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- Article] The effect of interruptions during training on the time to the first trial and race start in Thoroughbred racehorses
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DocNo of ILP: 852
Doc. Type: Article
Title: The effect of interruptions during training on the time to the first trial and race start in Thoroughbred racehorses
Authors: Bolwell, CF; Rogers, CW; French, NP; Firth, EC
Full Name of Authors: Bolwell, C. F.; Rogers, C. W.; French, N. P.; Firth, E. C.
Keywords by Author: Racehorse; Training; Exercise; Interruptions; Survival analysis
Keywords Plus: MODULATE SKELETAL DEVELOPMENT; TRACK-BASED EXERCISE; RACING PERFORMANCE; RISK; INDUSTRY; STRATEGY; GROWTH
Abstract: Few studies have investigated the effect of having interruptions during training on future training and racing performance in Thoroughbred racehorses. The aim of this paper was to investigate the effect of having an interruption before the first trial on starting in a trial or a race. A prospective cohort study was used to record the training activity of a cohort of Thoroughbred racehorses, over two racing seasons. Fourteen racehorse trainers recorded information on the distances worked at canter and at fast speeds (<15 s/200 m) and provided reasons for horses not training, or for having interruptions (break from training). Trial and racing results were obtained from the New Zealand Thoroughbred Racing online database. A Cox proportional hazards regression model was used to investigate two outcome measures of performance: (1) time to the first trial and (2) time to the first race. The type of interruption that had occurred before the first trial was the main exposure of interest, and was grouped into: no interruption, voluntary (no known condition or disease present) and involuntary interruptions (due to the presence of a condition or disease). A total of 160/200 (80%) horses started in at least one trial and 100/205 (48%) horses started in at least one race during the study period. The median time to starting in a trial or a race differed significantly (p < 0.001) with the type of interruption. The hazard of starting in a trial was lower for horses experiencing voluntary and involuntary interruptions (p < 0.001) but there was no association with starting in a race, after adjusting for confounding variables. As age at the start of training increased the hazard of starting in a trial decreased. Horses accumulating longer distances at 15 s/200 m had a higher hazard of starting in a trial, whilst horses accumulating fewer events at high speed and fewer trials had a reduced hazard of starting in a race. There was significant clustering at the trainer level for both the outcomes investigated. Interruptions to training had an effect on the time to, and hazard of, a trial but not a race start. The timing of these interruptions may have implications for future racing success and career longevity. (c) 2012 Elsevier B.V. All rights reserved.
Cate of OECD: Veterinary science
Year of Publication: 2013
Business Area: horse race
Detail Business: racehorse
Country: Netherlands
Study Area:
Name of Journal: PREVENTIVE VETERINARY MEDICINE
Language: English
Country of Authors: [Bolwell, C. F.; Rogers, C. W.; French, N. P.; Firth, E. C.] Massey Univ, IVABS, Palmerston North 4442, New Zealand
Press Adress: Bolwell, CF (reprint author), Massey Univ, IVABS, Private Bag 11222, Palmerston North 4442, New Zealand.
Email Address: c.bolwell@massey.ac.nz
Citaion:
Funding: New Zealand Racing Board as part of the Equine Partnership for Excellence
Lists of Citation: [Anonymous], 2011, ANN N AM REGISTERED; [Anonymous], 2009, NZ THOROUGHBRED RACI; [Anonymous], 2011, SIZE FIELD STARTS PE; Bailey CJ, 1999, AM J VET RES, V60, P1196; Barneveld A., 1999, EQUINE VET J S, V31, P112; Bolwell C.F., 2011, THESIS MASSEY U PALM; Bolwell CF, 2012, NEW ZEAL VET J, V60, P241, DOI 10.1080/00480169.2012.673163; Bolwell C. F., 2010, Comparative Exercise Physiology, V7, P37; Carrier TK, 1998, J AM VET MED ASSOC, V212, P1582; Cheetham J, 2010, EQUINE VET J, V42, P346, DOI 10.1111/j.2042-3306.2010.00032.x; Cleves M., 2010, COX MODEL DIAGNOSTIC, P223; Cogger N, 2008, AUST VET J, V86, P419, DOI 10.1111/j.1751-0813.2008.00358.x; Collett D., 2003, MODELLING SURVIVAL D, P122; Dohoo I., 2003, VET EPIDEMIOLOGIC RE, P439; Ely ER, 2010, EQUINE VET J, V42, P624, DOI 10.1111/j.2042-3306.2010.00257.x; Estberg L, 1998, PREV VET MED, V33, P159, DOI 10.1016/S0167-5877(97)00047-0; McCarthy G., 2008, NZ THOROUGHBRED RACI; More SJ, 1999, AUST VET J, V77, P105, DOI 10.1111/j.1751-0813.1999.tb11678.x; Murray RC, 2010, VET J, V184, P27, DOI 10.1016/j.tvjl.2009.03.020; Perkins NR, 2005, NEW ZEAL VET J, V53, P59, DOI 10.1080/00480169.2005.36470; Perkins NR, 2005, NEW ZEAL VET J, V53, P69, DOI 10.1080/00480169.2005.36471; Rogers CW, 2008, EQUINE VET J, V40, P111, DOI 10.2746/042516408X268923; Rogers CW, 2008, EQUINE VET J, V40, P119, DOI 10.2746/042516408X266088; Royston P, 2005, METHOD INFORM MED, V44, P561; Rubin D.B., 1987, STAT ANAL MISSING DA, P40; StataCorp, 2009, MULT REF MAN REL 11; StataCorp, 2009, SURV AN EP TABL REF; Tanner J.C., 2012, EQUINE VET J, DOI 10.111/j.2042-3306.2011.00534.x; Tanner J.C., 2011, NZ VET J, V59, P331; Verheyen KLP, 2009, VET J, V181, P43, DOI 10.1016/j.tvjl.2009.03.008
Number of Citaion: 30
Publication: ELSEVIER SCIENCE BV
City of Publication: AMSTERDAM
Address of Publication: PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
ISSN: 0167-5877
29-Character Source Abbreviation: PREV VET MED
ISO Source Abbreviation: Prev. Vet. Med.
Volume: 108
Version: 41673
Start of File: 188
End of File: 198
DOI: 10.1016/j.prevetmed.2012.08.010
Number of Pages: 11
Web of Science Category: Veterinary Sciences
Subject Category: Veterinary Sciences
Document Delivery Number: 078BW
Unique Article Identifier: WOS:000314074100011
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