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Animal Science Database

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Abstract

The objective of this review is to integrate strategies to optimize an ovulatory control program which then serves as a platform to improve the reproductive performance of lactating dairy cows. Programmed management of follicle growth, regression of the CL and induction of ovulation led to...

Author(s)
Thatcher, W. W.; Santos, J. E. P.
Publisher
Nottingham University Press, Nottingham, UK
Citation
Reproduction in domestic ruminants VI. Proceedings of the Seventh International Symposium on Reproduction in Domestic Ruminants, Wellington, New Zealand, 13-17 August, 2006, 2007, pp 69-81
Abstract

Our objectives were to identify stages of the oestrous cycle at which initiation of a timed artificial insemination (Ovsynch/TAI) protocol may reduce pregnancy rates and to monitor ovarian follicle dynamics and corpus luteum (CL) development after initiation of the Ovsynch/TAI protocol at different ...

Author(s)
Moreira, F.; Sota, R. L. de la; Diaz, T.; Thatcher, W. W.
Citation
Journal of Animal Science, 2000, 78, 6, pp 1568-1576
Abstract

The objectives were to determine the effects of supplementing docosahexaenoic acid (DHA)-rich algae on reproduction of dairy cows. Holstein cows were assigned randomly to either a control (n=373) or the same diet supplemented daily with 100 g/cow of an algae product containing 10% DHA (algae, ...

Author(s)
Sinedino, L. D. P.; Honda, P. M.; Souza, L. R. L.; Lock, A. L.; Boland, M. P.; Staples, C. R.; Thatcher, W. W.; Santos, J. E. P.
Publisher
BioScientifica Ltd, Bristol, UK
Citation
Reproduction, 2017, 153, 5, pp 707-723
Abstract

Objectives were to determine the effects of GnRH at the initiation of the 5-d timed artificial insemination (AI) program combined with 2 injections of PGF on ovarian responses and pregnancy per AI (P/AI) in dairy heifers, and the role of progesterone concentrations on LH release and ovulation in...

Author(s)
Lima, F. S.; Ribeiro, E. S.; Bisinotto, R. S.; Greco, L. F.; Martinez, N.; Amstalden, M.; Thatcher, W. W.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2013, 96, 11, pp 7054-7065
Abstract

The objectives were to compare development and transcriptome of preimplantation conceptuses 15 d after synchronized ovulation and artificial insemination (AI) according to the genetic background of the cow and estrous cyclicity at the initiation of the synchronization program. On d 39±3 postpartum, ...

Author(s)
Ribeiro, E. S.; Monteiro, A. P. A.; Bisinotto, R. S.; Lima, F. S.; Greco, L. F.; Ealy, A. D.; Thatcher, W. W.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 6, pp 4761-4777
Abstract

Holstein cows received, subcutaneously 1 (1DESL, n=15) or 2 (2DESL, n=12) degradable implant containing 2.1 mg of the GnRH agonist Deslorelin or no implant (CON, n=18) within 1.5 days postpartum (dpp). Previous pregnant (PPH) and non-pregnant (PNPH) uterine horns were determined by palpation per...

Author(s)
Silvestre, F. T.; Risco, C. A.; Lopez, M.; Sá, M. J. S. de; Bilby, T. R.; Thatcher, W. W.
Publisher
Elsevier, Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2009, 116, 3/4, pp 196-212
Abstract

Objectives were to investigate 2 intervals from induction of ovulation to artificial insemination (AI) and the effect of supplemental progesterone for resynchronization on fertility of lactating dairy cows subjected to a 5-d timed AI program. In experiment 1, 1,227 Holstein cows had their estrous...

Author(s)
Bisinotto, R. S.; Ribeiro, E. S.; Martins, L. T.; Marsola, R. S.; Greco, L. F.; Favoreto, M. G.; Risco, C. A.; Thatcher, W. W.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 12, pp 5798-5808
Abstract

The objectives were to evaluate pregnancy per AI (P/AI) of dairy cows subjected to the 5-day timed AI protocol under various synchronization and luteolytic treatments. Cows were either presynchronized or received supplemental progesterone during the synchronization protocol, and received a double...

Author(s)
Ribeiro, E. S.; Bisinotto, R. S.; Favoreto, M. G.; Martins, L. T.; Cerri, R. L. A.; Silvestre, F. T.; Greco, L. F.; Thatcher, W. W.; Santos, J. E. P.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2012, 78, 2, pp 273-284
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

Objectives were to evaluate the effects of differing progesterone concentrations during follicle development on follicular dynamics, fertilization, and embryo quality. Lactating Holstein cows (n=154) were assigned randomly to 1 of 2 treatments. Cows underwent a presynchronization of the estrous...

Author(s)
Cerri, R. L. A.; Chebel, R. C.; Rivera, F.; Narciso, C. D.; Oliveira, R. A.; Thatcher, W. W.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2011, 94, 7, pp 3342-3351

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