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Abstract

Current bovine pregnancy detection methods are not reliable until at least day 28 post artificial insemination (AI). The bovine estrous cycle is approximately 21 days; consequently, producers miss an opportunity to rebreed at the next estrous event. Therefore, commercial interest exists for the...

Author(s)
Johnston, D.; Estepa, I. M.; Ebhardt, H. A.; Crowe, M. A.; Diskin, M. G.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2018, 114, pp 301-307
Abstract

Numerous treatments and protocols have been used to control the reproductive cycle in cattle, with varying effectiveness and many involving the administration of steroid hormones. Steroid hormones, such as estradiol, are perceived as having a negative impact on consumer health. This internationally ...

Author(s)
Yapura, M. J.; Zwiefelhofer, E. M.; Pierson, R. A.; Adams, G. P.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2018, 112, pp 18-25
AbstractFull Text

The goal of this study is to estimate the effects of low-level laser irradiation (LLLI) on the superovulatory response according to the number of corpora lutea (CL), follicles (F) and the embryo yield. In recent years, while searching for new, more efficient and organic methods to improve...

Author(s)
Palubinskas, G.; Žilaitis, V.; Antanaitis, R.
Publisher
Polish Academy of Sciences, Committee of Veterinary Sciences, Olsztyn-Kortowo II, Poland
Citation
Polish Journal of Veterinary Sciences, 2017, 20, 2, pp 307-312
Abstract

Two long-term, CIDR-based estrus synchronization protocols were evaluated among Bos indicus-influenced and Bos taurus beef heifers. Treatments were evaluated on the basis of estrous response and pregnancy rate resulting from fixed-time artificial insemination (FTAI), and these outcomes were...

Author(s)
Thomas, J. M.; Locke, J. W. C.; Bishop, B. E.; Abel, J. M.; Ellersieck, M. R.; Yelich, J. V.; Poock, S. E.; Smith, M. F.; Patterson, D. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2017, 92, pp 190-196
Abstract

A method for timed artificial insemination (AI) that is used for beef cows, beef heifers, and dairy heifers employs progesterone-releasing inserts, such as the controlled internal drug release (CIDR; Zoetis, New York, NY, USA) that are left in place for 14 days. The 14-day CIDR treatment is a...

Author(s)
Escalante, R. C.; Poock, S. E.; Lucy, M. C.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2013, 80, 8, pp 903-913
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

The objectives were to compare the effects of 2 methods of presynchronization and 2 lengths of proestrus on fertility of grazing dairy cows subjected to a 5-d timed artificial insemination (AI) protocol at initiation of breeding season. Lactating dairy cows (n=1,754) from 3 seasonal grazing farms...

Author(s)
Ribeiro, E. S.; Monteiro, A. P. A.; Lima, F. S.; Ayres, H.; Bisinotto, R. S.; Favoreto, M.; Greco, L. F.; Marsola, R. S.; Thatcher, W. W.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2012, 95, 5, pp 2513-2522
Abstract

Studies of postpartum endometrial physiologic and immune mechanisms in cows are compromised by the difficulty in acquiring tissue of suitable quality and in sufficient quantity (Bos taurus). Endometrial biopsy sampling has attracted concern regarding potential animal ill-health and perturbed...

Author(s)
Chapwanya, A.; Meade, K. G.; Narciandi, F.; Stanley, P.; Mee, J. F.; Doherty, M. L.; Callanan, J. J.; O'Farrelly, C.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2010, 73, 7, pp 988-994
Abstract

This is the very first report that suggests high pregnancy rates can be obtained with use of the Doublesynch protocol in anestrous dairy cows. Recently, a new synchronization method has been developed (Doublesynch) that resulted in synchronized ovulations both after the first and second...

Author(s)
Öztürk, Ö. A.; Cİrİt, Ü.; Baran, A.; Ak, K.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2010, 73, 5, pp 568-576
Abstract

Cattle that are not pregnant to first fixed-time artificial insemination (TAI) may be resynchronized for a second TAI if they are found nonpregnant at pregnancy diagnosis. The specific interval between first and second TAI ranges from 4 to 8 wk. The selected interval depends on the available method ...

Author(s)
Green, J. C.; Okamura, C. S.; Mathew, D. J.; Newsom, E. M.; Lucy, M. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 12, pp 5668-5672

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