D. Bignell
3 Papers
D. Bignell is an academic researcher. The author has contributed to research in topics: Estrus Detection & Equine chorionic gonadotropin. The author has an hindex of 2, co-authored 3 publications.
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Papers
Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semen.
M.G. Colazo,P.R Whittaker,K. Macmillan,D. Bignell,G. Boender,R. de Carvalho Guimaraes,Reuben J. Mapletoft +6 more
TL;DR: Pregnancy per AI was greater in cyclic heifers, in those inseminated with conventional semen and in those exhibiting estrus before TAI, and the usefulness of an estrus detection (ED) aid could be used to increase the adoption of this technology in beef herds.
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Comparison of the effects of two shortened timed-AI protocols on pregnancy per AI in beef cattle
K. Macmillan,M. Gobikrushanth,Albina Sanz,D. Bignell,G. Boender,L. Macrae,Reuben J. Mapletoft,M.G. Colazo +7 more
TL;DR: In summary, the J-synch protocol resulted in greater P/AI than the modified 5-day Co- synch protocol in heifers and cows.
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9 EVALUATION OF A MODIFIED GnRH-BASED TIMED ARTIFICIAL INSEMINATION PROTOCOL ASSOCIATED WITH ESTRUS DETECTION IN CYCLIC BEEF HEIFERS INSEMINATED WITH SEX-SELECTED SEMEN
TL;DR: This study compared pregnancy per TAI (P/TAI) between sex-selected and conventional semen in cyclic beef heifers subjected to the modified GnRH-based TAI protocol and evaluated the usefulness of an oestrus detection (ED) to identify heifer that were most likely to conceive.
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