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Abstract

This is a review of the physiology and endocrinology of the estrous cycle and how ovarian physiology can be manipulated and controlled for timed artificial insemination (TAI) in beef and dairy cattle. Estrus detection is required for artificial insemination (AI), but it is done poorly in dairy...

Author(s)
Colazo, M. G.; Mapletoft, R. J.
Publisher
Canadian Veterinary Medical Association, Ottawa, Canada
Citation
Canadian Veterinary Journal, 2014, 55, 8, pp 772-780
Abstract

The aim of this study was to compare estradiol benzoate (EB) and GnRH for the induction of ovulation in a TAI protocol in buffalo during the nonbreeding season. In experiment 1, 141 buffaloes (56 cows and 85 heifers) received an intravaginal P4 device (1.0 g) plus EB (2.0-mg, intramuscular [im]) at ...

Author(s)
Carvalho, N. A. T.; Soares, J. G.; Souza, D. C.; Maio, J. R. G.; Sales, J. N. S.; Martins Júnior, B.; Macari, R. C.; D'Occhio, M. J.; Baruselli, P. S.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2017, 87, pp 333-338
Abstract

The study of reproductive physiology in domestic ruminants has progressed from the whole animal to the molecular level in an amazingly short period of time. The volume of information on this subject is enormous; therefore, we have focused on domestic ruminants, with an emphasis on cattle. To date, ...

Author(s)
Smith, M. F.; Geisert, R. D.; Parrish, J. J.
Publisher
Oxford University Press, Cary, USA
Citation
Journal of Animal Science, 2018, 96, 7, pp 2952-2970
Abstract

The aim of this study was to evaluate the performance of heifers from the Pantaneira breed in FTAI programs and characterize follicular dynamics after induced estrus synchronization programs. The pregnancy rate observed in an FTAI program (36,4%) followed by the AI of estrus return was 45.5%. The...

Author(s)
Ferreira, M. G. C. R.; Souza-Cáceres, M. B.; Oliveira-Brochado, N. C. de; Oliveira Júnior, J. S.; Oliveira, M. V. M. de; Melo-Sterza, F. de A.
Publisher
Universidade Federal Rural do Semi-Árido (UFERSA), Mossoro, Brazil
Citation
Acta Veterinaria Brasilica, 2017, 11, 2, pp 133-136
Abstract

Expanded use of artificial insemination (AI) and/or adoption of emerging reproductive technologies for beef heifers and cows require precise methods of estrous-cycle control. New protocols for inducing and synchronizing a fertile estrus in replacement beef heifers and postpartum beef cows in which...

Author(s)
Patterson, D. J.; Thomas, J. M.; Martin, N. T.; Nash, J. M.; Smith, M. F.
Publisher
Elsevier Inc, New York, USA
Citation
Veterinary Clinics of North America, Food Animal Practice, 2013, 29, 3, pp 591-617
Abstract

Objective. Characterize the follicular dynamics and luteal growth and regression pattern of multiparous (MB) and heifer (BH) Murrah buffaloes in Colombian tropical conditions. Material and methods. Ten MB and ten BH were synchronized with a progesterone-releasing intravaginal device. No artificial ...

Author(s)
Ojeda R., A.; Londoño O., R.; Gutierrez R., C.; Gonella-Diaza, A.
Publisher
University of Cordoba, Monteria, Colombia
Citation
Revista MVZ Cordoba, 2014, 19, 2, pp 4130-4140
Abstract

Recent estrous synchronization research has aimed to develop reliable protocols that: (1) rely solely on fixed-timed artificial insemination (TAI); (2) require a maximum of three animal handlings; and (3) are successful in estrous-cycling and non-cycling females. In cows, insertion of an...

Author(s)
Lamb, G. C.
Publisher
American Association of Bovine Practitioners, Stillwater, USA
Citation
Bovine Practitioner, 2010, 44, 1, pp 28-35
Abstract

Progesterone-containing devices can be inserted intravaginally for 14 d to presynchronize the estrous cycle for timed artificial insemination (TAI) in beef heifers ("14-day CIDR-PG" or "Show-Me-Synch" program). The progesterone treatment is effective for presynchronization because cattle develop a...

Author(s)
Escalante, R. C.; Poock, S. E.; Mathew, D. J.; Martin, W. R.; Newsom, E. M.; Hamilton, S. A.; Pohler, K. G.; Lucy, M. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2012, 95, 9, pp 5102-5108
AbstractFull Text

This study was conducted to investigate the effectiveness of fixed-time artificial insemination (TAI) in dairy heifers treated with progesterone-based protocol. The study was performed at the university farm located in southwestern Brazil in May 2009. A total of 39 cycling crossbred dairy heifers...

Author(s)
Oliveira, L. Z.; Lima, V. F. M. H. de; Oliveira, C. S.; Alves, B. G.; Graff, H. B.; Santos, R. M. dos
Publisher
Universidade Federal do Rio Grande do Sul, Faculdade de Veterinária, Porto Alegre, Brazil
Citation
Acta Scientiae Veterinariae, 2011, 39, 2, pp 964
Abstract

Results of clinical experiments show that it is possible to unify intervals from a PGF application to LH peak then to ovulation. In a field experiment, fixed time insemination was tested on the basis of data from clinical experiments. Synchronized heifers and high yielding cows received GnRH 65...

Author(s)
Becker, F.; Göllnitz, K.; Alm, H.; Schneider, F.; Nehring, H.; Kanitz, W.
Publisher
Institute for Animal Husbandry, Belgrade, Yugoslavia
Citation
Biotechnology in Animal Husbandry, 2003, 19, 5/6, pp 41-47

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