effect of premolar and molar occlusal angle on feed digestibility water balance and fecal particle size in horses objective to determine whether occlusal angle of the premolar and molar teeth ie molar occlusal angle was associated with feed digestibility water balance or fecal particle size in adult horsesdesign observational studyanimals 40 pregnant mares ranging from 3 to 19 years oldprocedure the horses were randomly allocated to 1 of 5 feeding groups with 8 horsesgroup horses were sedated and molar occlusal angle was measured with 2 methods an oral examination was performed and total number of dental abnormalities was recorded feed digestibility water balance and fecal particle size were measured 7 and 16 weeks laterresults molar occlusal angle ranged from 63 degrees to 193 degrees and was not significantly associated with feed digestibility water balance or fecal particle size the number of dental abnormalities was not associated with feed digestibility molar occlusal angle did not vary significantly with horse ageconclusions and clinical relevance results indicate that molar occlusal angles between 6 degrees and 19 degrees do not adversely affect feed digestibility water balance or fecal particle size in adult horses additionally there was no association between age and molar occlusal angle