Endocrine Dysfunction in the Aged Horse
Authors: Messer Nat T.
Journal: Equine Geriatric Medicine and Surgery
Summary
# Editorial Summary: Endocrine Dysfunction in the Aged Horse Weight loss and poor body condition in geriatric horses frequently stems from three principal causes—dental deterioration, pituitary pars intermedia dysfunction (PPID), and reduced voluntary intake due to social competition or pain from osteoarthritis—each requiring distinct management approaches to reverse. Beyond diagnosing underlying pathology, simple husbandry interventions such as separated feeding and pain management can substantially improve both feed consumption and condition scoring. Nutritionally, healthy older horses typically thrive on diets containing 12–16% crude protein incorporating highly digestible ingredients, whilst those with severe dental wear benefit from textural modification of forage through soaking hay cubes, chopped hay, or sugar beet pulp rather than long-stem hay. Where concurrent endocrine, hepatic, or renal disease is present, dietary formulation must be tailored accordingly—a consideration that underscores the importance of thorough clinical assessment before implementing any nutritional programme. For practitioners managing older equines, this framework emphasises that apparent geriatric decline in condition often responds well to systematic evaluation of feeding systems, dental status, and metabolic health rather than attributing poor body condition solely to age.
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Practical Takeaways
- •When an older horse loses condition, systematically assess dental health, check for signs of pituitary dysfunction, and evaluate feeding management and social dynamics at the feed trough before assuming disease
- •Ensure adequate protein (12-16% crude protein) and highly digestible feeds for thin aged horses; simple management adjustments often improve condition without medication
- •For horses with severe dental wear, switch from long-stem hay to soaked hay cubes, chopped hay, or soaked sugar beet pulp to maintain fibre intake and digestive health
Key Findings
- •Common causes of weight loss in older horses include dental abnormalities, pituitary pars intermedia dysfunction, and reduced feed intake from competition or pain
- •Feed intake and body condition may improve with management changes in aged horses
- •Thin but healthy old horses benefit from diets providing 12-16% crude protein with highly digestible feedstuffs
- •Horses with severe dental problems require alternative forage such as soaked hay cubes, chopped hay, or soaked sugar beet pulp