求翻译：2009年我国饲料工业总产值达到4713.2亿元，其中添加剂产值占319.9亿元，畜牧业精饲料年缺口2千万吨，牧草缺口2.8亿吨。是什么意思？

China's feed industry output value reached 471.32 billion yuan in 2009, which the additive output value accounted for 31.99 billion yuan, 20 million tons of livestock concentrated feed year gap grass gap of 280 million tons.

2009 my feed industrial output value reached $471.32 billion, of which additives output accounted for 31.99 billion, and $20 million shortfall in livestock feed concentrates, forage gaps 280 million tons tons.

In 2009 our country feed gross value of industrial output achieved 471,320,000,000 Yuan, in which chemical additive output value accounts for 31,990,000,000 Yuan, the animal husbandry concentrated feed year gap 20,000,000 tons, the forage grass gap 280,000,000 tons.

2009 Chinese feed industrial output value reached $ 471.32 billion, additive production accounted for $ 31.99 billion, concentrated year gap of 20 million tons of animal husbandry, forage gap 280 million tons.