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Effect of weaning on distal radius physeal closure, serum cortisol and growth rate in thoroughbred foals
Mondino ., Mariela Ayalen; Bilbao...
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Introduction
Radiological evaluation of growth epiphyseal growth cartilages is important before starting training in young horses. It is an indicator of bone maturity and supports ridden exercise while avoiding often irreversible lesions. The objective of this study is to determine variation of growth markers and stress indicators generated by weaning between males and females. We hypothesized that stress induced by weaning impacts on long bone growth cartilage closure differently between genders.
Materials and methods
This observational study was carried out on thirty Thoroughbred male and female foals raised in northwestern La Pampa province, Argentina. Individual weights were recorded monthly from birth to weaning (at 6-8 months of age), and height at the withers was recorded at birth and weaning. Two blood samples were obtained from each subject, 7 days before and 2 days after weaning, to determine serum cortisol. Distal radius dorsocaudal radiographs were obtained from each subject at 18 months of age to determine growth plate closure.
results
Weight gain increased proportionally to time, as expected. There was no difference between genders from birth to weaning, neither in weight gain (P=0.405) nor in height (P=0.369). Serum cortisol values were higher in females than in males at both sampling times (P=0.004). Within each gender, there was no difference in serum cortisol between sampling times (P=0.778). There was no gender-time interaction (P=0.962). There was no relationship between growth plate closure and age (P=0.134). Growth plate closure tended to be more frequent in females than in males at the time of sampling (P=0.067).
Discussion/Conclusions
Thoroughbred female yearlings seem to have earlier distal radius growth plate closure times than males, according to our observations. This suggests that females have a higher growth rate than males and might support an earlier start of training providing growth plate closure is monitored.
References
- Arfuso, F., Assenza, A., Tosto, F., Giannetto, C., Interlandi, C., Piccione, G., & Liotta, L. (2022). Serum bone metabolism biomarkers in healthy fillies and colts from weaning until one year of age. Research in Veterinary Science, 150, 156–163. https://doi.org/10.1016/j.rvsc.2022.06.018
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About
Affiliation of the authors at the time of publication
1Universidad Nacional De La Pampa, Facultad de ciencias veterinaria, General Pico, Argentina ; 2Universi- dad Nacional De La Pampa-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Facul- tad de ciencias veterinaria, General Pico, Argentina ; 3private, activity, Buenos Aires, Argentina ; 4Universi- dad Austral de Chile, Instituto de Ciencias Clínicas Veterinarias, Facultad de Ciencias Veterina, Doha, Qatar
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