The most charitable read I can see is

1 - everyone dies 2 - I assume without evidence that death is generally unpleasant and painful 3 - I assume without evidence animals don't have complex internal worlds and desires for things like freedom or long life 4 - I assume the lives animals lead in farms is good 5 - I am a naive utiliarian and see no issues with mere addition/the repugnant conclusion 6 - a quick death does not count negatively in a utiliarian sensw C - therefore we should breed as many animals as we can, kill them whenever convenient as long as they are not old, and this makes the world better.

I do not see how 1 through 3 connect to 4 through 6. And 4 through 6 is just the repugnant conclusion.