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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 objective of this study was to evaluate the incidence of repeat breeder (RB) in crossbred dairy cows submitted to a timed artificial insemination (TAI) and estrous synchronization protocols. Data from 371 heifers and 997 lactating crossbred dairy cows were analyzed. Cows with more than 30 DPP...

Author(s)
Souza, F.; Cesar, J.; Carneiro, L. C.; Santos, R. M. dos
Publisher
Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, Brazil
Citation
Brazilian Journal of Veterinary Research and Animal Science, 2016, 53, 4, pp unpaginated
Abstract

The objective of this study was to evaluate the conception rate of crossbred heifers (n=50) and cows (n=50) inseminated with sexed and conventional semen between 18 and 24 hours after estrous detection. The synchronization protocol of the estrous cycle started on day zero (D0) by inserting the...

Author(s)
Peres, A. R.; Ifran, A. M.; Lima, M. R. de; Rossi, G. F.; Corrêa, R. R.; Garcia, J. M.
Publisher
Faculdade de Veterinaria, Universidade Federal Fluminense, Niterói, Brazil
Citation
Revista Brasileira de Ciência Veterinária, 2016, 23, 3/4, pp 186-190
Abstract

Resumption of ovulation after parturition is a coordinated process that involves recoupling of the GH/insulin-like growth factor 1 axis in the liver, increase in follicular development and steroidogenesis, and removal of negative feedback from estradiol in the hypothalamus. Infectious diseases and...

Author(s)
Santos, J. E. P.; Bisinotto, R. S.; Ribeiro, E. S.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 86, 1, pp 254-262
AbstractFull Text

Most fixed-time artificial insemination (FTAI) protocols utilize progesterone (P4) as a hormonal source to achieve synchronization of estrus in cattle. The use of an injectable P4 source to control estrus would be an interesting pharmacological strategy owing to the practicality of parenteral...

Author(s)
Campos, J. T.; Morotti, F.; Bergamo, L. Z.; Costa, C. B.; Seneda, M. M.
Publisher
Universidade Estadual de Londrina, Londrina, Brazil
Citation
Semina: Ciências Agrárias (Londrina), 2016, 37, 4, pp 1991-1996
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
AbstractFull Text

A field survey was conducted in peri urban and urban areas of Hyderabad city of Telangana state. The data was collected from hundred farmers selected from ten mandals by simple random sampling method for the study. The data on feeding and breeding management practices was collected by personal...

Author(s)
Sekhar, M. R.; Rajanna, N.; Mahender, M.; Satyanarayana, Ch.
Publisher
Agricultural Research Communication Centre, Karnal, India
Citation
Asian Journal of Dairy and Food Research, 2017, 36, 4, pp 269-275
Abstract

The most critical phase of pregnancy is the first three weeks following insemination. During this period about 50% of high yielding lactating cows suffer embryonic loss prior to implantation, which poses a high economic burden on dairy farmers. Early diagnosis of pregnancy in cattle is therefore...

Author(s)
Schanzenbach, C. I.; Kirchner, B.; Ulbrich, S. E.; Pfaffl, M. W.
Publisher
Public Library of Sciences (PLoS), San Francisco, USA
Citation
PLoS ONE, 2017, 12, 2, pp e0172220
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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