|Credentials:||1998-Ph.D.; Virginia Polytechnic Institute and State University|
PO Box 442330
Physiology of Reproduction
My research is in the area of applied cattle reproduction with emphasis on nutrition and reproduction interaction as well as improvement and development of new systematic breeding program to enhance reproductive efficiency of dairy and beef cattle. In my research program I emphasize applied research that has a direct impact on reproductive efficiency and management of dairy cows ultimately increasing profitability of dairy farms.
Specific areas of research are:
- Development and modification of estrous synchronization protocol to increase pregnancy rate in dairy and beef cattle
- Examining the role of environment, management, and diseases on cattle reproduction
- Interaction between nutrition and reproduction. The role of dietary protein (urea and pH) on uterine secretion
- Enhancing conception rate by reducing early embryonic loss
Lopes, G., Jr., et al. (2013). "Evaluation of reproductive and economic outcomes of dairy heifers inseminated at induced estrus or at fixed time after a 5-day or 7-day progesterone insert-based ovulation synchronization protocol." J Dairy Sci 96(3): 1612-1622.
Johnson, C. R., et al. (2012). "Short communication: characterization of early postpartum estrous behavior and ovulation in lactating dairy cows using radiotelemetry." J Dairy Sci 95(9): 5085-5088.
Dalton, J. C., et al. (2012). "Fertility-associated antigen on Nelore bull sperm and reproductive outcomes following first-service fixed-time AI of Nelore cows and heifers." Theriogenology 77(2): 389-394.
Ahmadzadeh, A., F. Frago, B. Shafii, J.C. Dalton, W.J. Price, and M.A. McGuire, Effect of clinical mastitis and other diseases on reproductive performance of Holstein cows. Anim Reprod Sci, 2009. 112(3-4): p. 273-82.
Stevenson, J.L., J.C. Dalton, J.E. Santos, R. Sartori, A. Ahmadzadeh, and R.C. Chebel, Effect of synchronization protocols on follicular development and estradiol and progesterone concentrations of dairy heifers. J Dairy Sci, 2008. 91(8): p. 3045-56.
Ahmadzadeh, A., R. Manzo, C. B. Sellars, and J. C. Dalton. The efficacy of a reduced dose of gonadotropin releasing hormone on the incidence and time of ovulation in Holstein cows. J. Anim. Vet. Adv, 2007. 6:1328-133.
Howard, J. M., R. Manzo, F. Frago, D. G. Falk, J. B. Glaze, Jr, J. C. Dalton, and A. Ahmadzadeh. Estradiol cypionate did not affect pregnancy rates of beef cattle synchronized with a modified timed artificial insemination protocol. Prof. Anim. Sci., 2007. 23:509-512.
Frago, F, R. Manzo, J. C. Dalton, M. A. McGuire, and A. Ahmadzadeh. Naloxone increases serum calcium concentrations after parturition in multiparous Holstein cattle. Prof. Anim. Sci., 2007. 23:70-74.
Ahmadzadeh, A., et al. (2006). "Dopamine antagonist alters serum cortisol and prolactin secretion in lactating Holstein cows." J Dairy Sci 89(6): 2051-2055.
Howard, J.M., R. Manzo, J.C. Dalton, F. Frago, and A. Ahmadzadeh, Conception rates and serum progesterone concentration in dairy cattle administered gonadotropin releasing hormone 5 days after artificial insemination. Anim Reprod Sci, 2006. 95(3-4): p. 224-33.
Sellars, C.B., J.C. Dalton, R. Manzo, J. Day, and A. Ahmadzadeh, Time and incidence of ovulation and conception rates after incorporating estradiol cypionate into a timed artificial insemination protocol. J Dairy Sci, 2006. 89(2): p. 620-6.
Dalton, J. C., et al. (2005). "Short communication: Conception rates following detection of estrus and timed AI in dairy cows synchronized using GnRH and PGF2alpha." J Dairy Sci 88(12): 4313-4316.
Dalton, J.C., R. Manzo, A. Ahmadzadeh, B. Shafii, W.J. Price, and J.M. DeJarnette, Short communication: Conception rates following detection of estrus and timed AI in dairy cows synchronized using GnRH and PGF2alpha. J Dairy Sci, 2005. 88(12): p. 4313-6.
Dalton, J. C., et al. (2004). "Effect of simultaneous thawing of multiple 0.5-mL straws of semen and sequence of insemination on conception rate in dairy cattle." J Dairy Sci 87(4): 972-975.
Boyle, SM and A. Ahmadzadeh. Immunocontraception as an approach to help control feral cat population. In Consultation in Feline Medicine. J.K. August [eds.]. 2000. W.B. Saunders Co. Philadelphia (in press)
Center for Reproductive Biology is cited as author affiliation.