References

Brosnahan MM, Paradis MR. Demographic and clinical characteristics of geriatric horses: 467 cases (1989–1999). J Am Vet Med Assoc. 2003; 223:(1)93-98 https://doi.org/10.2460/javma.2003.223.93

Copas VE, Durham AE. Circannual variation in plasma adrenocorticotropic hormone concentrations in the UK in normal horses and ponies, and those with pituitary pars intermedia dysfunction. Equine Vet J. 2012; 44:(4)440-443 https://doi.org/10.1111/j.2042-3306.2011.00444.x

Durham AE, McGowan CM, Fey K, Tamzali Y, van der Kolk JH. Pituitary pars intermedia dysfunction: diagnosis and treatment. Equine Veterinary Education. 2014; 26:(4)216-223 https://doi.org/10.1111/eve.12160

Else RW, Holmes JR. Cardiac pathology in the horse. 1. Gross pathology. Equine Vet J. 1972; 4:(1)1-8 https://doi.org/10.1111/j.2042-3306.1972.tb03868.x

Recommendations for the diagnosis and management of equine metabolic syndrome (EMS). 2022. http://sites.tufts.edu/equineendogroup (accessed 21 September 2023)

Gazzerro DM, Southwood LL, Lindborg S. Short-term complications after colic surgery in geriatric versus mature non-geriatric horses. Vet Surg. 2015; 44:(2)256-264 https://doi.org/10.1111/j.1532-950X.2014.12281.x

Recommendations for the diagnosis and treatment of pituitary pars intermedia dysfunction (PPID). 2021. https://sites.tufts.edu/equineendogroup/files/2021/12/2021-PPID-Recommendations-V11-wo-insert.pdf (accessed 21 September 2023)

Ireland JL, McGowan CM. Epidemiology of pituitary pars intermedia dysfunction: a systematic literature review of clinical presentation, disease prevalence and risk factors. Vet J. 2018; 235:22-33 https://doi.org/10.1016/j.tvjl.2018.03.002

Ireland JL, McGowan CM, Cleg PD, Chandler KJ, Pinchbeck GL. A survey of health care and disease in geriatric horses aged 30 years or older. The Veterinary J. 2011; 192:(1)57-64 https://doi.org/10.1016/j.tvjl.2011.03.021

Ireland JL, Clegg PD, McGowan CM, McKane SA, Chandler KJ, Pinchbeck GL. Disease prevalence in geriatric horses in the United Kingdom: veterinary clinical assessment of 200 cases. Equine Vet J. 2012a; 44:(1)101-106 https://doi.org/10.1111/j.2042-3306.2010.00361.x

Ireland JL, Clegg PD, McGowan CM, McKane SA, Chandler KJ, Pinchbeck GL. Comparison of owner-reported health problems with veterinary assessment of geriatric horses in the United Kingdom. Equine Vet J. 2012b; 44:(1)94-100 https://doi.org/10.1111/j.2042-3306.2011.00394.x

Junge RE, Sundberg JP, Lancaster WD. Papillomas and squamous cell carcinomas of horses. J Am Vet Med Assoc. 1984; 185:(6)656-659

Kerr KM, Alden CL. Equine neoplasia, a ten year survey. Proc Ann Meet Am Assoc Vet Lab Diag. 1974; 17:183-189

Malalana F, McGowan TW, Ireland JL, Pinchbeck GL, McGowan CM. Prevalence of owner-reported ocular problems and veterinary ocular findings in a population of horses aged ≥15 years. Equine Vet J. 2019; 51:(2)212-217 https://doi.org/10.1111/evj.13005

Marr CM. Cardiac murmurs; valvular regurgitation and insufficiency: Aortic valvular regurgitation and insufficiency, 2nd ed. In: Marr CM, Bowen IM (eds). St Louis: Elsevier; 2010

McFarlane D. Equine pituitary pars intermedia dysfunction. Vet Clin North Am Equine Pract. 2011; 27:(1)93-113 https://doi.org/10.1016/j.cveq.2010.12.007

McFarlane D. Immune dysfunction in aged horses. Vet Clin North Am Equine Pract. 2016; 32:(2)333-341 https://doi.org/10.1016/j.cveq.2016.04.009

McFarlane D, Cribb AE. Systemic and pituitary pars intermedia antioxidant capacity associated with pars intermedia oxidative stress and dysfunction in horses. Am J Vet Res. 2005; 66:(12)2065-2072 https://doi.org/10.2460/ajvr.2005.66.2065

McFarlane D, Hale GM, Johnson EM, Maxwell LK. Fecal egg counts after anthelmintic administration to aged horses and horses with pituitary pars intermedia dysfunction. J Am Vet Med Assoc. 2010; 236:(3)330-334 https://doi.org/10.2460/javma.236.3.330

McFarlane D, Hill K, Anton J. Neutrophil function in healthy aged horses and horses with pituitary dysfunction. Vet Immunol Immunopathol. 2015; 165:(3–4)99-106 https://doi.org/10.1016/j.vetimm.2015.04.006

McGowan TW, Pinchbeck G, Phillips CJ, Perkins N, Hodgson DR, McGowan CM. A survey of aged horses in Queensland, Australia. Part 2: clinical signs and owners' perceptions of health and welfare. Aust Vet J. 2010; 88:(12)465-471 https://doi.org/10.1111/j.1751-0813.2010.00638.x

McGowan C. Welfare of aged horses. Animals (Basel). 2011; 1:(4)366-376 https://doi.org/10.3390/ani1040366

