عناصر مشابهة

• some factors affecting egg quality in relation to hatching results
  بواسطة: Hassan, Abd Alhady Hassan Abd Alkader منشور: (1991)
• Epidemiological Studies on Pasteurellosis in Ducks
  بواسطة: Ghanem, Ibraheim Abd Alrahman منشور: (1986)
• Studies on Productive Characteristics and Egg of Sudani Ducks
  بواسطة: Ibrahim, Abdel moneim Sayed Ahmed منشور: (1984)
• Some studies on the vaccinal strain of duck plague virus
  بواسطة: Abd Alkhalek, Mohammed Abd Alkhalek Aly منشور: (1993)
• Vaccinations against duck epidemics in relation to environmental changes
  بواسطة: Taha, Al Metwally Abd Alaaty منشور: (2001)