Rockinbar,

Where did you get the idea that China is an exporter of beef to the US? They are potentially a major market. http://www.wsj.com/articles/u-s-bee...-premier-statement-on-imports-1474494579

The 4 major beef processors (Tyson, Cargill, JBS, and National Beef) control the price they are going to pay for cattle with the importation of beef or live cattle from Canada and Mexico.
http://www.ers.usda.gov/amber-waves/2012-september/how-much-us-meat.aspx#.V_ZtvPQvThU
The data is a few years old but is still representative. If a rancher isn't involved with direct marketing of their beef to the consumer they will always be at the mercy of the prices set by the big meatpackers.