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Abstract

The objective of this study was to determine the relative importance and contribution of several physiological factors as predictors of pregnancy risk in an Ovsynch (GnRH-1-7 d-PGF-56 h-GnRH-2-16 h-artificial insemination) timed artificial insemination program: (1) age of the corpus luteum (CL;...

Author(s)
Stevenson, J. S.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 12, pp 10077-10092
Abstract

The objectives of the experiments were to compare ovarian responses, pregnancy per artificial insemination, and pattern of insemination of 2 estrus detection-based presynchronization protocols before first artificial insemination (AI) during heat stress. In experiment 1, primiparous lactating dairy ...

Author(s)
Voelz, B. E.; Rocha, L.; Scortegagna, F.; Stevenson, J. S.; Mendonça, L. G. D.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 9, pp 7612-7623
Abstract

Timed artificial insemination (AI) programs are commonly used in the dairy industry for lactating cows, but less so in replacement heifers. Excellent programs using combinations of prostaglandin F and gonadotropin-releasing hormone in protocols relying on timed AI without detection of estrus or...

Author(s)
Stevenson, J. S.
Publisher
Saunders, An Imprint of Elsevier, Philadelphia, USA
Citation
Veterinary Clinics of North America, Food Animal Practice, 2016, 32, 2, pp 349-364
Abstract

Two experiments were conducted to determine relationships of blood metabolite concentrations, BW, BCS, and rump fat depth with postpartum ovulation and pregnancy risks, as well as their utility in predicting those outcomes in suckled beef cows. In experiment 1, plasma glucose collected 10 and 3 d...

Author(s)
Hill, S. L.; Olson, K. C.; Jaeger, J. R.; Stevenson, J. S.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2018, 96, 1, pp 258-272
Abstract

Two experiments were performed to test the hypothesis that administering PGF concurrent with timed artificial insemination (AI) in lactating dairy cows would enhance pregnancy per AI (P/AI). In experiment 1, lactating Holstein cows (n=289) in one herd were enrolled after a non-pregnancy diagnosis ...

Author(s)
Sauls, J. A.; Voelz, B. E.; Mendonça, L. G. D.; Stevenson, J. S.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2018, 110, pp 27-33
Abstract

We hypothesized (1) that neither duration of the Ovsynch program nor dose frequency of PGF would change the proportion of cows with complete luteolysis (progesterone <0.4 ng/mL 72 h after PGF) and (2) that the additional GnRH treatment administered as part of a presynchronization program would not alter the proportion...

Author(s)
Stevenson, J. S.; Sauls, J. A.; Mendonça, L. G. D.; Voelz, B. E.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 10, pp 9575-9590
Abstract

Our objective was to determine which of 2 split-time AI programs applied to suckled beef cows would result in greater pregnancy risk. Suckled beef cows (n=1,062) at 12 locations in 4 states (CO, KS, MY, and WA) were enrolled. Cows were treated on d -7 with a progesterone insert concurrent with 100...

Author(s)
Stevenson, J. S.; Hill, S. L.; Grieger, D. M.; Olson, K. C.; Jaeger, J. R.; Ahola, J.; Seidel, G. E.; Kasimanickam, R. K.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2017, 95, 11, pp 5105-5111
Abstract

The objective was to determine the benefit of including GnRH and PGF (PG) as a part of a presynchronization option before enrolling cows in a timed artificial insemination (AI) program. Holstein cows in one herd were assigned weekly at calving from January 2012 to August 2014 to a completely...

Author(s)
Stevenson, J. S.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 85, 6, pp 1139-1146
Abstract

An experiment was conducted with the objective to determine the effects of estradiol, progesterone, presence of a corpus luteum (CL), and size of a dominant follicle on the characteristics and patterns of GnRH-induced LH release and subsequent ovulation during a timed artificial insemination (TAI)...

Author(s)
Stevenson, J. S.; Pulley, S. L.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 4, pp 3003-3015
Abstract

Using 1 market-available activity monitor, 3 experiments were conducted in dairy cows to determine timing of ovulation, compare within-herd conception risk of cows inseminated based on activity monitors versus timed artificial insemination (AI), and determine conception risk of cows inseminated at...

Author(s)
Stevenson, J. S.; Hill, S. L.; Nebel, R. L.; DeJarnette, J. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2014, 97, 7, pp 4296-4308

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