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Abstract

The objective of this study was to evaluate protocols for synchronizing ovulation in beef cattle. In experiment 1, Nelore cows (Bos indicus) at random stages of the oestrous cycle were assigned to 1 of the following treatment groups: (1) GP controls (non-lactating, n = 7) received GnRH agonist...

Author(s)
Barros, C. M.; Moreira, M. B. P.; Figueiredo, R. A.; Teixeira, A. B.; Trinca, L. A.
Citation
Theriogenology, 2000, 53, 5, pp 1121-1134
Abstract

The present work evaluated the low cost of timed artificial insemination (TAI) in beef cattle. In Experiment 1, cycling nonlactating Nelore cows (Bos indicus, n=98) were assigned to the following groups: GnRH-PGF (GP) and GnRH-PGF-GnRH (GPG), whereas cycling (n=328, Experiment 2) or anoestrus...

Author(s)
Fernandes, P.; Teixeira, A. B.; Crocci, A. J.; Barros, C. M.
Publisher
Elsevier Science Inc., New York, USA
Citation
Theriogenology, 2001, 55, 7, pp 1521-1532
Abstract

Author(s)
Thatcher, W. W.; Bartolome, J. A.; Sozzi, A.; Silvestre, F.; Santos, J. E. P.
Publisher
Kluwer Academic Publishers, Dordrecht, Netherlands
Citation
Veterinary Research Communications, 2004, 28, suppl 1, pp 111-119
Abstract

The objective was to compare pregnancy rates and pregnancy losses in lactating dairy cows that were diagnosed not pregnant and re-inseminated following either the Ovsynch® or Heatsynch protocols. Also evaluated were the effects of stages of the estrous cycle, ovarian cysts and anestrus on pregnancy ...

Author(s)
Bartolome, J. A.; Silvestre, F. T.; Kamimura, S.; Arteche, A. C. M.; Melendez, P.; Kelbert, D.; McHale, J.; Swift, K.; Archbald, L. F.; Thatcher, W. W.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2005, 63, 6, pp 1617-1627
Abstract

Pregnancy rates were compared in lactating dairy cows (n=1083) assigned to protocols for resynchronization of ovulation based on stages of the estrous cycle, or presence of ovarian cysts or anestrus. Cows were detected not pregnant by ultrasonography 30 d after a previous AI (study day 0) and...

Author(s)
Bartolome, J. A.; Sozzi, A.; McHale, J.; Melendez, P.; Arteche, A. C. M.; Silvestre, F. T.; Kelbert, D.; Swift, K.; Archbald, L. F.; Thatcher, W. W.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2005, 63, 6, pp 1628-1642
Abstract

The objective was to compare pregnancy rates to resynchronization and timed AI (TAI) protocols in lactating dairy cows that received GnRH at 23 d and were diagnosed not pregnant at 30 d after the pre-enrollment AI. Nonpregnant cows (624) at ultrasonography on day 30 (study day 0) were classified as ...

Author(s)
Bartolome, J. A.; Sozzi, A.; McHale, J.; Swift, K.; Kelbert, D.; Archbald, L. F.; Thatcher, W. W.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2005, 63, 6, pp 1643-1658
Abstract

One aim of this study was to compare the reproductive performance of cows and heifers when resynchronizing returns to oestrus for a second insemination by treating with an intravaginal progesterone-releasing device (IVD) for 7 or 8 d when estradiol benzoate (EB) was administered at the start of...

Author(s)
Cavalieri, J.; Hepworth, G.; Smart, V. M.; Ryan, M.; Macmillan, K. L.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2007, 67, 4, pp 824-834
Abstract

The aim of the current work was to analyze the features of ovarian follicular population and their quality in New Zealand white rabbit does synchronized by 24-h controlled doe-litter separation before artificial insemination (AI) during all their reproductive cycles. Synchronized animals were...

Author(s)
Garcia-Garcia, R. M.; Arias-Alvarez, M.; Rebollar, P. G.; Revuelta, L.; Lorenzo, P. L.
Publisher
Elsevier, Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2009, 114, 4, pp 423-433
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

Reduced reproductive efficiency has been reported in high-producing dairy cows. Sources of reproductive inefficiency include decreased expression of estrus, increased diameter of the ovulatory follicle and reduced fertility when cows are inseminated after estrus, increased incidence of double...

Author(s)
Wiltbank, M. C.; Sartori, R.; Vasconcelos, J. L. M.; Nascimento, A. B.; Souza, A. H.; Cunha, A. P.; Gumen, A.; Sangsritavong, S.; Guenther, J. N.; Lopez, H.; Pursley, J. R.
Publisher
Nottingham University Press, Nottingham, UK
Citation
Reproduction in domestic ruminants VII. Proceedings of the Eighth International Symposium on Reproduction in Domestic Ruminants, Anchorage, Alaska, September 2010, 2010, pp 231-245

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