The Effect of Tegal and Magelang Ducks Cross Types on Production, Shell Thickness and Egg Specific Gravity. ANGON : J. Anim. Sci. Tech. [Internet]. 2021 Mar. 15 [cited 2025 Oct. 31];3(1):55-6. Available from: https://jnp.fapet.unsoed.ac.id/index.php/angon/article/view/181