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Background  Blood  l ‐lactate and glucose concentrations were higher in ponies with gastrointestinal disease than in horses, possibly because of differences in body condition (BC).    Objectives  To investigate whether  l ‐lactate and glucose concentrations correlate with BC and differ between healthy horses and ponies.    Animals  Systemically healthy client‐owned ponies (n = 101) and horses (n = 51).    Methods  Prospective observational study. Breed, weight, height, and subjective and objective measures of BC were recorded and  l ‐lactate and glucose concentrations were measured. Correlations between  l ‐lactate and glucose concentrations and BC were established. The association between  l ‐lactate concentrations, equid type (pony or horse), BC, age, and glucose concentrations was investigated using a multivariable model.    Results  Weak but significant ( P  = .001) negative correlations were detected between  l ‐lactate concentration and average BC score ( r  = −0.29), heart girth:height ratio ( r  = −0.27), and age ( r  = −0.27). Glucose concentrations were significantly ( P  < .001) positively correlated with neck length:heart girth ratio ( r  = 0.37) and heart girth:height ratio ( r  = 0.31).  l ‐lactate and glucose concentrations were weakly correlated ( r  = 0.15;  P  = .04). In the final multivariable model, age (−0.02 ± 0.006;  P  = .001) and heart girth:height ratio (−1.74 ± 0.53;  P  = .001) were significantly associated with the natural logarithm of  l ‐lactate concentration (Ln l ‐Lactate). This represents a 2% decrease in  l ‐lactate concentration per year increase in age and 10% decrease in  l ‐lactate concentration per 0.06 unit increase in heart girth:height ratio.    Conclusions and Clinical Importance  In healthy horses and ponies, age and BC significantly influence  l ‐lactate concentrations.

Correlation between l ‐lactate and glucose concentrations and body condition score in healthy horses and ponies