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Animal Science Database

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Abstract

Our objective was to assess the effects of progesterone before initiating an estrus- or ovulation-synchronization program in addition to the influence of parity, BCS, and days postpartum on resulting pregnancy rates per AI. Experimental data were combined from 73 herd-year studies consisting of...

Author(s)
Stevenson, J. S.; Hill, S. L.; Bridges, G. A.; Larson, J. E.; Lamb, G. C.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2015, 93, 5, pp 2111-2123
Abstract

The objective was to test potential presynchronization programs applied to cows before a timed artificial insemination (TAI) program to increase the percentage of cows ovulating in response to both GnRH injections of a TAI program and having a functional corpus luteum before the first GnRH...

Author(s)
Stevenson, J. S.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2011, 94, 1, pp 205-217
Abstract

The objective was to monitor changes in ovarian status in heifers exposed to a progesterone insert with or without concurrent GnRH injection. oestrus was manipulated in 283 heifers (31 breeding clusters) by administering GnRH, progesterone, and PGF at 5 stages of the oestrus cycle. oestrus was...

Author(s)
Stevenson, J. S.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2008, 91, 12, pp 4640-4650
Abstract

We determined whether a fixed-time AI (TAI) protocol could yield pregnancy rates similar to a protocol requiring detection of estrus, or estrous detection plus TAI, and whether adding a controlled internal device release (CIDR) to GnRH-based protocols would enhance fertility. Estrus was...

Author(s)
Larson, J. E.; Lamb, G. C.; Stevenson, J. S.; Johnson, S. K.; Day, M. L.; Geary, T. W.; Kesler, D. J.; DeJarnette, J. M.; Schrick, F. N.; DiCostanzo, A.; Arseneau, J. D.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2006, 84, 2, pp 332-342
Abstract

A controlled field study examined conception rates after 2 timed artificial insemination (TAI) breeding protocols conducted on 2 commercial dairy farms. Estrous cycles in postpartum lactating cows were presynchronized with 2 injections of PGF2α given 14 d apart (Pre-synch) and then, after 12 d, the ...

Author(s)
Stevenson, J. S.; Phatak, A. P.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2005, 88, 1, pp 399-405
Abstract

Two experiments examined pregnancy after synchronized ovulation (Ovsynch) with or without progesterone (P4) administered via controlled internal drug release (CIDR) intravaginal inserts. In experiment 1, 262 lactating cows in one herd were in 3 treatments: Ovsynch (n=91), Ovsynch+CIDR (n=91), and...

Author(s)
El-Zarkouny, S. Z.; Cartmill, J. A.; Hensley, B. A.; Stevenson, J. S.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2004, 87, 4, pp 1024-1037
Abstract

Cows (n=188; average initial BW=579±54 kg) were stratified by BCS and BW and assigned to 3 supplementation treatments: whole raw soybeans (21.6% fat), whole fuzzy cottonseed (21.7% fat), or a 50:50 mixture of ground corn and soybean meal (2.6% fat; i.e., the control supplement). Supplements were...

Author(s)
Thomas, M. D.; Olson, K. C.; Stevenson, J. S.; Jaeger, J. R.; Bolte, J. W.; Sproul, N. A.; Linden, D. A.; Pacheco, L. A.
Publisher
American Registry of Professional Animal Scientists (ARPAS), Illinois, USA
Citation
Professional Animal Scientist, 2009, 25, 1, pp 41-48
Abstract

Our objective was to evaluate the effects of pre- and postpartum bolus injections of a trace mineral solution on reproductive performance, BW change, and BCS change of beef cows and on growth of suckling calves. Mature beef cows (n=460; initial BW=497±89 kg, initial BCS=5.4±0.74) managed in 2...

Author(s)
Mundell, L. R.; Jaeger, J. R.; Waggoner, J. W.; Stevenson, J. S.; Grieger, D. M.; Pacheco, L. A.; Bolte, J. W.; Aubel, N. A.; Eckerle, G. J.; Macek, M. J.; Ensley, S. M.; Havenga, L. J.; Olson, K. C.
Publisher
American Registry of Professional Animal Scientists (ARPAS), Champaign, USA
Citation
Professional Animal Scientist, 2012, 28, 1, pp 82-88
Abstract

Our objectives were to determine pregnancy rates after altering times of the second GnRH injection, insemination, or both in a combined Presynch+Ovsynch protocol, to accommodate once-daily lockup of dairy cows. Lactating dairy cows (n=665) from 2 dairy herds in northeastern Kansas were studied....

Author(s)
Portaluppi, M. A.; Stevenson, J. S.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2005, 88, 3, pp 914-921

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