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Onoda T, Yamamoto R, Sawamura K, et al. Empirical Growth Curve Estimation Using Sigmoid Sub-functions that Adjust Seasonal Compensatory Growth for Male Body Weight of Thoroughbred Horses. J Equine Sci. 2011;22(2):37-42doi: 10.1294/jes.22.37.
Onoda, T., Yamamoto, R., Sawamura, K., Inoue, Y., Matsui, A., Miyake, T., & Hirai, N. (2011). Empirical Growth Curve Estimation Using Sigmoid Sub-functions that Adjust Seasonal Compensatory Growth for Male Body Weight of Thoroughbred Horses. Journal of equine science, 22(2), 37-42. https://doi.org/10.1294/jes.22.37
Onoda, Tomoaki, et al. "Empirical Growth Curve Estimation Using Sigmoid Sub-functions that Adjust Seasonal Compensatory Growth for Male Body Weight of Thoroughbred Horses." Journal of equine science vol. 22,2 (2011): 37-42. doi: https://doi.org/10.1294/jes.22.37
Onoda T, Yamamoto R, Sawamura K, Inoue Y, Matsui A, Miyake T, Hirai N. Empirical Growth Curve Estimation Using Sigmoid Sub-functions that Adjust Seasonal Compensatory Growth for Male Body Weight of Thoroughbred Horses. J Equine Sci. 2011;22(2):37-42. doi: 10.1294/jes.22.37. Epub 2011 Jul 20. PMID: 24833986; PMCID: PMC4013972.
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J Equine Sci. 2011;22(2):37-42. doi: 10.1294/jes.22.37. Epub 2011 Jul 20.

Empirical Growth Curve Estimation Using Sigmoid Sub-functions that Adjust Seasonal Compensatory Growth for Male Body Weight of Thoroughbred Horses.

Journal of equine science

Tomoaki Onoda, Ryuta Yamamoto, Kyohei Sawamura, Yoshinobu Inoue, Akira Matsui, Takeshi Miyake, Nobuhiro Hirai

Affiliations

  1. Comparative Agricultural Sciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan.
  2. The Japan Bloodhorse Breeders' Association, 4-5-4 Shinbashi, Minato-ku, Tokyo 105-0004, Japan.
  3. JRA Facilities Co. Ltd., 4-5-4 Shinbashi, Minato-ku, Tokyo 105-0004, Japan.
  4. Hidaka Training and Research Center, Japan Racing Association, 535-13 Nissha, Urakawa-cho, Hidaka, Hokkaido 057-0171, Japan.
  5. Equine Research Institute, Japan Racing Association, 321-4 Tokami-cho, Utsunomiya, Tochigi 320-0856, Japan.

PMID: 24833986 PMCID: PMC4013972 DOI: 10.1294/jes.22.37

Abstract

Thoroughbred horses are seasonal mating animals, raised in northern regions or countries. Foals born yearly in spring generally show a typical seasonal compensatory growth pattern, in which their growth rate declines in the first winter and increases in the next spring. In this study, a new empirical adjustment approach is proposed to adjust for this compensatory growth when growth curve equations are estimated, by using 1,633 male body weights of Thoroughbreds as an illustrating example. Based on general Richards growth curve equation, a new growth curve equation was developed and fit to the weight-age data. The new growth curve equation had a sigmoid sub-function that can adjust the compensatory growth, combined with the Richards biological parameter responsible for the maturity of animals. The unknown parameters included in the equations were estimated by SAS NLMIXED procedure. The goodness of fit was examined by using Akaike's Information Criterion (AIC). The AIC values decreased from 13,053 (general Richards equation) to 12,794 (the newly developed equation), indicating the better fit of the new equation to the weight-age data. The shape of the growth curve was improved during the period of compensatory growth. The proposed method is one of the useful approaches for adjusting seasonal compensatory growth in growth curve estimations for Thoroughbreds, and for their management during the compensatory period. Based on this approach, the optimal growth curve equations can be estimated also for female body weight of Thoroughbreds or other growth traits affected by seasonal compensatory growth.

Keywords: Thoroughbred colt; body weight; compensatory growth; growth curve; sigmoid function

References

  1. Ann Bot. 2003 Feb;91(3):361-71 - PubMed
  2. N Z Vet J. 2007 Dec;55(6):319-25 - PubMed
  3. N Z Vet J. 2005 Oct;53(5):326-31 - PubMed
  4. Growth Dev Aging. 1996 Summer;60(2):71-83 - PubMed
  5. J Anim Sci. 2004 Apr;82(4):1007-15 - PubMed
  6. J Anim Sci. 1979 Mar;48(3):480-7 - PubMed
  7. Growth Dev Aging. 1998 Spring-Summer;62(1-2):27-36 - PubMed
  8. J Anim Sci. 2007 Jan;85(1):84-92 - PubMed

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