sherdfan
selling feed additives to the poultry industry...once again reinforcing the old saying "Nothing happens until somebody sells something."
I would begin by using literature that is produced by your own company. You do not say if you are a rep or an employee but they have to have some type of written information about their products.
Next, I would research the poultry industry and see what the "experts" have to say regarding feed additives. They will certainly have an opinion regarding what additives they feel are best and what ingredients they contain. Then I would see what ingredients your particular additive contains and highlight that in my presentation.
As for sales techniques, there are a variety of sources. Look carefully at each one, take what best suits your way of speaking and presentation from each of them and use what you find.
I hope you will notice that I began by talking about learning as much about your industry and product as possible, then about selling techniques.
If you and I went to a hardware store and bought one of those leather belts that hold a hammer, nails, t-square, etc. it would not make us a carpenter. They are simply tools. It is the use of the tools that make us a craftsman. Your knowledge of product is your tool. Learn that first, then use great selling skills to supplement your tool kit.