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Abstract

Fixed-time artificial insemination (FTAI) has been regarded as the most useful method to increase the number of cows inseminated in a given herd. The main treatments for FTAI in beef cattle are based on the use of progesterone-releasing devices and GnRH or estradiol to synchronize follicle wave...

Author(s)
Bó, G. A.; Mata, J. J. de la; Baruselli, P. S.; Menchaca, A.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 86, 1, pp 388-396
Abstract

The main objective of the implementation of artificial insemination (AI) in cattle is to produce a sustained genetic progress in the herd. Although AI is an old reproductive biotechnology, its widespread implementation is very recent and is mainly because of the use of protocols that allows AI...

Author(s)
Bó, G. A.; Baruselli, P. S.
Publisher
Cambridge University Press, Cambridge, UK
Citation
Animal, 2014, 8, s1, pp 144-150
Abstract

Compared to Bos taurus breeds, Bos indicus breeds of cattle present several differences in reproductive physiology. Follicular diameter at deviation and at the time of ovulatory capability are smaller in B. indicus breeds. Furthermore, B. indicus breeds have a greater sensitivity to gonadotropins,...

Author(s)
Baruselli, P. S.; SáFilho, M. F. de; Martins, C. M.; Nasser, L. F.; Nogueira, M. F. G.; Barros, C. M.; Bó, G. A.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2006, 65, 1, pp 77-88
Abstract

This study compared pregnancy rates (PRs) and costs per calf born after fixed-time artificial insemination (FTAI) or AI after estrus detection (i.e., estrus detection and AI, EDAI), before and after a single PGF2α treatment in Bos indicus (Brahman-cross) heifers. On Day 0, the body weight, body...

Author(s)
Edwards, S. A. A.; Bo, G. A.; Chandra, K. A.; Atkinson, P. C.; McGowan, M. R.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2015, 83, 1, pp 114-120
Abstract

The development of treatments that control follicular wave dynamics during the bovine oestrous cycle has resulted in interesting possibilities for the precise control of follicular wave emergence and the time of ovulation. For superstimulation, follicular wave emergence can be controlled by...

Author(s)
Bó, G. A.; Baruselli, P. S.; Chesta, P. M.; Martins, C. M.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2006, 65, 1, pp 89-101
Abstract

Currently, timed ovulation induction and fixed-time artificial insemination (FTAI) in superstimulated donors and synchronization protocols for fixed-time embryo transfer (FTET) in recipients can be performed using GnRH or estradiol plus progesterone/progestin (P4)-releasing devices and...

Author(s)
Baruselli, P. S.; Ferreira, R. M.; Sales, J. N. S.; Gimenes, L. U.; SáFilho, M. F.; Martins, C. M.; Rodrigues, C. A.; Bó, G. A.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2011, 76, 9, pp 1583-1593
Abstract

The present study aimed to evaluate the efficacy of different inducers of new follicular wave emergence (FWE) and ovulation in fixed-time artificial insemination (FTAI) synchronization protocols using norgestomet ear implants (NORG) in Bos indicus cattle. In Experiment 1, the synchronization of FWE ...

Author(s)
SáFilho, M. F.; Baldrighi, J. M.; Sales, J. N. S.; Crepaldi, G. A.; Carvalho, J. B. P.; Bó, G. A.; Baruselli, P. S.
Publisher
Elsevier Ltd, Oxford, UK
Citation
Animal Reproduction Science, 2011, 129, 3/4, pp 132-139
Abstract

Two experiments were conducted to investigate the effects of equine chorionic gonadotropin (eCG) at progestin removal and gonadotropin-releasing hormone (GnRH) at timed artificial insemination (TAI) on ovarian follicular dynamics (Experiment 1) and pregnancy rates (Experiment 2) in suckled Nelore (...

Author(s)
SáFilho, M. F.; Ayres, H.; Ferreira, R. M.; Marques, M. O.; Reis, E. L.; Silva, R. C. P.; Rodrigues, C. A.; Madureira, E. H.; Bó, G. A.; Baruselli, P. S.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2010, 73, 5, pp 651-658
Abstract

The objective was to determine whether eCG in an ovulation synchronization protocol with an intravaginal progesterone (P4)-releasing device (IPRD) containing a low dose of P4 improves pregnancy rate (PR) to fixed-time AI (FTAI) in Bos indicus heifers. Day 0, 2 y old Brahman heifers were allocated...

Author(s)
Butler, S. A. A.; Atkinson, P. C.; Boe-Hansen, G. B.; Burns, B. M.; Dawson, K.; Bo, G. A.; McGowan, M. R.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2011, 76, 8, pp 1416-1423
Abstract

Greater milk production in modern dairy cattle has led to greater nutritional needs, increased rates of post-partum anoestrus, reduced oestrus detection rates, lower conception and pregnancy rates and a higher incidence of embryonic mortality. In addition, larger herds have resulted in management...

Author(s)
Bó, G. A.; Mapletoft, R. J.
Publisher
British Cattle Veterinary Association, Quedgeley, UK
Citation
Cattle Practice, 2012, 20, 1, pp 19-28

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