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Prof. Dirar Refat Ibrahim Mohamed

Professor, Department of Theriogenology , Faculty of Veterinary Medicine, ِِAssiut University

C.V Details




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Current Address

:

Department of Theriogenology-Faculty of Veterinary Medicine-Assiut University 71526-Assiut - Egypt

Home Tel.

:

088/2288635

Mobile No.

:

01001285788

E-Mail

:

derar.mohamed@aun.edu.eg

google scholar link

:

https://scholar.google.com.eg/citations?user=GOh-I68AAAAJ&hl=en
Educational Qualifications:
  • Ph. D., Faculty of Veterinary Medicine, Assiut University, 2002
  • M. Sc., Faculty of Veterinary Medicine, Assiut University, 1997
  • B. Sc., Faculty of Veterinary Medicine, Assiut University, 1993
  • Professor, Department of Theriogenology , Faculty of Veterinary Medicine, ِِAssiut University, 2012
  • Associate Professor, Department of Theriogenology , Faculty of Veterinary Medicine, Assiut University, 2007
  • Lecturer, Department of Theriogenology , Faculty of Veterinary Medicine, Assiut University, 2002
  • Assistant Lecturer, Department of Theriogenology , Faculty of Veterinary Medicine, Assiut University, 1997
  • Demonstrator, Department of Theriogenology , Faculty of Veterinary Medicine, Assiut University, 1994

Research fields:
Theriogenology

Publications:

1 - A Abultdinova, I Dzakupov, J Roth, A Wehrend, M Sickinger, Vaginal and cervical tumors in dromedary camels, Reproduction in Domestic Animals, Vol.52, PP.5-59, February, 2017
2 - Ahmed Ali, Derar Derar, Fahd Al-Sobyil, Moustafa M Zeitoun, Khaled MA Hassanein, Abdella Al-Howas, Phimosis in male dromedary camels: clinical findings and changes in the hemogram, nitric oxide metabolites and testosterone concentrations, Theriogenology, Elsevier, http://www.sciencedirect.com/science/article/pii/S0093691X16000121, January, 2016
3 - DR Derar1,2, G Badry3, SM Abdel-Raheem4, W Senosy2, Ovarian, endocrinological and metabolic changes in ewes supplemented with short term-metabolic energy during the estrous cycle, Reprod Dom Anim , http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1439-0531, 50 (Suppl. 1), , 1–77 (2015, doi: 10.1111/rda.12498, February, 2015
4 - DR Derar, G Badry, SM Abdel-Raheem, W Senosy , Ovarian, endocrinological and metabolic changes in ewes supplemented with short term-metabolic energy during the estrous cycle , REPRODUCTION IN DOMESTIC ANIMALS , 50, supp (1), , 65-66, doi: 10.1111/rda.12498, February, 2015
5 - Mamoud R Abd Ellah, MI Hamed, DRI Derar, HZ Rateb, Reference Values for Serum Biochemical and Hematological Constituents in Lactating Pregnant Buffaloes , Journal of Advanced Veterinary Research , 5, 186-196, 2015
6 - Mahmoud R. Abd Ellah, Maha I. Hamed, Derar R. Ibrahim Hassan . Rateb, Serum biochemical and haematological reference intervals for water buffalo (Bubalus bubalis) heifers, Journal of the South African Veterinary Association, 85(1), 1-7, 2014
7 - •M.S. Rawy∗, R.I. Derar, T.M. El-Sherry, G.A. Megahed, Plasma steroid hormone concentrations and blood flow of theovarian structures of the female dromedary (Camelusdromedarius) during growth, dominance, spontaneousovulation, luteinization and regression of the follicular wave., Animal Reproduction Science, 148 , 137–144, January, 2014
8 - Abd Ellah, M.R., Maha I. Hamed and Derar, R.I. , Serum biochemical and hematological reference values for lactating buffaloes., Comparative Clinical Pathology, Springer, 23, 1179-1188, 2014
9 - Mahmoud R. Abd Ellah, Derar R.I. Derar, Gaber A. Megahed , Blood Constituents of Buffaloes in Response to Prognosis and Duration of Uterine Torsion, Journal of Animal and Veterinary Advances , 13, 217-222, 2014
10 - T.M. EL-Sherrya,∗, R. Derara, R. Bakryb, Changes in blood flow in ovine follicles and serum concentration of estradiol 17 beta (E2) and nitric oxide (NO) around the time of ovulation in Ossimi ewes, Animal Reproduction Science, © 2013 Elsevier, March, 2013
11 - Reference Values for Hematological and Serum Biochemical constituents for Buffalo's Heifers. , Mahmoud Rushdi Abd Ellah, Maha I. Hamed, Derar R. Ibrahim, Hassan Z. Rateb , XX International Congress of Mediterranean Federation of Health and Production of Ruminants. 19-22 February 2013, Assiut University, Egypt. , 85-94., 2013
12 - W. Senosy1, Sh. M. Abdel-Raheem2, M. Abd-Allah, S. Fahmy3, E.H. Hassan3, R.I. Derar1 , Effect of transient high-energy diets just after ovulation on ovarian performance and metabolic status in cyclic ewes , Small Ruminant Research , www.elsevier.com/locate/smallrumres, 109 , 152– 155, http://ac.els-cdn.com/S0921448812002660/1-s2.0-S0921448812002660-main.pdf?_tid=6376d9a8-d3c6-11e4-9f0a-00000aab0f6b&acdnat=1427381155_029f852d55acf46527ea3f88515ab3ec, July, 2013
13 - Hassan A. Hussein, Mahmoud R. Abd Ellah, Derar R. I. Derar, Antioxidant concentrations in serum, follicular fluid, and corpus luteum of cyclic buffalo cows., Comparative Clinical Pathology , DOI 10.1007/s00580-012-1485-7., 2012
14 - R. Derar1,3, H.A. Hussein1, S. Fahmy2, T.M. El-Sherry1, G. Megahed1, The effect of parity on the efficacy of an ovulation synchronization (Ovsynch) protocol in buffalo (Bubalus bubalis), Anim. Reprod, March, 2012
15 - Hassan A. Hussein & Mahmoud R. Abd Ellah & Derar R. I. Derar, Antioxidant concentrations in serum, follicular fluid, and corpus luteum of cyclic buffalo cows, ORIGINAL ARTICLE, March, 2012
16 - A.M. SALEH; E. A. ABDELHAFEZ and D.R.I. DERAR , Immunohistochemical study of estrogen and progesterone receptors in different size classes of ovarian follicles in dromedary camels. , Assiut Vet. Med. J. , 58, 36 - 56, https://www.researchgate.net/profile/Derar_Derar/publication/272621037_IMMUNOHISTOCHEMICAL_STUDY_OF_ESTROGEN_AND_PROGESTERONE_RECEPTORS_IN_DIFFERENT_SIZE_CLASSES_OF_OVARIAN_FOLLICLES_IN_DROMEDARY_CAMELS/links/54ea14ce0cf2f7aa4d568553/IMMUNOHISTOCHEMICAL-S, 2012
