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Abstract

Progesterone profiles in Norwegian Red cows were categorized, and associations between the occurrence of irregularities in the profiles and the commencement of luteal activity were investigated. The cows were managed in 3 feeding trials from 1994 to 2001 and from 2005 to 2008 at the Norwegian...

Author(s)
Garmo, R. T.; Martin, A. D.; Thuen, E.; Havrevoll, Ø.; Steinshamn, H.; Prestløkken, E.; Randby, Ǻ.; Eknæs, M.; Waldmann, A.; Reksen, O.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2009, 92, 10, pp 4919-4928
Abstract

The objectives of this study were to evaluate the effect of administering 500 mg of recombinant bovine somatotropin (bST) every 10 d on ovulatory responses, estrous behavior, and fertility of lactating Holstein cows. Lactating dairy cows were assigned to 1 of 2 treatments: a control with no...

Author(s)
Rivera, F.; Narciso, C.; Oliveira, R.; Cerri, R. L. A.; Correa-Calderón, A.; Chebel, R. C.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 4, pp 1500-1510
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

Objectives were to determine effects of lactation and pregnancy on endometrial gene expression on d 17 of the estrous cycle and pregnancy. Heifers (n=33) were assigned randomly after parturition to lactating (L, n=17) or nonlactating (NL, n=16) groups. Cows were subjected to an ovulation...

Author(s)
Cerri, R. L. A.; Thompson, I. M.; Kim, I. H.; Ealy, A. D.; Hansen, P. J.; Staples, C. R.; Li, J. L.; Santos, J. E. P.; Thatcher, W. W.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2012, 95, 10, pp 5657-5675
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

The objective of this study was to compare the reproductive performance of lactating dairy cows using a treatment (TRT) program for second and subsequent artificial insemination (AI) services aimed at (1) increasing AI upon estrus detection based on increased physical activity (AIAct) and (2)...

Author(s)
Giordano, J. O.; Stangaferro, M. L.; Wijma, R.; Chandler, W. C.; Watters, R. D.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2015, 98, 4, pp 2488-2501
Abstract

The objectives of this experiment were to determine the effects of oral Ca supplementation on milk yield, body condition, pregnancy per artificial insemination (P/AI), and days to pregnancy in Holstein cows considered to be of low (LRM; no calving assistance, live singleton without retained...

Author(s)
Martinez, N.; Sinedino, L. D. P.; Bisinotto, R. S.; Daetz, R.; Risco, C. A.; Galvão, K. N.; Thatcher, W. W.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 10, pp 8417-8430
Abstract

This experiment evaluated the reproductive performance, herd exit dynamics, and lactation performance of dairy cows managed with a voluntary waiting period (VWP) of 60 or 88 d. Secondary objectives were evaluating VWP effect on cyclicity status, uterine health, systemic inflammation, and body...

Author(s)
Stangaferro, M. L.; Wijma, R.; Masello, M.; Thomas, M. J.; Giordano, J. O.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 1, pp 717-735
Abstract

The aim of this study was to quantify the effects of progesterone profile features and other cow-level factors on insemination success to provide a real-time predictor equation of probability of insemination success. Progesterone profiles from 26 dairy herds were analyzed and the effects of profile ...

Author(s)
Blavy, P.; Friggens, N. C.; Nielsen, K. R.; Christensen, J. M.; Derks, M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 2, pp 1648-1660

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