Christensen, V.L., J.L. Grimes, R.D. Rowland, and D.T. Ort. 2006. “Effect of Chelated Calcium Proteinate Fed in the Maternal Diet of Turkey Breeders on Embryo Cardiac Physiology and Poult Quality”. International Journal of Poultry Science 5 (4): 337–343. https://doi.org/10.3923/ijps.2006.337.343.