Ayadi, Moez, (1) Dept. Animal Production, College of Food and Agriculture Sciences, King Saud University. Riyadh, Saudi Arabia (2) Dept. Biotechnologie Animale, Institut Supérieur de Biotechnologie de Beja, Université de Jendouba, B.P. 382, Av. Habib Bourguiba, 9000 Beja, Tunisia, Saudi Arabia