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Animal Science Database

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Abstract

Two experiments evaluated long-term progestin-based estrus-synchronization programs on the basis of potential for use in facilitating fixed-time AI in estrous cycling and prepubertal beef heifers. In Exp. 1, heifers were assigned to 1 of 2 treatments by age, BW, and estrous cyclicity status....

Author(s)
Mallory, D. A.; Wilson, D. J.; Busch, D. C.; Ellersieck, M. R.; Smith, M. F.; Patterson, D. J.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2010, 88, 11, pp 3568-3578
Abstract

This experiment was designed to compare pregnancy rates in postpartum beef cows resulting from fixed-time AI (FTAI) after treatment with 1 of 2 protocols to synchronize estrus and ovulation. Cross-bred, suckled beef cows (n=650) at 4 locations (n=210; n=158; n=88; and n=194) were assigned within a...

Author(s)
Schafer, D. J.; Bader, J. F.; Meyer, J. P.; Haden, J. K.; Ellersieck, M. R.; Lucy, M. C.; Smith, M. F.; Patterson, D. J.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2007, 85, 8, pp 1940-1945
Abstract

Two progestin-based protocols for oestrus synchronization in postpartum beef cows were compared following treatment administration on the basis of oestrous response, interval to and synchrony of oestrus, and pregnancy. Cows were assigned to one of the two treatment protocols by age, body condition...

Author(s)
Stegner, J. E.; Kojima, F. N.; Ellersieck, M. R.; Lucy, M. C.; Smith, M. F.; Patterson, D. J.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2004, 82, 4, pp 1016-1021