Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2017;28(1):13-17.
doi: 10.1294/jes.28.13. Epub 2017 Mar 28.

Application of a Wearable GPS Unit for Examining Interindividual Distances in a Herd of Thoroughbred Dams and Their Foals

Affiliations
Free PMC article

Application of a Wearable GPS Unit for Examining Interindividual Distances in a Herd of Thoroughbred Dams and Their Foals

Fumio Sato et al. J Equine Sci. .
Free PMC article

Abstract

Global positioning system (GPS) units are now lightweight and compact. They have proven useful for analyzing the behavioral characteristics of horses in pastures. Because the GPS records data in latitude and longitude, it may be feasible to calculate the distance between GPS units. The present study aimed to confirm the applicability of GPS units in behavioral studies on horses. For this, we analyzed the accuracy of the distances calculated from GPS units using Hubeny's distance formula and of the monthly changes in interindividual distances obtained from GPS units worn by Thoroughbred dams and their foals in a pasture until weaning. The calculated inter-GPS distances were highly accurate. The regression line was linear, and the squared correlation coefficient (r2) was 0.9998. During the first month of age, the interindividual dam-dam and foal-foal distances were significantly greater than the dam-foal distance. During the second month of age, the dam-foal distance increased once and gradually decreased up to the fifth month of age. During the sixth month of age, the dam-foal distance was significantly greater than the foal-foal distance. The GPS distances calculated using Hubeny's distance formula were useful for analyzing changes in interindividual distances in a herd of Thoroughbred dams and their foals. Most likely, calculation of the distance between GPS units worn on equine head collars is likely to become a very useful tool as an objective index for quantifying equine behavioral observations.

Keywords: GPS; Thoroughbred; dam; foal; interindividual distance.

Figures

Fig. 1.
Fig. 1.
Photograph of global positioning system (GPS) units on the ventral sides of the head collars (white circles) of a dam and a 2-month-old foal.
Fig. 2.
Fig. 2.
Age-related changes in the interindividual dam–foal, dam–dam, and foal–foal distances obtained from GPS units. Mean distances ± SD are plotted. Bars indicate significant differences between two groups at the same sampling point (P<0.05). The same letters (a, b, c, and d) indicate significant differences from the first month of age (P<0.05).

Similar articles

See all similar articles

References

    1. Cameron E.Z., Linklater W.L., Stafford K.J., Minot E.O. 2003. Social grouping and maternal behavior in feral horses (Equus caballus): the influence of males on maternal protectiveness. Behav. Ecol. Sociobiol. 53: 92–101.
    1. DuBois C., Zakrajsek E., Haley D.B., Merkies K. 2015. Validation of triaxial accelerometers to measure the lying behaviour of adult domestic horses. Animal 9: 110–114. - PubMed
    1. Heitor F., Vicente L. 2008. Maternal care and foal social relationships in a herd of Sorraia horses: influence of maternal rank and experience. Appl. Anim. Behav. Sci. 113: 189–205.
    1. Jennings D., Cormack S., Coutts A.J., Boyd L.J., Aughey R.J. 2010. Variability of GPS units for measuring distance in team sport movements. Int. J. Sports Physiol. Perform. 5: 565–569. - PubMed
    1. Kurvers C.M., van Weeren P.R., Rogers C.W., van Dierendonck M.C. 2006. Quantification of spontaneous locomotion activity in foals kept in pastures under various management conditions. Am. J. Vet. Res. 67: 1212–1217. - PubMed

LinkOut - more resources

Feedback