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Abstract

Increasing use of fixed-time artificial insemination (FTAI) in beef cattle production has presented an opportunity for the use of fresh or chilled semen as an alternative to standard cryopreserved semen. The objective of this study was to examine in vitro sperm function and pregnancy rate of...

Author(s)
Satake, N.; Edwards, S. A. A.; Tutt, D.; McGowan, M. R.; Boe-Hansen, G. B.
Publisher
Wiley, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2018, 53, 2, pp 414-422
Abstract

Pregnancy rates (PR) to fixed-time AI (FTAI) in Brahman heifers were compared after treatment with a traditional oestradiol-based protocol (OPO-8) or a modified protocol (OPO-6) where the duration of intravaginal progesterone releasing device (IPRD) was reduced from 8 to 6 days, and the interval...

Author(s)
Edwards, S. A. A.; Boe-Hansen, G. B.; Satake, N.; Chandra, K.; McGowan, M. R.
Publisher
Elsevier B. V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2015, 160, pp 105-111
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 objective was to investigate the ovarian response of Brahman heifers to two modified ovulation synchronisation protocols developed to increase the proportion of normal synchronous ovulations. Experiment 1 characterised the growth of the ovulatory follicle in heifers (n=19) treated with an...

Author(s)
Edwards, S. A. A.; Atkinson, P. C.; Satake, N.; Boe-Hansen, G.; McGowan, M. R.
Publisher
Elsevier B. V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2014, 148, 1/2, pp 18-25
Abstract

To investigate the potential return on investment of implementing a genetic improvement program in a self-replacing commercial Brahman breeding herd, three different selection and breeding strategies were evaluated through modelling, (1) Natural mating with no genetic improvement (NATM-G), (2)...

Author(s)
Edwards, S. A. A.; Burns, B. M.; Allen, J.; McGowan, M. R.
Publisher
Association for the Advancement of Animal Breeding and Genetics, Armidale, Australia
Citation
Proceedings of the Twentieth Conference of the Association for the Advancement of Animal Breeding and Genetics, Translating Science into Action, Napier, New Zealand, 20th-23rd October 2013, 2013, pp 90-93
Abstract

The aim of this study was to investigate the effects on follicle stimulating hormone (FSH) secretion and dominant follicle (DF) growth, of treatment of Bos indicus heifers with different combinations of intra-vaginal progesterone releasing devices (IPRD), oestradiol benzoate (ODB), PGF and eCG....

Author(s)
Edwards, S. A. A.; Phillips, N. J.; Boe-Hansen, G. B.; Bo, G. A.; Burns, B. M.; Dawson, K.; McGowan, M. R.
Publisher
Elsevier Ltd, Oxford, UK
Citation
Animal Reproduction Science, 2013, 137, 3/4, pp 129-136
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

The objectives were: (i) improve understanding of the ovarian responses of Bos indicus heifers treated with different ovulation synchronisation protocols, (ii) compare ovarian responses of B. indicus heifers treated with intravaginal progesterone releasing device (IPRD) + oestradiol benzoate (ODB)...

Author(s)
Butler, S. A. A.; Phillips, N. J.; Boe-Hansen, G. B.; Bo, G. A.; Burns, B. M.; Dawson, K.; McGowan, M. R.
Publisher
Elsevier Ltd, Oxford, UK
Citation
Animal Reproduction Science, 2011, 129, 3/4, pp 118-126
Abstract

Contents: The study tested the hypothesis that reduced intravaginal implant progesterone (P4) concentration to synchronise oestrus would increase pregnancy rates to fixed-time artificial insemination (FTAI) in Bos indicus heifers. Brahman heifers (n=294; 2 year) were body condition scored (BCS),...

Author(s)
Phillips, N. J.; Fordyce, G.; Burns, B.; Williams, P.; Mayer, D.; Bo, G.; McGowan, M. R.
Publisher
Blackwell Publishing, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2010, 45, 6, pp e392-e397
Abstract

Two studies were conducted to assess the performance of a commercially available neck-mounted activity meter to detect cows about to ovulate in two paddock-based Holstein-Friesian dairy herds. The activity monitoring system recorded cow activity count in 2-hourly periods. Study I investigated the...

Author(s)
Hockey, C. D.; Morton, J. M.; Norman, S. T.; McGowan, M. R.
Publisher
Blackwell Publishing, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2010, 45, 5, pp e107-e117

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