Dr. Samir  Zaki El-Zarkouny
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Dr. Samir Zaki El-Zarkouny

Alexandria University, Egypt

Highest Degree
Ph.D. in Animal Science from Kansas State University, Manhattan, Kansas, USA

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Dr. Samir Zaki El-Zarkouny is currently working as Professor at Department of Animal and Fish Production Faculty Agriculture, Alexandria University Aflatoon St., El-Shatby, Alexandria, Egypt. He has completed his Ph.D. in Animal Science from Kansas State University, Manhattan, Kansas, USA. His main area of interest focuses on Animal and Veterinary Sciences. His area of expertise includes Reproduction, Dairy Cows, Ewes, Goats, Ultrasound, Pregnancy, and Estrus. He has 24 publications in journals as author/co-author.

Area of Interest:

Animal and Veterinary Sciences
Dairy Cows

Research Publications in Numbers


Selected Publications

  1. Hashem, N.M. and S.Z. El-Zarkouny, 2014. Effect of short-term supplementation with rumen-protected fat during the late luteal phase on reproduction and metabolism of ewes. J. Anim. Physiol. Anim. Nutr., 98: 65-71.
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  2. El-Zarkouny, S.Z., 2014. Short-term feeding of melengestrol acetate plus GnRH and PGF to enhance reproductive efficiency of replacement dairy heifers. Egypt. J. Anim. Prod., 51: 156-163.
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  3. Ahmed, M.G., S.Z. El-Zarkouny, K.A. El-Shazly and S.M.A. Sallam, 2014. Impact of essential oils blend on methane emission, rumen fermentation characteristics and nutrient digestibility in Barki sheep. J. Agric. Sci., 6: 144-156.
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  4. Hashem, N.M. and S.Z. El-Zarkouny, 2013. Serum bio-chemical profile, growth performance and health conditions of pre-weaning holstein calves supplemented with yeast extract or eucalyptus oil. Egypt. J. Nutr. Feeds, 16: 273-279.
  5. Hashem, N.M., S.Z. El-Zarkouny, T.A. Taha and Z.R. Abo-Elezz, 2011. Effect of season, month of parturition and lactation on estrus behavior and ovarian activity in Barki x Rahmani crossbred ewes under subtropical conditions. Theriogenology, 75: 1327-1335.
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  6. El-Zarkouny, S.Z., M.M. Shaaban and J.S. Stevenson, 2011. Blood metabolites and hormone-based programmed breeding treatments in anovular lactating dairy cows. J. Dairy Sci., 94: 6001-6010.
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  7. El-Zarkouny, S.Z. and D.J. Kesler, 2010. Effects of short-term feeding of MGA combined with GnRH and PGF on reproduction of beef cows. Anim. Reprod., 7: 35-41.
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  8. Nour El-Din, A.N.M., S.Z. El-Zarkouny, H. Ghobashy, E.I. Abdel-Gawad and D.J. Kesler, 2009. Growth, haematological and biochemical responses of growing lambs injected. South Afr. J. Anim. Sci., 39: 65-68.
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  9. El-Zarkouny, S.Z., 2009. Effectiveness of GnRH/PGF-based protocols on reproductive efficiency of Holstein heifers. Alex. J. Agric. Res., 54: 63-69.
  10. El-Zarkouny, S.Z. and A.N.M. Nour El-Din, 2009. Effect of new and used CIDR devices on fertility and follicular parameters in ewes and ewe lambs during their natural non-breeding season. Alex. J. Agric. Res., 54: 53-61.
  11. Morsy, A.S., T.A. Taha, E.I. Abdel-Gawad, S.Z. El-Zarkouny and G.A. Hassan, 2008. Effect of dietary calcium soaps on reproductive performance and blood biochemical traits of pregnant Barki Ewes. Alex. J. Agric. Res., 53: 7-17.
  12. El-Zarkouny, S.Z., A.N.M. Nour El-Din, H. Ghobashy and E.I. Abdel-Gawad, 2008. Accuracy of early pregnancy diagnosis and detection of twins using real-time ultrasonography compared to progesterone concentration in Barki goats. Egypt. J. Anim. Prod., 45: 131-138.
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  13. Hassan, G.A., A.A. El-Hanafy, M.H. Sallem, B.A. Ali, M.M. Mohamed and S. El-Zarkouni, 2007. Effect of recombinant bovine somatotropin (rBST) on milk production, milk composition and reproductive performance of lactating Egyptian buffaloes. Buffalo J., 23: 29-39.
  14. El-Zarkouny, S.Z., H. Ghobashy, A.N.M. Nour El-Din and E.I. Abdel-Gawad, 2007. Lambing and embryonic mortality rates in Awassi and Barki ewes and their crosses throughout three different mating seasons in the west-coastal region of Egypt. Alex. J. Agric. Res., 52:: 15-24.
  15. El-Zarkouny, S.Z., J.A. Cartmill, B.A. Hensley and J.S. Stevenson, 2004. Pregnancy in dairy cows after synchronized ovulation regimens with or without presynchronization and progesterone. J. Dairy Sci., 87: 1024-1037.
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  16. El-Zarkouny, S.Z. and J.S. Stevenson, 2004. Resynchronizing estrus with progesterone or progesterone plus estrogen in cows of unknown pregnancy status. J. Dairy Sci., 87: 3306-3321.
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  17. Weiss, M.L., K.E. Mitchell, J.E. Hix, S. Medicetty, S.Z. El-Zarkouny, D. Grieger and D.L. Troyer, 2003. Xenotransplantation of porcine umbilical cord matrix cells into the rat brain. Exp. Neurol., 82: 288-299.
  18. Stevenson, J.S., J.A. Cartmill, B.A. Hensley and S.Z. El-Zarkouny, 2003. Conception rates of dairy cows following early not-pregnant diagnosis by ultrasonography and subsequent treatments with shortened Ovsynch protocol. Theriogenology, 60: 475-483.
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  19. Stevenson, J.S., G.C. Lamb, S.K. Johnson, M.A. Medina-Britos and D.M. Grieger et al., 2003. Supplemental norgestomet, progesterone, or melengestrol acetate increases pregnancy rates in suckled beef cows after timed inseminations. J. Anim. Sci., 81: 571-586.
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  20. Cartmill, J.A., S.Z. El-Zarkouny, B.A. Hensley, T.G. Rozell, J.F. Smith and J.S. Stevenson, 2001. An alternative AI breeding protocol for dairy cows exposed to elevated ambient temperatures before or after calving or both. J. Dairy Sci., 84: 799-806.
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  21. Cartmill, J.A., S.Z. El-Zarkouny, B.A. Hensley, G.C. Lamb and J.S. Stevenson, 2001. Stage of cycle, incidence and timing of ovulation and pregnancy rates in dairy cattle after three timed breeding protocols. J. Dairy Sci., 84: 1051-1059.
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  22. El-Zarkouny, S.A., M.A. Ayoub, M.H.G. Ishak, F.D. El Nouty, G.A. Hassan, Z.R. El-Ezz and M.H. Salem, 1999. Effect of carbosulfan pesticide and selenium on some semen characteristics and serum testosterone in male rabbits. Int. J. Environ. Health Res., 9: 117-124.
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