2018 ACVIM Forum Research Abstract Program: Seattle, Washington, June 14 - 15, 2018

[HU] of a region of interest) of the dorsal, palmar, medial, and lateral cortices at the midpoint of the diaphysis. Data were analyzed by ANOVA and ANOVA on ranks. Significant (p < 0.05) differences were found in palmar cortex thickness between PPID + and YOUNG (YOUNG greater) and in lateral cortex thickness between PPIDand both PPID + and YOUNG (PPIDgreater than both PPID + and YOUNG). For bone density the only significant (p < 0.05) difference detected was in palmar HU between PPID + and YOUNG (YOUNG greater). Although minor differences were found in cortical bone thickness and HU between groups, there was not a consistent effect of PPID + , as compared to PPIDand YOUNG. Further, it was difficult to separate effects of age and PPID status. In conclusion, substantial changes in third metacarpal cortical thickness or density were not found in this cohort of PPID + horses. (3). Sixty-one percent were female, while 31% were geldings, and 7% stallions. Fifty-eight percent survived to discharge, while 41% died or were euthanized. Degree of hyperlipemia was not associated with survival. The most common primary diagnosis was enterocolitis (36%); 17% were diagnosed with a form of colic (medical or surgical), while other diagnoses included primary hyperlipemia, botulism, pneumonia, dystocia, guttural pouch empyema, and lymphoma.