R. El Sayed, D. Ibrahim, S. A. El-Mandrawy, and D. M. AbdelFattah, “EFFECT OF DIETARY BETAINE AND LOW METHIONINE ON MULARD DUCK PERFORMANCE, BLOOD PARAMETERS AND LIPOGENESIS GENE EXPRESSION”, SVR, vol. 55, no. 20-Suppl, pp. 283–94, Nov. 2018.