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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 objectives of this study were to determine (1) factors associated with serum concentration of insulin-like growth factor-1 (IGF-1); (2) the relationship between serum IGF-1 concentration during the first week postpartum and ovarian cyclicity status by 35 d postpartum (DPP); (3) an optimum serum ...

Author(s)
Gobikrushanth, M.; Purfield, D. C.; Colazo, M. G.; Wang, Z.; Butler, S. T.; Ambrose, D. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 10, pp 9154-9167
Abstract

Fertility of dairy cattle is generally decreasing. Overall estrus detection efficiency in lactating dairy cattle is low, as expression of estrus is often compromised. Consequently, undetected estrus, low AI-submission rates, and long inter-breeding intervals are the main contributors to poor...

Author(s)
Ambrose, D. J.; Colazo, M. G.; Kastelic, J. P.
Publisher
Sociedade Brasileira de Zootecnia, Viçosa, Brazil
Citation
Revista Brasileira de Zootecnia, 2010, 39, Supplement, pp 383-392
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