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Abstract

Despite the widespread adoption of hormonal synchronization protocols that allow for timed artificial insemination (AI), detection of estrus plays an important role in the reproductive management program on most dairies in the United States. Increased physical activity is a secondary sign of estrus ...

Author(s)
Fricke, P. M.; Carvalho, P. D.; Giordano, J. O.; Valenza, A.; Lopes, G., Jr.; Amundson, M. C.
Publisher
Cambridge University Press, Cambridge, UK
Citation
Animal, 2014, 8, s1, pp 134-143
Abstract

Lactating dairy cows (n=1,025) on a commercial dairy farm were randomly assigned at 10±3 d in milk (DIM) to 1 of 3 treatments for submitting cows to first artificial insemination (AI) and were fitted with activity-monitoring tags (Heatime; SCR Engineers Ltd., Netanya, Israel) at 24±3 DIM. Cows...

Author(s)
Fricke, P. M.; Giordano, J. O.; Valenza, A.; Lopes, G., Jr.; Amundson, M. C.; Carvalho, P. D.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2014, 97, 5, pp 2771-2781
Abstract

The objective was to determine the effect of exogenous progesterone (P4) in a timed artificial insemination (TAI) protocol initiated at 2 different times post-AI on pregnancies per AI (P/AI) in lactating dairy cows. Cows (n=1,982) in 5 dairy herds were assigned randomly at a nonpregnancy diagnosis...

Author(s)
Bilby, T. R.; Bruno, R. G. S.; Lager, K. J.; Chebel, R. C.; Moraes, J. G. N.; Fricke, P. M.; Lopes, G., Jr.; Giordano, J. O.; Santos, J. E. P.; Lima, F. S.; Stevenson, J. S.; Pulley, S. L.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2013, 96, 11, pp 7032-7042
Abstract

Lactating Holstein cows (n=1,456) were randomized in a 2×2 factorial design to compare the main effects of day of initiation of resynchronization after artificial insemination (AI; 32 vs. 39 d) and presynchronization with GnRH 7 d before initiation of resynchronization on fertility to timed AI...

Author(s)
Lopes, G., Jr.; Giordano, J. O.; Valenza, A.; Herlihy, M. M.; Guenther, J. N.; Wiltbank, M. C.; Fricke, P. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2013, 96, 6, pp 3788-3798
Abstract

The objectives of the current experiment were to evaluate the reproductive performance and economic outcome of 3 synchronization strategies for first artificial insemination (AI) of dairy heifers. Holstein heifers from 2 herds (site A, California, n=415; site B, Idaho, n=425) were assigned to 1 of...

Author(s)
Lopes, G., Jr.; Johnson, C. R.; Mendonça, L. G. D.; Silva, P. R. B.; Moraes, J. G. N.; Ahmadzadeh, A.; Dalton, J. C.; Chebel, R. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2013, 96, 3, pp 1612-1622
Abstract

The objectives of this experiment were to determine the speed at which cows that had their estrous cycle presynchronized with a GnRH or PGF injection are reinseminated and become pregnant. Furthermore, this experiment aimed to determine whether treatment with a controlled internal drug-releasing...

Author(s)
Chebel, R. C.; Scanavez, A. A.; Silva, P. R. B.; Moraes, J. G. N.; Mendonça, L. G. D.; Lopes, G., Jr.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2013, 96, 2, pp 1009-1020
Abstract

Two experiments were conducted to evaluate an accelerometer system (Heatime; SCR Engineers Ltd., Netanya, Israel) to manage reproduction in lactating dairy cows. In experiment 1, lactating Holstein cows (n=112) were fitted with an accelerometer system and were treated with GnRH followed 7 d later...

Author(s)
Valenza, A.; Giordano, J. O.; Lopes, G., Jr.; Vincenti, L.; Amundson, M. C.; Fricke, P. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2012, 95, 12, pp 7115-7127
Abstract

Our objectives were to (1) compare the effect on pregnancies per artificial insemination (P/AI) of presynchronization of the estrous cycle with human chorionic gonadotropin (hCG) 7 d before resynchronization of ovulation (Resynch) initiated 25 d after timed artificial insemination (TAI) and compare ...

Author(s)
Giordano, J. O.; Wiltbank, M. C.; Guenther, J. N.; Ares, M. S.; Lopes, G., Jr.; Herlihy, M. M.; Fricke, P. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2012, 95, 10, pp 5612-5625
Abstract

The objectives were to evaluate the pattern of re-insemination, pregnancy outcomes to re-insemination in estrus and at fixed time, and economic outcomes of lactating Holstein cows submitted to three resynchronization protocols. Cows were enrolled in the Experiment at 32±3 d after pre-enrollment ...

Author(s)
Mendonça, L. G. D.; Dewey, S. T.; Lopes, G., Jr.; Rivera, F. A.; Guagnini, F. S.; Fetrow, J. P.; Bilby, T. R.; Chebel, R. C.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2012, 77, 6, pp 1151-1158
Abstract

Objectives were to determine the effect of progesterone (P4) concentration on fertility of lactating dairy cows induced to ovulate follicles of the first follicular wave. Lactating dairy cows (n=989) at 38±3 d postpartum were balanced by parity and body condition score and randomly assigned to 3...

Author(s)
Denicol, A. C.; Lopes, G., Jr.; Mendonça, L. G. D.; Rivera, F. A.; Guagnini, F.; Perez, R. V.; Lima, J. R.; Bruno, R. G. S.; Santos, J. E. P.; Chebel, R. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2012, 95, 4, pp 1794-1806

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