Biography

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

100%

Reproduction

62%

Pregnancy

90%

Ultrasound

75%

Dairy Cows

55%

Research Publications in Numbers

Books
0

Chapters
0

Articles
0

Abstracts
0

Selected Publications

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.
CrossRef | Direct Link |
El-Zarkouny, S.Z., 2014. Short-term feeding of melengestrol acetate plus GnRH and PGF_2α to enhance reproductive efficiency of replacement dairy heifers. Egypt. J. Anim. Prod., 51: 156-163.
Direct Link |
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.
CrossRef | Direct Link |
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.
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.
CrossRef | Direct Link |
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.
CrossRef | Direct Link |
El-Zarkouny, S.Z. and D.J. Kesler, 2010. Effects of short-term feeding of MGA combined with GnRH and PGF_2α on reproduction of beef cows. Anim. Reprod., 7: 35-41.
Direct Link |
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.
Direct Link |
El-Zarkouny, S.Z., 2009. Effectiveness of GnRH/PGF_2α-based protocols on reproductive efficiency of Holstein heifers. Alex. J. Agric. Res., 54: 63-69.
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.
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.
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.
Direct Link |
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.
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.
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.
CrossRef | Direct Link |
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.
CrossRef | Direct Link |
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.
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.
CrossRef | Direct Link |
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.
Direct Link |
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.
CrossRef | Direct Link |
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.
CrossRef | Direct Link |
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.
CrossRef | Direct Link |