Best type of feed for broilers

[Kitarist]

So i was looking at some broiler feed and finally found one that is all natural feed without any additives etc...

Now it comes in 2 sets:

Broiler Starter: Which as 21% protein etc...
Broiler Finisher: Which has 19% protein etc...

But it says to use Broiler starter only for 2 weeks then switch to Broiler finisher.

I did mail them and ask if i could use Starter for the whole run and they did say i could but i would need to start mixing it with corn in the 5th week.

But wouldnt higher protein make chicks grow faster and be more efficient in the first few weeks? So the first option would be better?

So what do you think what would give the best perfomance?

Thanks!!!

 

[Duckopolis]

Starter: 0-6 weeks
Finisher: 6-16 weeks
Later: 16- egg laying span