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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 effects of extended progestin exposure, gonadotropin-releasing hormone (GnRH) versus prostaglandin (PG) F at controlled internal drug-release (CIDR) insertion, and GnRH on d 7 versus 9 of a 14-d CIDR on ovarian response and timed AI (TAI) pregnancy rate were evaluated. In Exp. 1 beef heifers...

Author(s)
French, J. T.; Ahola, J. K.; Whittier, J. C.; Giles, R. L.; Repenning, P. E.; Seidel, G. E., Jr.; Peel, R. K.
Publisher
American Registry of Professional Animal Scientists (ARPAS), Champaign, USA
Citation
Professional Animal Scientist, 2013, 29, 1, pp 64-74
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

Maximizing reproductive efficiency depends upon whether a heifer attains puberty before the start of the breeding season, conceives early in the breeding season, calves unassisted, raises the calf to the time it is marketed, and the heifer/cow must conceive to calve early during the subsequent...

Author(s)
Lamb, G. C.; Smith, M. F.; Perry, G. A.; Atkins, J. A.; Risley, M. E.; Busch, D. C.; Patterson, D. J.
Publisher
American Association of Bovine Practitioners, Stillwater, USA
Citation
Bovine Practitioner, 2010, 44, 1, pp 18-26
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

Author(s)
Gatien, J.; Ponsart, C.; Humblot, P.
Publisher
Société Française de Buiatrie, Labastide St Pierre, France
Citation
European Buiatrics Forum, Palais du Pharo, Marseille, 1-3 December 2009, 2009, pp 164
Abstract

The association between conception rate at first service and numbers of follicles developed during a follicular wave was examined in 102 suckled beef cows and 14 heifers. Follicular development was monitored using ultrasonography for either two (trial 1) or three (trial 2) consecutive oestrous...

Author(s)
Starbuck-Clemmer, M. J.; Hernandez-Fonseca, H.; Ahmad, N.; Seidel, G.; Inskeep, E. K.
Publisher
Blackwell Publishing, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2007, 42, 4, pp 337-342
Abstract

An experiment was conducted to investigate the effect of different doses of follicle stimulating hormone (FSH) used in a superovulation program on numbers of corpora lutea, total ova/embryos and transferable embryos in Kamphaeng Saen beef cattle. Cyclic cows (n=3) and heifers (n=3) of Kamphaeng...

Author(s)
Nilchuen, P.; Rattanatabtimtong, S.; Chomchai, S.
Publisher
Prince of Songkla University, Hat Yai, Thailand
Citation
Songklanakarin Journal of Science and Technology, 2011, 33, 6, pp 679-683
Abstract

The objective of this study was to determine the effects of low versus physiologic plasma progesterone concentrations during the ovulatory wave on fertility in cattle. Suckled beef cows (Bos taurus; n=129) and pubertal heifers (Bos taurus; n=150) at random stages of the estrous cycle were given a...

Author(s)
Pfeifer, L. F. M.; Mapletoft, R. J.; Kastelic, J. P.; Small, J. A.; Adams, G. P.; Dionello, N. J.; Singh, J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2009, 72, 9, pp 1237-1250

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