We produce ~77 million tonnes of beef, using (at the 1:25 ratio) 1925 million tonnes of feed.
Africa currently imports most of it's grains, let's take a generous estimate of ~75 million tonnes of grain. Add another 25 million tonnes for their local production.
And we're still off by a factor of 19x.
Food production capacity is a non-issue. Availability to the people who need it is the real problem, and that is primarily about our willingness to aid those who need it and make some personal sacrifices for the greater good.
We've got a long, long, long way to go before half the world is starving to death.