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Abstract

The aim of this study was to compare pregnancy per artificial insemination (P/AI) from service sires used on artificial insemination after estrus detection (EAI) or timed artificial insemination (TAI) breedings. Confirmed artificial insemination outcome records from 3 national data centers were...

Author(s)
Batista, E. O. S.; Vieira, L. M.; SáFilho, M. F.; Carvalho, P. D.; Rivera, H.; Cabrera, V.; Wiltbank, M. C.; Baruselli, P. S.; Souza, A. H.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 3, pp 2010-2015
Abstract

Our objective was to evaluate the association between body condition score (BCS) change during the transition period with fertility, non-esterified fatty acids (NEFA) and beta-hydroxybutyrate (BHBA) concentrations, milk yield, and health problems of Holstein cows in a retrospective cohort study....

Author(s)
Barletta, R. V.; Maturana Filho, M.; Carvalho, P. D.; Valle, T. A. del; Netto, A. S.; Rennó, F. P.; Mingoti, R. D.; Gandra, J. R.; Mourão, G. B.; Fricke, P. M.; Sartori, R.; Madureira, E. H.; Wiltbank, M. C.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2017, 104, pp 30-36
Abstract

Our hypothesis was that increasing the length of an estradiol and progesterone (P4) timed artificial insemination (TAI) protocol would improve pregnancy per artificial insemination (P/AI). Lactating Holstein cows (n=759) yielding 31±0.30 kg of milk/d with a detectable corpus luteum (CL) at d -11...

Author(s)
Pereira, M. H. C.; Rodrigues, A. D. P.; Carvalho, R. J. de; Wiltbank, M. C.; Vasconcelos, J. L. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2014, 97, 3, pp 1454-1464
Abstract

Our objective was to assess the effect of treatment with human chorionic gonadotropin (hCG) 7 d after artificial insemination (AI) or at the time of in vitro-fertilized (IVF) embryo transfer on reproductive outcomes, including progesterone (P4), interferon-tau stimulated gene 15 (ISG15),...

Author(s)
Niles, A. M.; Fricke, H. P.; Carvalho, P. D.; Wiltbank, M. C.; Hernandez, L. L.; Fricke, P. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 3, pp 2593-2606
Abstract

Dry period and early post-partum management are decisive factors for fertility in lactating dairy cows. Previous studies have shown that decreased dry matter intake (DMI) and increased non-esterified fatty acids (NEFA) negatively affect fertility and subsequent milk production. The traditional dry...

Author(s)
Gumen, A.; Keskİn, A.; Yİlmazbas-Mecİtoglu, G.; Karakaya, E.; Wiltbank, M. C.
Publisher
Wiley-Blackwell, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2011, 46, s3, pp 11-17
AbstractFull Text

Efficient reproduction performance is important for optimal profitability on dairy operations. Unfortunately, most dairy farms do not attain optimal reproduction due to many factors including management, health and physiology of high-producing dairy cows. The physiology limitations involved in...

Author(s)
Nascimento, A. B. do; Souza, A. H. de; Sartori, R.; Wiltbank, M. C.
Publisher
Universidade Federal do Rio Grande do Sul, Faculdade de Veterinária, Porto Alegre, Brazil
Citation
Acta Scientiae Veterinariae, 2013, 41, pp 1130
Abstract

The main objective of this study was to evaluate the effect of a second treatment with prostaglandin F (PGF) during Ovsynch on regression of the corpus luteum (CL) and on fertility to the timed artificial insemination. Two experiments were performed. In both experiments, cows were randomized to...

Author(s)
Wiltbank, M. C.; Baez, G. M.; Cochrane, F.; Barletta, R. V.; Trayford, C. R.; Joseph, R. T.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2015, 98, 12, pp 8644-8654
Abstract

Presynchronization strategies, such as Presynch-Ovsynch and Double-Ovsynch, increase fertility to timed artificial insemination (TAI) compared with Ovsynch alone; however, simpler presynchronization strategies could reduce costs and simplify reproductive management. Lactating Holstein cows (n=601)...

Author(s)
Carvalho, P. D.; Guenther, J. N.; Fuenzalida, M. J.; Amundson, M. C.; Wiltbank, M. C.; Fricke, P. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2014, 97, 10, pp 6305-6315
Abstract

There are multiple reasons for reduced fertility in lactating dairy cows. We hypothesized that one cause of reduced fertility could be the overall size of the reproductive tract, particularly the uterus, given well-established uterine functions in many aspects of the reproductive process. Thus, the ...

Author(s)
Baez, G. M.; Barletta, R. V.; Guenther, J. N.; Gaska, J. M.; Wiltbank, M. C.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 85, 8, pp 1357-1366
Abstract

Two treatments designed to increase circulating progesterone concentration (P4) during preovulatory follicle development were compared. One treatment used 2 intravaginal P4 implants (controlled internal drug-releasing inserts; (CIDR) and the other used a GnRH treatment at beginning of the protocol. ...

Author(s)
Pereira, M. H. C.; Wiltbank, M. C.; Guida, T. G.; Lopes, F. R.; Vasconcelos, J. L. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2017, 100, 10, pp 8455-8470

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