If you like experimenting with proven practices, try separating a few birds to give them 3/4 of their regular water with 1/4 of seawater and see the difference. You will see that they eat less because that diluted seawater contains all the organic minerals and therefore is a complete nutrient. Later, seen how strong they grow, you could try not giving them those vaccines. You can read the science behind it in the book "Sea Energy Agriculture" by Maynard Murray.