Divakar Ambrose

Contact

Faculty of Agricultural, Life and Environmental Sci - Ag, Food & Nutri Sci Dept
Email
dambrose@ualberta.ca

Overview

About

Degree

PhD, University of British Columbia / MVSc, Tamil Nadu Agricultural University

Job/Research Area 

Reproductive Physiology & Management – Dairy Cattle, and Member of AVRI Council 


Research

Research emphasis is on strategies that improve reproductive efficiency in dairy cattle. Primary focus is on endocrine and nutritional factors that influence reproductive outcome, applied embryo technologies, and reproductive ultrasonography. Research interests include: control of ovarian function (synchronization of estrus and ovulation), improving estrus detection efficiency through electronic aids, role of dietary fatty acids on fertility, strategies to reduce early embryonic mortality, postpartum reproductive management (cystic ovarian and anestrous conditions), and corpus luteum function.

Courses

AN SC 472 - Applied Dairy Production Science

Examination of the structure of the dairy industry, evaluation of management practices to optimize production efficiency and animal well-being, and integration of nutritional, physiological, and biochemical processes involved in production of quality milk. Laboratories emphasize practical applications, field trips, and discussion. Prerequisite: (AN SC 101 or 200), AN SC 260 and 310, or consent of instructor.

Winter Term 2021

Browse more courses taught by Divakar Ambrose

Publications

Dairy cows continuously-housed in tie-stalls failed to manifest activity changes during estrus
Author(s): C.A. Felton, M.G. Colazo, P. Ponce-Barajas, C.J. Bench, D.J. Ambrose
Publication Date: 2012
Publication: Canadian Journal of Animal Science
Volume: 92
Page Numbers: 186-196

Relationships between endometrial cytology and interval to first ovulation, and pregnancy in postpartum dairy cows in a single herd
Author(s): A. Dourey, M.G. Colazo, P. Ponce-Barajas, D.J. Ambrose
Publication Date: 2011
Publication: Research in Veterinary Science
Volume: 91
Page Numbers: 149-153

Neither duration of progesterone insert nor initial GnRH treatment affected pregnancy per timed-insemination in dairy heifers subjected to a Co-synch protocol
Author(s): M.G. Colazo, D.J. Ambrose
Publication Date: 2011
Publication: Theriogenology
Volume: 76
Page Numbers: 578-588

The applications of timed artificial insemination and timed embryo transfer in reproductive management of dairy cattle
Author(s): D.J. Ambrose, M.G. Colazo, J.P. Kastelic
Publication Date: 2010
Publication: Revista Brasileira de Zootecnia
Volume: 39
Page Numbers: 383-392

Reproductive performance of dairy Cows is influenced by prepartum feed restriction and dietary fatty acid source
Author(s): M.G. Colazo, A. Hayirli, L. Doepel, D.J. Ambrose
Publication Date: 2009
Publication: Journal of Dairy Science
Volume: 92
Page Numbers: 2562–2571

The effect of porcine luteinizing hormone on synchronization of ovulation and corpus luteum development in beef and dairy cattle
Author(s): T.O. Ree, M.G. Colazo, A.G.A. Lamont, J.P. Kastelic, M.K. Dyck, R.J. Mapletoft, B.N. Ametaj, D.J. Ambrose
Publication Date: 2009
Publication: Theriogenology
Volume: 72
Page Numbers: 120-128

Effects of dietary energy and protein density on plasma concentrations of leptin and metabolic hormones in dairy heifers
Author(s): P.K. Chelikani, D.J. Ambrose, D.H. Keisler, J.J. Kennelly
Publication Date: 2009
Publication: Journal of Dairy Science
Volume: 92
Page Numbers: 1430-1441

Plasma luteinizing hormone concentrations in cows given repeated treatments or three different doses of gonadotropin releasing hormone
Author(s): M.G. Colazo, T. O. Ree, D.G.V. Emmanuel, D.J. Ambrose
Publication Date: 2009
Publication: Theriogenology
Volume: 71
Page Numbers: 984-992

Postpartum anestrus in dairy cattle
Author(s): A.T. Peter, P.L.A.M. Vos, D.J. Ambrose
Publication Date: 2009
Publication: Theriogenology
Volume: 71
Page Numbers: 1333-1342

Pregnancy rates to timed-AI in dairy cows treated with gonadotropin releasing hormone or porcine luteinizing hormone
Author(s): M.G. Colazo, M.B. Gordon, R. Rajamahendran, R.J. Mapletoft, D.J. Ambrose
Publication Date: 2009
Publication: Theriogenology
Volume: 72
Page Numbers: 262-270

Mixed-breed twin production by contralateral direct transfer of male embryos to beef cow recipients bred to GnRH-based, fixed-time AI
Author(s): J.A. Small, D.J. Ambrose, R. Rajamahendran, J.P. Kastelic
Publication Date: 2008
Publication: Livestock Science
Volume: 118
Page Numbers: 272-281

Pregnancy rates to timed AI in Holstein heifers given prostaglandin F2a concurrent with, or 24 h prior to, removal of an intravaginal progesterone-releasing insert
Author(s): D.J. Ambrose, D.G.V. Emmanuel, M.G. Colazo, J.P. Kastelic
Publication Date: 2008
Publication: Journal of Dairy Science
Volume: 91
Page Numbers: 2678-2683

Diets enriched in unsaturated fatty acids enhance early embryonic development in lactating Holstein cows
Author(s): G. Thangavelu, M.G. Colazo, D.J. Ambrose, M. Oba, E.K. Okine and M.K. Dyck
Publication Date: 2007
Publication: Theriogenology
Volume: 68
Page Numbers: 949-957

Lower pregnancy losses in lactating dairy cows fed a diet enriched in a-linolenic acid
Author(s): D.J. Ambrose, J.P. Kastelic, R. Corbett, P.A. Day, J.A. Small, H.V. Petit, P. Zalkovic
Publication Date: 2006
Publication: Journal of Dairy Science
Volume: 89
Page Numbers: 3066-3079

Progesterone (CIDR)- based timed AI protocols using GnRH, porcine LH or estradiol cypionate for dairy heifers: Ovarian and endocrine responses and pregnancy rates
Author(s): D.J. Ambrose, J.P. Kastelic, R. Rajamahendran, M. Aali, N. Dinn
Publication Date: 2005
Publication: Theriogenology
Volume: 64
Page Numbers: 1457-1474

Ovarian and endocrine responses associated with the treatment of cystic ovarian follicles in dairy cows with gonadotropin releasing hormone and prostaglandin F2a, with or without exogenous progesterone
Author(s): D.J. Ambrose, E.J-P. Schmitt, F. L. Lopes, R.C. Mattos, W.W. Thatcher
Publication Date: 2004
Publication: Canadian Veterinary Journal
Volume: 45
Page Numbers: 931-937