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Research Interests
Physiology of Reproduction
Research Summary
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
Research Publications
Ahmadzadeh, A., F. Frago, B. Shafii, J.C. Dalton, W.J. Price, M. A. McGuire. 2008. Effect of clinical mastitis and other diseases on reproductive performance of Holstein cows. Anim. Reprod. Sci. (in Press).
Ahmadzadeh, A., R. Manzo, C. B. Sellars, and J. C. Dalton. 2007. The efficacy of a reduced dose of gonadotropin releasing hormone on the incidence and time of ovulation in Holstein cows. J. Anim. Vet. Adv .6:1328-133.
Howard, J. M., R. Manzo, F. Frago, D. G. Falk, J. B. Glaze, Jr, J. C. Dalton, and A. Ahmadzadeh . 2007. E stradiol cypionate did not affect pregnancy rates of beef cattle synchronized with a modified timed artificial insemination protocol. Prof. Anim. Sci.23:509-512.
Frago, F, R. Manzo, J. C. Dalton, M. A. McGuire, and A. Ahmadzadeh . 2007. Naloxone increases serum calcium concentrations after parturition in multiparous Holstein cattle. Prof. Anim. Sci. 23:70-74.
Ahmadzadeh, A., M. A. Barnes, F. C. Gwazdauskas, and R. M Akers. 2006. Effect of dopamine antagonist on serum cortisol and prolactin secretion in lactating Holstein cows. J. Dairy Sci. (in press)
Sellars C. B., J. C. Dalton, R. Manzo, J. Day, and A. Ahmadzadeh . 2006. Time and Incidence of Ovulation and Conception Rates after Incorporating Estradiol Cypionate into a Timed AI Protocol. J. Dairy Sci. 89: 89: 620-626.
Howard, J, M., R. Manzo, J. C. Dalton, F. Frago, and A. Ahmadzadeh. 2006. Conception rates and serum progesterone concentration in dairy cattle administered gonadotropin releasing hormone five days after artificial insemination. Anim. Reprod. Sci. 96:224-233 .
Dalton, J. C., R. Manzo, A. Ahmadzadeh, B. Shafii, W. J. Price, and J. M. DeJarnette. 2005. Conception rates following estrous detection and timed AI in dairy cows synchronized using GnRH and PGF2α. J. Dairy Sci. 88: 4313-4316.