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Animal Science Database

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Abstract

The effects of extended progestin exposure, gonadotropin-releasing hormone (GnRH) versus prostaglandin (PG) F at controlled internal drug-release (CIDR) insertion, and GnRH on d 7 versus 9 of a 14-d CIDR on ovarian response and timed AI (TAI) pregnancy rate were evaluated. In Exp. 1 beef heifers...

Author(s)
French, J. T.; Ahola, J. K.; Whittier, J. C.; Giles, R. L.; Repenning, P. E.; Seidel, G. E., Jr.; Peel, R. K.
Publisher
American Registry of Professional Animal Scientists (ARPAS), Champaign, USA
Citation
Professional Animal Scientist, 2013, 29, 1, pp 64-74
Abstract

The aim of the present study was to evaluate the effects of the PGF treatment given at the onset of a synchronization of ovulation protocol using a norgestomet (NORG) ear implant on ovarian follicular dynamics (Experiment 1) and pregnancy per AI (P/AI; Experiment 2) in cyclic (CL present) Bos...

Author(s)
SáFilho, M. F.; Marques, M. O.; Gimenes, L. U.; Torres Júnior, J. R. S.; Batista, E. O. S.; Carvalho, J. P. B.; Baruselli, P. S.
Publisher
Elsevier B. V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2014, 144, 1/2, pp 1-5
Abstract

Results of clinical experiments show that it is possible to unify intervals from a PGF application to LH peak then to ovulation. In a field experiment, fixed time insemination was tested on the basis of data from clinical experiments. Synchronized heifers and high yielding cows received GnRH 65...

Author(s)
Becker, F.; Göllnitz, K.; Alm, H.; Schneider, F.; Nehring, H.; Kanitz, W.
Publisher
Institute for Animal Husbandry, Belgrade, Yugoslavia
Citation
Biotechnology in Animal Husbandry, 2003, 19, 5/6, pp 41-47
Abstract

Progesterone-containing devices can be inserted intravaginally for 14 d to presynchronize the estrous cycle for timed artificial insemination (TAI) in beef heifers ("14-day CIDR-PG" or "Show-Me-Synch" program). The progesterone treatment is effective for presynchronization because cattle develop a...

Author(s)
Escalante, R. C.; Poock, S. E.; Mathew, D. J.; Martin, W. R.; Newsom, E. M.; Hamilton, S. A.; Pohler, K. G.; Lucy, M. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2012, 95, 9, pp 5102-5108
Abstract

Our objectives were to identify stages of the oestrous cycle at which initiation of a timed artificial insemination (Ovsynch/TAI) protocol may reduce pregnancy rates and to monitor ovarian follicle dynamics and corpus luteum (CL) development after initiation of the Ovsynch/TAI protocol at different ...

Author(s)
Moreira, F.; Sota, R. L. de la; Diaz, T.; Thatcher, W. W.
Citation
Journal of Animal Science, 2000, 78, 6, pp 1568-1576
Abstract

Two experiments evaluated long-term controlled internal drug release (CIDR) insert-based protocols to synchronize estrus and compare differences in their potential ability to facilitate fixed-time artificial insemination (FTAI) in beef heifers. In Experiment 1 estrous cycling heifers (n=85) were...

Author(s)
Leitman, N. R.; Busch, D. C.; Mallory, D. A.; Wilson, D. J.; Ellersieck, M. R.; Smith, M. F.; Patterson, D. J.
Publisher
Elsevier, Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2009, 114, 4, pp 345-355
Abstract

The objective of this study was to determine the effects of low versus physiologic plasma progesterone concentrations during the ovulatory wave on fertility in cattle. Suckled beef cows (Bos taurus; n=129) and pubertal heifers (Bos taurus; n=150) at random stages of the estrous cycle were given a...

Author(s)
Pfeifer, L. F. M.; Mapletoft, R. J.; Kastelic, J. P.; Small, J. A.; Adams, G. P.; Dionello, N. J.; Singh, J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2009, 72, 9, pp 1237-1250
Abstract

In an experiment involving 277 cycling females , the females were injected with 5 mg Alfaprostol (a PGF2 alpha analogue) during spring 1979 or with 1.5 mg Alfaprostol/kg body weight during winter 1979/80. In both seasons, the females were treated according to 1 of 3 regimes: (1) 2 injections with...

Author(s)
Jochle, W.; Kuzmanov, D.; Vujosevic, J.
Citation
Theriogenology, 1982, 18, 2, pp 215-225

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