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Animal Science Database

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Abstract

Today's activity monitoring systems do much more than just identify cow/heifer for insemination. The addition of rumination monitoring allows the identification of health events along with reproductive events. Performance of automated activity monitoring (AAM) systems in combination with timed ...

Author(s)
Nebel, R. L.
Publisher
The Society for Theriogenology, Montgomery, USA
Citation
Clinical Theriogenology, 2018, 10, 3, pp 247-251
Abstract

Using 1 market-available activity monitor, 3 experiments were conducted in dairy cows to determine timing of ovulation, compare within-herd conception risk of cows inseminated based on activity monitors versus timed artificial insemination (AI), and determine conception risk of cows inseminated at...

Author(s)
Stevenson, J. S.; Hill, S. L.; Nebel, R. L.; DeJarnette, J. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2014, 97, 7, pp 4296-4308
Abstract

For the last 65 years, the industry standard for time of artificial insemination (AI) relative to onset of estrus has been established as 12 h after observed estrus. More recent experiments indicated the optimum time for AI was 4-12 h after onset of estrus in dairy cattle, but little recent...

Author(s)
Dorsey, B. R.; Kasimanickam, R.; Whittier, W. D.; Nebel, R. L.; Wahlberg, M. L.; Hall, J. B.
Publisher
Elsevier Ltd, Oxford, UK
Citation
Animal Reproduction Science, 2011, 127, 1/2, pp 1-6
Abstract

Reproductive performance of a dairy herd is a function of certain management policies and how well these are implemented in daily herd management. It has long been known that there is an important economic advantage to be gained by efficient reproduction in dairy herds. The ability to use records...

Author(s)
Nebel, R. L.; DeJarnette, J. M.
Publisher
American Association of Bovine Practitioners, Stillwater, USA
Citation
Proceedings of the Fortieth Annual Conference, American Association of Bovine Practitioners, Vancouver, British Columbia, Canada, 20-22 September, 2007, 2007, pp 50-56
Abstract

Resynchronization in dairy cows provides tighter synchrony of follicular dynamics and estrus, and facilitates submission for subsequent artificial insemination (AI) in a timely manner. Intravaginal progesterone devices (IPD) are considered safe for the use in lactating dairy cows and have been...

Author(s)
Kasimanickam, R.; Cornwell, J. M.; Nebel, R. L.
Publisher
The Society for Theriogenology, Montgomery, USA
Citation
Clinical Theriogenology, 2011, 3, 4, pp 473-475
Abstract

The objective of the study was to determine the effect of gonadotropin releasing hormone (GnRH) administration on day 5 or day 7 after artificial insemination (AI) on progesterone concentration, total corpus luteum (CL) volume and pregnancy/AI (P/AI) in lactating dairy cows. Multiparous dairy cows...

Author(s)
Kasimanickam, R. K.; Mink, M. R.; Nebel, R. L.
Publisher
The Society for Theriogenology, Montgomery, USA
Citation
Clinical Theriogenology, 2011, 3, 4, pp 455-459
Abstract

A review. For the majority of dairy herds where artificial insemination (AI) is practiced, the limiting factor toward obtaining efficient reproductive performance is the failure to detect oestrus in a timely and accurate manner. Periodic visual observation has been the dominant method used to...

Author(s)
Nebel, R. L.; Dransfield, M. G.; Jobst, S. M.; Bame, J. H.
Citation
Animal Reproduction Science, 2000, 60/61, pp 713-723
Abstract

The objective of this study was to compare the conception rate for fixed-timed artificial insemination (FTAI) and observed heat artificial insemination (HAI) prior to the scheduled FTAI in Ovsynch and Heatsynch synchronization protocols. In Experiment 1, lactating dairy cows (n=535) received two...

Author(s)
Kasimanickam, R.; Cornwell, J. M.; Nebel, R. L.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2005, 63, 9, pp 2550-2559
Abstract

Ejaculates were collected by artificial vagina from 3 Holstein sires and sorted to 90% purity for X-chromosome-bearing spermatozoa (range 88 to 93%) using flow cytometry. Sorted sperm were diluted to 2.1, 3.5, or 5.0×106 sperm per dose in an egg yolk (20%), Tris, glycerol (7%) extender. Collections ...

Author(s)
DeJarnette, J. M.; Nebel, R. L.; Marshall, C. E.; Moreno, J. F.; McCleary, C. R.; Lenz, R. W.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2008, 91, 5, pp 1778-1785
Abstract

The objective of the study was to compare three systems for estrus detection and combinations of these systems on a large commercial dairy (1075 lactating cows) during stress of summer heat. At 37-45 days in milk (DIM), 255 cows were fitted with a HeatWatch® device (HW; DDx Inc., Denver, CO), an...

Author(s)
Peralta, O. A.; Pearson, R. E.; Nebel, R. L.
Publisher
Elsevier, Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2005, 87, 1/2, pp 59-72

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