Konrád, Szilárd, Anett Kovács, and Katalin Kovácsné Gaál. “Objective Measurement of Egg Yolk Colour”. Animal welfare, Ethology and Housing Systems (AWETH) 8, no. 1 (June 25, 2012): 36–43. Accessed December 5, 2025. https://journal.uni-mate.hu/index.php/aweth/article/view/6750.