McIlwraith CW. Use of oral joint supplements in equine joint disease, 2nd ed. In: McIlwraith CW, Frisbie DD, Kawcak CE, van Weeren PR (eds). St Louis: Elsevier; 2016

McKeever KH. Exercise physiology of the older horse. Vet Clin North Am Equine Pract. 2002; 18:(3)469-490 https://doi.org/10.1016/s0749-0739(02)00029-9

McKeever KH, Eaton TL, Geiser S, Kearns CF, Lehnhard RA. Age related decreases in thermoregulation and cardiovascular function in horses. Equine Vet J Suppl. 2010; (38)220-227 https://doi.org/10.1111/j.2042-3306.2010.00259.x

Meier A, Reiche D, de Laat M, Pollitt C, Walsh D, Sillence M. The sodium-glucose co-transporter 2 inhibitor velagliflozin reduces hyperinsulinemia and prevents laminitis in insulin-dysregulated ponies. PLoS One. 2018; 13:(9) https://doi.org/10.1371/journal.pone.0203655

Much ML, Leatherwood JL, Martinez RE Evaluation of an oral joint supplement on gait kinematics and biomarkers of cartilage metabolism and inflammation in mature riding horses. Transl Anim Sci. 2020; 4:(3) https://doi.org/10.1093/tas/txaa150

Ralston SL, Squires EL, Nockels CF. Digestion in the aged horse. J Equine Vet Sci. 1989; 19:(4)203-205

Salazar P, Traub-Dargatz JL, Morley PS Outcome of equids with clinical signs of West Nile virus infection and factors associated with death. J Am Vet Med Assoc. 2004; 225:(2)267-274 https://doi.org/10.2460/javma.2004.225.267

Schuler LA, Khaitsa ML, Dyer NW, Stoltenow CL. Evaluation of an outbreak of West Nile virus infection in horses: 569 cases (2002). J Am Vet Med Assoc. 2004; 225:(7)1084-1089 https://doi.org/10.2460/javma.2004.225.1084

Siciliano PD. Nutrition and feeding of the geriatric horse. Vet Clin North Am Equine Pract. 2002; 18:(3)491-508 https://doi.org/10.1016/s0749-0739(02)00028-7

Stevens KB, Marr CM, Horn JN Effect of left-sided valvular regurgitation on mortality and causes of death among a population of middle-aged and older horses. Vet Rec. 2009; 164:(1)6-10 https://doi.org/10.1136/vr.164.1.6

Ueki H, Kowatari Y, Oyamada T, Oikawa M, Yoshikawa H. Non-functional C-cell adenoma in aged horses. J Comp Pathol. 2004; 131:(2–3)157-165 https://doi.org/10.1016/j.jcpa.2004.03.001

Valentine B. Neoplasia, 1st ed. In: Bertone J (ed). St Louis: WB Saunders; 2006

van der Kolk JH, Wensing T, Kalsbeek HC, Breukink HJ. Laboratory diagnosis of equine pituitary pars intermedia adenoma. Domest Anim Endocrinol. 1995; 12:(1)35-39 https://doi.org/10.1016/0739-7240(94)00006-m

van Weeren PR, Back W. Musculoskeletal disease in aged horses and its management. Vet Clin North Am Equine Pract. 2016; 32:(2)229-247 https://doi.org/10.1016/j.cveq.2016.04.003

Management of the older horse

02 November 2023
12 mins read
Volume 7 · Issue 6
Figure 1. A horse with pituitary pars intermedia dysfunction showing characteristic hypertrichosis, loss of muscling along the topline and pendulous abdomen.
Figure 1. A horse with pituitary pars intermedia dysfunction showing characteristic hypertrichosis, loss of muscling along the topline and pendulous abdomen.

Abstract

The increasing age of horses presented for veterinary care has been recognised over several decades. The increase in the percentage of horses older than 20 years of age has been attributed to improved nutrition, early recognition and management of conditions seen more frequently in the geriatric horse, and the increased willingness of owners to pursue veterinary care to maintain the comfort of their senior horses. Geriatric medicine is devoted to the management of conditions that have increasing age as a risk factor for their development. Conditions that are seen more frequently in older horses include pituitary pars intermedia dysfunction, chronic weight loss, obesity, osteoarthritis, laminitis, neoplasia and cardiovascular dysfunction. In addition, routine wellness care is essential for early recognition of age-related changes and prompt institution of appropriate care to maintain the comfort of the horse.

Care of the older horse is increasingly a major focus of equine practitioners, as a result of an increasing percentage of horses working and competing into their 20s (McKeever, 2002). Horses may be considered to become geriatric somewhere between 15 and 20 years of age (McGowan, 2011), although there is no universal definition because of the differences in the apparent rate of aging changes. These occur between various breeds of horses, with pony breeds commonly achieving greater than 30 years of age (van der Kolk et al, 1995), and among individual horses within a breed. Improvements in nutrition, improved health care and increased recognition by owners that geriatric horses can continue to be useful during their older years have all contributed to an increasing geriatric horse population (McKeever, 2002; Brosnahan and Paradis, 2003). With increasing age, there is an increasing risk of certain diseases. Early recognition of these diseases and proper management is important for maintaining the older horse's welfare and subsequent quality of life.

Register now to continue reading

Thank you for visiting UK-VET Equine and reading some of our peer-reviewed content for veterinary professionals. To continue reading this article, please register today.