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Abstract

Timed artificial insemination protocols in beef cattle are designed to synchronize ovulation in a greater proportion of females while simultaneously achieving acceptable pregnancy rates and a concise calving season. Protocols achieving such goals reduce time and labor associated with estrus...

Author(s)
White, S. S.; Kasimanickam, R. K.; Kasimanickam, V. R.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 86, 3, pp 785-790
Abstract

Expanded use of artificial insemination (AI) and/or adoption of emerging reproductive technologies for beef heifers and cows require precise methods of estrous-cycle control. New protocols for inducing and synchronizing a fertile estrus in replacement beef heifers and postpartum beef cows in which...

Author(s)
Patterson, D. J.; Thomas, J. M.; Martin, N. T.; Nash, J. M.; Smith, M. F.
Publisher
Elsevier Inc, New York, USA
Citation
Veterinary Clinics of North America, Food Animal Practice, 2013, 29, 3, pp 591-617
Abstract

Compared to Bos taurus cattle, Bos indicus influenced cattle have a history of decreased pregnancy rates following artificial insemination (AI). These decreased pregnancy rates among Bos indicus influenced cattle may be attributed to their higher excitability response to stressful situations, which ...

Author(s)
Ferguson, C. E.; Kesler, D. J.; Storer, W.; Poole, M.; Pousson, B.; Richard, H.
Publisher
Colégio Brasileiro de Reprodução Animal, Belo Horizonte, Brazil
Citation
Animal Reproduction (Belo Horizonte), 2012, 9, 2, pp 120-124
Abstract

Physiological diversities of beef heifers at the time of breeding offer both challenges and opportunities to implement cost effective synchronization protocols. The objective was to determine the interaction effect of ovulation synchronization with or without progesterone (P4) supplementation and...

Author(s)
Oldham, J.; Kasimanickam, V.; Kasimanickam, R.
Publisher
The Society for Theriogenology, Montgomery, USA
Citation
Clinical Theriogenology, 2017, 9, 3, pp 407
Abstract

Maximizing reproductive efficiency depends upon whether a heifer attains puberty before the start of the breeding season, conceives early in the breeding season, calves unassisted, raises the calf to the time it is marketed, and the heifer/cow must conceive to calve early during the subsequent...

Author(s)
Lamb, G. C.; Smith, M. F.; Perry, G. A.; Atkins, J. A.; Risley, M. E.; Busch, D. C.; Patterson, D. J.
Publisher
American Association of Bovine Practitioners, Stillwater, USA
Citation
Bovine Practitioner, 2010, 44, 1, pp 18-26
Abstract

Dairy heifers were used to compared the effects of two timed AI+controlled internal drug release (CIDR) protocols (5-day vs. a modified 7-day) on: (1) luteal regression to initiate a new ovarian follicular wave; (2) ovarian response to the initial GnRH injection; and (3) pregnancy outcomes....

Author(s)
Mellieon, H. I., Jr.; Pulley, S. L.; Lamb, G. C.; Larson, J. E.; Stevenson, J. S.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2012, 78, 9, pp 1997-2006
Abstract

The objectives of the current experiment were to evaluate the reproductive performance and economic outcome of 3 synchronization strategies for first artificial insemination (AI) of dairy heifers. Holstein heifers from 2 herds (site A, California, n=415; site B, Idaho, n=425) were assigned to 1 of...

Author(s)
Lopes, G., Jr.; Johnson, C. R.; Mendonça, L. G. D.; Silva, P. R. B.; Moraes, J. G. N.; Ahmadzadeh, A.; Dalton, J. C.; Chebel, R. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2013, 96, 3, pp 1612-1622
Abstract

We conducted 3 experiments to test various protocols for synchronizing oestrus, ovulation, or both before insemination of heifers. In experiment 1, 23 controls received two PGF injections; 23 heifers were treated like the controls plus a norgestomet implant for 8 days, with the second PGF...

Author(s)
Stevenson, J. S.; Smith, J. F.; Hawkins, D. E.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2000, 83, 9, pp 2008-2015
Abstract

Four experiments were carried out in 1959, using 3 herds of Hereford and 1 of Aberdeen-Angus heifers in the New England region. After ovarian examination and, where possible, the enucleation of corpora lutea, the heifers were injected for 6 days with progesterone in oil. This was followed in some...

Author(s)
LAMOND, D. R.
Citation
Australian Journal of Agricultural Research, 1964, 15, pp 461-470
Abstract

AKINS, E. L., LTJDWICK, T. M., RICKARD, H. E., RADER, E. R., and ETGEN, W. M. Association of certain type evaluations and type scores of first-lactation Holstein females: 748. ALMQTJIST, J. O., AMANN, R. P., and O'DELL, W. T. Sperm reserves of dairy bulls as determined by depletion trials and...

Citation
Journal of Dairy Science, 1958, 41, pp 701-751

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