17 - Badry Mahmoud, G., Abdel-Raheem, Sh. M., Senosy, W., and Dera, R.I. (2012), Impact of a short period-energy supplementation on the ovarian follicular dynamics, blood metabolites and sex hormones in ewes, Journal of Agricultural Economics and Development , at http://academeresearchjournals.org/journal/jaed, Vol. 1(6), , pp. 145-152, , http://academeresearchjournals.org/journal/jaed, December, 2012
18 - •M.S. Rawy, D.R. Derar, T.M. El-Sherry and G.A. Megahed, Characterization of Follicular and Luteal Blood Flow in Female Dromedary Camel Induced to Ovulate Using GnRH Analogue , Journal of Camel Practice and Research, Vol 19 No 2, p 1-7, January, 2012
19 - DERAR REFAAT DERAR, MOHAMMAD HAYDER, AHMED ALI1, HATEM HAMDOUN, POSTPARTUM UTERINE INVOLUTION AND LUTEAL ACTIVITY IN FARAFRA EWES LAMBING IN AUTUMN, Assiut Vet. Med. J. , Vol. 58 No. 132, 2012
20 - T.M. EL-SHERRY, D.R. DERAR, M. HAYDER H. HAMDON and E. SAIFELNASR, EFFECT OF PROGESTERONE AND PROSTAGLANDIN ANALOGUE-BASED SYNCHRONIZATION PROGRAMS ON THE FOLLICULAR DYNAMICS AND CONCEPTION RATE AT TWO DIFFERENT BREEDING SEASONS IN SUBTROPICAL EWES, Assiut Vet. Med. J., Vol. 58 No. 135, 2012
21 - A. Ali, R. Derar, H. A. Hussein, M. R. Abd Ellah , A. Kh. Abdel-Razek, Clinical, hematological, and biochemical findings of uterine torsion in buffaloes (Bubalus bubalis) , Animal Reproduction Science, 10.1016/j.anireprosci.2011.05.005, 2011
22 - DR Derar, K Taya, G Watanabe and Y-I Miyake, Characterization of Immunoreactive IGF-I Pattern During the Peri-ovulatory Period of the Oestrous Cycle of Thoroughbred Mares and Its Relation to Other Hormones, Reprod Dom Anim, doi: 10.1111/j.1439-0531.2011.01819.x, 2011
23 - Derar Refaat Derar*, Hasan Ali Hussein, Ahmad Ali Hussein, Reference values for the genitalia of male dromedary before and after puberty using caliper and ultrasonography in subtropics, Theriogenology, 2011
24 - Abd Ellah, M. R, Hussein H. A. and Derar, D. R., Ovarian Follicular Fluid Constituents in Relation to Stage of Estrus Cycle and Size of the Follicle in Buffalo Cows. , The Veterinary World , Vol.3 No.6: , 263-267, 2010
25 - Hussein H.A., Derar, R., Fahmy S., EL-Sherry T., Megahed, G., 3-Ovarian response and progesterone profile during Ovsynch Protocol in Heifers and Pluriparous Buffalo-cows (Bubalus bubalis). , 10 Scientific congress of Egyptian Society for cattle diseases , 2009
26 - G.A. MEGAHED; D.R. DERAR; H.A. HUSSEIN; and A.L.E. MOHMOUD, GENITAL MYCOTIC INFECTION OF THE REPEAT BREEDER MARES AND FIELD TRIALS FOR ITS TREATMENT , Assiut Vet. Med. J., Vol. 55, No. 122, July, 2009
27 - H. Hussein, Derar and A. Ali, R. , Caliper and Ultrasonographic Measurements of the Male Camel Genitalia (Camelus dromedarius) at Different Ages and A mathematical Formula for Determination of Testicular Volume in VIVO. , 9th Scientific Congress of the Egyptian Society for Cattle Disease 2-4 Dec. 2007, Luxor, Egypt pp: 347-358 , December, 2007
28 - A. Ali1, AKh. Abdel-Razek, R. Derar, H.A. Abdel-Rheem, SH Shehata, Forms of Reproductive Disorders in Cattle and Buffaloes in Middle Egypt. , Reprod. Dom. Anim. doi, 2007
29 - Derar R, Haramaki S, Hoque S, Hashizume T, Osawa T, Taya K, Watanabe G, Miyake Y. , Immunoreactive Insulin-like growth factor in plasma during pre- and post-partum periods of thoroughbred mares from which the newborn were removed: its pattern, physiological function and relation to other hormones. , J Equine Sci. , 17(3):75-79., 2006
30 - D. R. I Drear; H. A. Hussein and A. M. Saleh , Morhological and immunohistochemical varations in the camel (Camelus Dromedarius) testis in relation to some endocrinological aspects during different seasonsof year. , Assiut Vet. Med. J. , Faculty of Vet. Med., 51, 1 – 17 , 2005
31 - Moatz,.A. Abdel-Rahman ; Moustafa, M. Ahmed. and Derar, I. D. (2003), Applied study on physical restraint during ultrasonography as stress on health status and some blood parameters of one humped camels( Camelus dromedarius )in Upper Egypt , Assiut Univ. Bull. Environ. Res.,Vol.6 No.1, March, P. 73-78., Vol.6 No.1, March, P. 73-78., P. 73-78, March, 2003
Number of courses0 course