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Animal Science Database

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Abstract

The objective was to evaluate in-line milk progesterone (mP4) data to determine dynamics of pre- and post-insemination mP4 profiles and their associations with parity and outcomes of artificial insemination (AI) in Holstein cows. Milk progesterone (ng/mL) was quantified at pre-determined time...

Author(s)
Bruinjé, T. C.; Gobikrushanth, M.; Colazo, M. G.; Ambrose, D. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2017, 102, pp 147-153
Abstract

Ovulation of an early-stage dominant follicle induced by exogenous GnRH reportedly results in a reduced ovulatory follicle size and fertility in beef and dairy cattle. Objectives were to examine factors associated with ovulatory follicle diameter and the relationship between ovulatory follicle...

Author(s)
Colazo, M. G.; Behrouzi, A.; Ambrose, D. J.; Mapletoft, R. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2015, 84, 3, pp 377-383
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
Abstract

The objectives were to determine the effects of supplemental fat (no oilseed vs. oilseed) during late gestation and the source of fat (canola vs. sunflower seed), on dry matter intake (DMI), plasma metabolite concentrations, milk production and composition, calf birth weight, postpartum health...

Author(s)
Salehi, R.; Colazo, M. G.; Oba, M.; Ambrose, D. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 5, pp 3584-3597
Abstract

The objective of this study was to determine the effects of feed restriction and source of dietary fatty acids during the close-up dry period on postcalving reproductive performance of dairy cattle. Thirty-four days before expected calving, pregnant Holstein cows (n=72; parity 1 to 5) were randomly ...

Author(s)
Colazo, M. G.; Hayirli, A.; Doepel, L.; Ambrose, D. J.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2009, 92, 6, pp 2562-2571