Sole Source™ in poultry nutrition means that 100% of supplemental zinc comes from a highly bioavailable organic source such as Zinpro® Availa® Zn, with no inorganic zinc (e.g., zinc sulphate). Because organic zinc is absorbed and utilized more efficiently, nutritionists can reduce total dietary zinc while maintaining or improving performance. Research shows that feeding 60 ppm Availa® Zn as a Sole Source improved body weight, feed conversion and breast meat yield, while reducing zinc excretion. Replacing 90 ppm zinc sulphate with 60 ppm Availa® Zn reduced zinc levels in litter by 24%, supporting more sustainable poultry production.