avg american is recommended 6 oz grain per day, let’s be idiotproof and say it’s 8 oz, meaning the avg person eats 182.5 lbs of grain a year

.538 tons available per Chinese person
.083 tons are directly eaten per person
.455 tons left per person annually

the Feed Conversion Ratio range for pork is 2.7-5.0
assuming worst case scenario at 5, the remaining .455 tons, since 57% of a pig is edible meat, results in 114 lbs of pork per person annually

The average Chinese eats 50-52 kg pork per year, so this means China is completely self sufficient in food for meat production (apart from beef/mutton)