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Abstract

A protocol for presynchronization of ovarian status with 2 injections of PGF given 14 d apart, with the last PGF injection given 12 or 14 d before Ovsynch increases pregnancy per artificial insemination (P/AI) in dairy cows. We determined the efficacy of reducing the interval from the last PGF...

Author(s)
Colazo, M. G.; Ponce-Barajas, P.; Ambrose, D. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2013, 96, 12, pp 7640-7648
Abstract

Our objectives were to characterize parameters of luteal activity based on milk progesterone concentration (P4c) data from before and after artificial insemination (AI) and to evaluate their potential association with fertility in Holstein cows. Records of AI events (n=4,353) and of milk P4c...

Author(s)
Bruinjé, T. C.; Colazo, M. G.; Ribeiro, E. S.; Gobikrushanth, M.; Ambrose, D. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 1, pp 780-798
Abstract

The primary objective was to determine the variability and repeatability of GnRH-induced LH responses. The secondary objective was to evaluate the associations among plasma LH, FSH, estradiol (E2), and progesterone (P4) concentrations. One hundred lactating Holstein cows (35 primiparous, 65...

Author(s)
Gobikrushanth, M.; Dutra, P. A.; Bruinjé, T. C.; Colazo, M. G.; Butler, S. T.; Ambrose, D. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2017, 100, 8, pp 6753-6762
Abstract

Anogenital distance (AGD) serves as a marker for prenatal androgenization, reproductive development, and fertility in humans and rodents. The primary objectives of this observational study in lactating dairy cows were to (1) characterize the distribution and variability of AGD, (2) determine the...

Author(s)
Gobikrushanth, M.; Bruinjé, T. C.; Colazo, M. G.; Butler, S. T.; Ambrose, D. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2017, 100, 12, pp 9815-9823
Abstract

The objective was to compare pregnancy rates in nulliparous Holstein heifers given PGF 24 h before, or concurrent with, removal of an intravaginal progesterone-releasing (CIDR) insert in 3 timed artificial insemination (TAI) protocols. Heifers (from 2 herds) were assigned randomly, over 11 mo, to ...

Author(s)
Ambrose, D. J.; Emmanuel, D. G. V.; Colazo, M. G.; Kastelic, J. P.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2008, 91, 7, pp 2678-2683