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Abstract

This experiment was designed to compare pregnancy rates in postpartum beef cows following split-time (STAI) or fixed-time (FTAI) artificial insemination. Estrus was synchronized for 671 cows at seven locations following administration of the 7-d CO-Synch + CIDR protocol (100 µg GnRH+CIDR insert...

Author(s)
Bishop, B. E.; Thomas, J. M.; Abel, J. M.; Poock, S. E.; Ellersieck, M. R.; Smith, M. F.; Patterson, D. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2017, 99, pp 48-52
Abstract

This experiment was designed to test the hypothesis that delayed insemination of nonestrous cows would increase pregnancy rates when using sex-sorted semen in conjunction with fixed-time artificial insemination (FTAI). Estrus was synchronized for 656 suckled beef cows with the 7-d...

Author(s)
Thomas, J. M.; Lock, S. L.; Poock, S. E.; Ellersieck, M. R.; Smith, M. F.; Patterson, D. J.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2014, 92, 4, pp 1747-1752
Abstract

Two experiments evaluated controlled internal drug release (CIDR)-based protocols to synchronize estrus in primiparous 2-year-old beef cows. In each experiment, treatments were balanced according to body condition score and days postpartum. Experiment 1 compared the 14-day CIDR-PG (14-d) and 7-day...

Author(s)
Abel, J. M.; Bishop, B. E.; Thomas, J. M.; Ellersieck, M. R.; Poock, S. E.; Smith, M. F.; Patterson, D. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2017, 87, pp 306-315
Abstract

Two experiments were designed to test the hypothesis that pregnancy rates after fixed-time artificial insemination (FTAI) in beef heifers and cows may be improved by delaying insemination of females that have not expressed estrus before FTAI. In Exp. 1, estrus was synchronized for 931 heifers...

Author(s)
Thomas, J. M.; Poock, S. E.; Ellersieck, M. R.; Smith, M. F.; Patterson, D. J.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2014, 92, 9, pp 4189-4197
Abstract

Two experiments evaluated timing of GnRH administration in beef heifers and cows on the basis of estrous status during split-time artificial insemination (AI) after controlled internal drug release (CIDR) based protocols. In experiment 1, estrus was synchronized for 816 pubertal and prepubertal or...

Author(s)
Bishop, B. E.; Thomas, J. M.; Abel, J. M.; Poock, S. E.; Ellersieck, M. R.; Smith, M. F.; Patterson, D. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 86, 4, pp 1102-1110
Abstract

An experiment was designed to evaluate endocrine parameters, ovarian dynamics, and pregnancy rates to fixed-time artificial insemination (FTAI) following the 9-d CIDR-PG protocol in comparison to the 14-d CIDR-PG protocol. While both are long-term protocols using CIDR treatment for...

Author(s)
Thomas, J. M.; Locke, J. W. C.; Bishop, B. E.; Abel, J. M.; Ellersieck, M. R.; Poock, S. E.; Smith, M. F.; Patterson, D. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2017, 103, pp 185-190
Abstract

This experiment compared 2 long-term controlled internal drug release (CIDR)-based protocols to synchronize estrus before fixed-time artificial insemination (FTAI) in postpartum beef cows. Cows were assigned to treatments by age, BCS, and days postpartum. Cows assigned to the 14- to 19-d CIDR-PGF ...

Author(s)
Martin, N. T.; Thomas, J. M.; Nash, J. M.; Mallory, D. A.; Ellersieck, M. R.; Poock, S. E.; Smith, M. F.; Patterson, D. J.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2014, 92, 4, pp 1759-1767
Abstract

A pilot experiment was designed to test the hypothesis that administration of PGF before progestin treatment would allow for a reduced duration of progestin treatment in a long-term progestin-based estrus synchronization protocol. A modified presynchronization treatment was compared with a...

Author(s)
Thomas, J. M.; Bishop, B. E.; Abel, J. M.; Ellersieck, M. R.; Smith, M. F.; Patterson, D. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 85, 9, pp 1555-1561
Abstract

This experiment was designed to compare pregnancy rates in postpartum beef cows resulting from fixed-time AI (FTAI) at 54 or 66 h after administration of the CO-Synch+controlled internal drug-release (CIDR) protocol. Cows (n=851) at 2 locations over 2 yr (yr 1, n=218 and 206; and yr 2, n=199 and...

Author(s)
Busch, D. C.; Schafer, D. J.; Wilson, D. J.; Mallory, D. A.; Leitman, N. R.; Haden, J. K.; Ellersieck, M. R.; Smith, M. F.; Patterson, D. J.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2008, 86, 7, pp 1519-1525
Abstract

This experiment was conducted to compare pregnancy rates in postpartum beef cows resulting from fixed-time AI (FTAI) after treatment with controlled internal drug release (CIDR)-based protocols to synchronize estrus. Cows assigned to the Show-Me-Synch (n=167) protocol received a CIDR from d 0 to...

Author(s)
Nash, J. M.; Mallory, D. A.; Ellersieck, M. R.; Poock, S. E.; Smith, M. F.; Patterson, D. J.
Publisher
Elsevier Ltd, Oxford, UK
Citation
Animal Reproduction Science, 2012, 132, 1/2, pp 11-16

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