are the Market Vectors Agribusiness ETF (MOO), whose top holdings include ag biotech giants Monsanto and Syngenta and tractormaker Deere, and the Invesco Powershares Agricultural ETF (DBA), which invests in a range of commodities futures, from Kansas wheat to feeder cattle to soybeans, cocoa and corn.

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Culling has been used to control infectious diseases in a range of species from deer to badgers, wolves to domestic cattle.

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It is found naturally in a wide range of animal species, including horses, sheep, goats and cattle.

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The traditional cattle-ranchers, squeezed out by spiralling land values along the front range of the Rockies, are much more pragmatic about growth than the new arrivals.

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By contrast, the cattle marching into a typical slaughterhouse have spent as little as six months on the range and four months in packed feedlots.

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