http://www.abs.gov.au/ausstats/[email protected]/Lookup/by%20Subject/...
Also
http://www.grub.com.au/News/FoodFacts/post/2013/02/06/In-Aus...
Unsurprisingly, when you concatenate these three things together, including both wool farming and wheat, two of the country's major exports, it does rise higher than cotton farming. It's like saying if you put the US, Mexico, and Brazil together, they're bigger than Canada.
Also, from your second link: To understand what’s going on we need to look more closely at the numbers.There are currently about 720,000 head of cattle in Australia’s feedlots, out of a national cattle herd of 28.5 million. This represents about 3%. So, however you look at it, the vast majority of cattle in Australia are grass-fed. <- This is the finishing I was talking about earlier, and the statement that the vast majority of beef doesn't use grazing is wrong.