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Animal Science Database

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Abstract

The primary objective was to determine if low doses of PGF2α (dinoprost) given intramuscularly (im) concurrent with timed artificial insemination (TAI) would improve conception rates in dairy cattle. A secondary objective was to determine if body condition score (BCS) and parity would influence...

Author(s)
Ambrose, D. J.; Mohanathas Gobikrushanth; Zuidhof, S.; Kastelic, J. P.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2015, 83, 4, pp 529-534
Abstract

The objective of this retrospective study was to determine the factors affecting pregnancy per artificial insemination (P/AI) and pregnancy loss in lactating dairy cattle. Breeding records (n=1466) for 5 consecutive years were evaluated from one dairy herd. The effects of type of breeding [timed ...

Author(s)
Thangavelu, G.; Gobikrushanth, M.; Colazo, M. G.; Ambrose, D. J.
Publisher
Agricultural Institute of Canada, Ottawa, Canada
Citation
Canadian Journal of Animal Science, 2015, 95, 3, pp 383-388
Abstract

The objectives of this study were to (1) evaluate factors associated with variation in circulating anti-Müllerian hormone (AMH) concentrations, (2) establish an optimum AMH threshold predictive of pregnancy to first artificial insemination (P/AI), (3) examine the relationship between AMH and...

Author(s)
Gobikrushanth, M.; Purfield, D. C.; Colazo, M. G.; Butler, S. T.; Wang, Z.; Ambrose, D. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 8, pp 7563-7574
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

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

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

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 in-line milk analysis system (IMAS) is an automated biosensor technology that samples and quantifies milk progesterone concentrations (P4c) at frequent intervals starting early postpartum until pregnancy. The objective was to validate the use of pregnancy notifications (PregN) generated by an...

Author(s)
Bruinjé, T. C.; Ambrose, D. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 4, pp 3615-3621
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

The main objectives of this study were to determine the influence of diets enriched in α-linolenic, linoleic or oleic acid on the development and transcriptomic profile of embryos collected from dairy cattle. Non-lactating Holstein cows received one of the three diets supplemented with 8% rolled...

Author(s)
Salehi, R.; Colazo, M. G.; Tsoi, S.; Behrouzi, A.; Tsang, B. K.; Dyck, M. K.; Oba, M.; Ambrose, D. J.
Publisher
BioScientifica Ltd, Bristol, UK
Citation
Reproduction, 2016, 152, 6, pp 715-726

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