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Animal Science Database

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Abstract

The objectives of this cross-sectional study were to characterize reproductive management practices on Canadian dairy farms and describe differences based on regional and demographic factors. A questionnaire was offered to all licensed Canadian dairy producers and included 189 questions regarding...

Author(s)
Schyndel, S. J. van; Bauman, C. A.; Pascottini, O. B.; Renaud, D. L.; Dubuc, J.; Kelton, D. F.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 2, pp 1822-1831
Abstract

The objectives of this study were to describe the characteristics and motivations of producers who had implemented automated activity-monitoring (AAM) systems and to compare herd reproductive performance before and after the implementation of an AAM system and between herds with AAM and herds...

Author(s)
Neves, R. C.; LeBlanc, S. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2015, 98, 4, pp 2801-2811
Abstract

North American reindeer (Rangifer tarandus tarandus) are seasonally polyestrus short-day breeders. Seasonal ovarian activity begins in late August with an estrous cycle length of 24±3.4 days. Estrous synchronization protocols have been published and are similar to protocols in sheep and goats. ...

Author(s)
Bott, N. I.
Publisher
American Association of Bovine Practitioners, Stillwater, USA
Citation
Proceedings of the Fifty-First Annual Conference of the American Association of Bovine Practitioners, Phoenix, Arizona, USA, September 13-15, 2018, 2018, pp 188-191
Abstract

Pregnancy per AI (P/AI) following the use of 1 of 2 timed AI (TAI) protocols and 2 different intervals between TAI and resynchronization were compared in heifers that were inseminated with either conventional or sex-sorted semen. Holstein heifers (n=317; 527 inseminations) were submitted to a 5-d...

Author(s)
Macmillan, K.; Loree, K.; Mapletoft, R. J.; Colazo, M. G.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2017, 100, 5, pp 4134-4138
Abstract

The objective was to evaluate in-line milk progesterone (mP4) data to determine dynamics of pre- and post-insemination mP4 profiles and their associations with parity and outcomes of artificial insemination (AI) in Holstein cows. Milk progesterone (ng/mL) was quantified at pre-determined time...

Author(s)
Bruinjé, T. C.; Gobikrushanth, M.; Colazo, M. G.; Ambrose, D. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2017, 102, pp 147-153
Abstract

This is a review of the physiology and endocrinology of the estrous cycle and how ovarian physiology can be manipulated and controlled for timed artificial insemination (TAI) in beef and dairy cattle. Estrus detection is required for artificial insemination (AI), but it is done poorly in dairy...

Author(s)
Colazo, M. G.; Mapletoft, R. J.
Publisher
Canadian Veterinary Medical Association, Ottawa, Canada
Citation
Canadian Veterinary Journal, 2014, 55, 8, pp 772-780
Abstract

Bioperformance of two summer pasture and four winter feeding cow-calf production strategies in the western Canadian Parkland was evaluated. Diet composition and animal data were collected over 5 production years. Each production year began with fixed-time artificial insemination (TAI) of cows and...

Author(s)
Legesse, G.; Small, J. A.; Scott, S. L.; Kebreab, E.; Crow, G. H.; Block, H. C.; Robins, C. D.; Khakbazan, M.; McCaughey, W. P.
Publisher
Agricultural Institute of Canada, Ottawa, Canada
Citation
Canadian Journal of Animal Science, 2012, 92, 1, pp 89-102
Abstract

Many advances in genetic selection, nutrition, housing and disease control have been incorporated into modern pork production since the 1950s resulting in highly prolific females and practices and technologies, which significantly increased efficiency of reproduction in the breeding herd. The...

Author(s)
Kraeling, R. R.; Webel, S. K.
Publisher
BioMed Central Ltd, London, UK
Citation
Journal of Animal Science and Biotechnology, 2015, 6, 3, pp (31 January 2015)
Abstract

A survey was performed to assess whether reproductive management differed among small-sized (Sm, <500 sows), medium-sized (M, 501 to 2,000 sows), and large-sized (Lg, 2,001 to 8,000 sows) farms (n=113). Farms with 501 to 4000 sows/barn were most frequent with sows kept in stalls on 90% of farms. ...

Author(s)
Knox, R. V.; Zas, S. L. R.; Sloter, N. L.; McNamara, K. A.; Gall, T. J.; Levis, D. G.; Safranski, T. J.; Singleton, W. L.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2013, 91, 1, pp 433-445
Abstract

Three genetic groups of Holstein-Friesian dairy cows were established from within the Moorepark (Teagasc, Ireland) dairy research herd: LowNA, indicative of the Irish national average-genetic-merit North American Holstein-Friesian; HighNA, high-genetic-merit North American Holstein-Friesian;...

Author(s)
Coleman, J.; Pierce, K. M.; Berry, D. P.; Brennan, A.; Horan, B.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2009, 92, 10, pp 5258-5269

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