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Abstract

A Simmental bull with a history of low fertility, both by natural service and artificial insemination, was presented for examination. Two previous semen evaluations had not revealed any specific semen abnormality that would support the breeding history. A comprehensive cytochemical analysis of the...

Author(s)
Miller, D. M.; Hrudka, F.; Cates, W. F.; Mapletoft, R. J.
Citation
Theriogenology, 1982, 17, 6, pp 611-621
Abstract

Simmental crossbred cows were injected on day 280 of pregnancy with 500 μg cloprostenol, 25 mg dexamethasone, 500 μg cloprostenol plus 25 mg dexamethasone, or saline. For the 4 groups, the number of cows calving within 72 h of treatment (number of cows treated in brackets) was 14 (16), 17 (19), 19...

Author(s)
Mapletoft, R. J.; Lewing, F.; Wilson, D. C.
Publisher
University of Illinois, Urbana, USA
Citation
10th International Congress on Animal Reproduction and Artificial Insemination, June 10-14 1984, University of Illinois at Urbana-Champaign, Illinois, USA. Volume II. Brief communications., 1984, Paper No. 105, pp 3 pp.
Abstract

Four experiments were designed to determine the optimal dose of highly purified porcine FSH (Folltropin) for superovulation in 154 beef cattle. On day 9±1 of the oestrous cycle, animals were treated with a total dose of FSH ranging from 5 to 40 mg divided into twice-daily treatments over a 4-day...

Author(s)
Mapletoft, R. J.; Wu, M.; Murphy, B. D.
Publisher
University College Dublin, Dublin, Irish Republic
Citation
11th International Congress on Animal Reproduction and Artificial Insemination, University College, Dublin, Ireland, June 26-30 1988. Volume 2. Brief Communications, 1988, No. 173, pp 3pp.
Abstract

A 2-year-old intact male purebred Shetland sheepdog was examined. It had been mated to 4 bitches of known fertility but had failed to produce a pregnancy. Despite several attempts in various ways no semen could be obtained, although anal and urethral pulsations were evident. Semen was retrieved...

Author(s)
Post, K.; Barth, A. D.; Kiefer, U. T.; Mapletoft, R. J.
Citation
Canadian Veterinary Journal, 1992, 33, 1, pp 53-55
Abstract

Research on the reproductive physiology of South American camelids is summarized and the application of new reproductive techniques to these species is reviewed. Artificial insemination, superovulation, embryo transfer and in vitro fertilization have now been succesfully applied to camelids. In...

Author(s)
Campo, M. R. del; Campo, C. H. del; Adams, G. P.; Mapletoft, R. J.
Citation
Theriogenology, 1995, 43, 1, pp 21-30
Abstract

In the 1st experiment, 18 beef heifers were assigned to non-ablation and 20 to ablation groups. In non-ablated heifers, superstimulatory treatment was given as a single subcutaneous injection (Follitropin-V, 400 mg) at mid-dioestrus to coincide with emergence of the spontaneous follicular wave 8-12 ...

Author(s)
Bergfelt, D. R.; Bo, G. A.; Mapletoft, R. J.; Adams, G. P.
Citation
Animal Reproduction Science, 1997, 49, 1, pp 1-12
Abstract

56 cows received a norgestomet implant and an injection of norgestomet and oestradiol valerate; half (n = 28) received 500 IU equine chorionic gonadotropin (eCG) at implant removal, 9 days later. A third group (n = 25) received 2 injections of cloprostenol (500 µg) 11 days apart. The percentage of...

Author(s)
Kastelic, J. P.; Olson, W. O.; Martinez, M.; Cook, R. B.; Mapletoft, R. J.
Citation
Canadian Veterinary Journal, 1999, 40, 3, pp 173-178
Abstract

A study was designed to compare superovulatory responses in cattle when gonadotropin treatment followed 1 of 3 different treatments to synchronize follicular wave emergence. Animals at unknown stages of the oestrous cycle were randomly assigned to 3 groups: ablation of the 2 largest follicles per...

Author(s)
Baracaldo, M. I.; Martinez, M. F.; Adams, G. P.; Mapletoft, R. J.
Citation
Theriogenology, 2000, 53, 6, pp 1239-1250
Abstract

Two experiments were conducted to determine oestrous response and pregnancy rate in beef cattle given a controlled internal drug release (CIDR-B) device plus PGF at CIDR-B removal, and estradiol or GnRH. In Experiment I, crossbred beef heifers received a CIDR-B device and 1 mg estradiol benzoate...

Author(s)
Martínez, M. F.; Kastelic, J. P.; Adams, G. P.; Janzen, E.; McCartney, D. H.; Mapletoft, R. J.
Publisher
Canadian Veterinary Medical Association, Ottawa, Canada
Citation
Canadian Veterinary Journal, 2000, 41, 10, pp 786-790
Abstract

The objective was to synchronize follicular wave emergence among cattle for synchronization of oestrus and ovulation, and to determine pregnancy rate after AI at observed oestrus. At random stages of the oestrous cycle, a controlled internal drug release device (CIDR-B) was inserted intravaginally...

Author(s)
Martinez, M. F.; Adams, G. P.; Kastelic, J. P.; Bergfelt, D. R.; Mapletoft, R. J.
Publisher
Elsevier Science Inc., New York, USA
Citation
Theriogenology, 2000, 54, 5, pp 757-769

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