The Waltham Equine Studies Group has announced the results of two pieces of research designed to improve understanding of the best nutritional support for older horses, whether they are healthy or diagnosed with Pituitary Pars Intermedia Dysfunction (PPID or Cushing's).The Waltham Equine Studies Group has announced the results of two pieces of research designed to improve understanding of the best nutritional support for older horses, whether they are healthy or diagnosed with Pituitary Pars Intermedia Dysfunction (PPID or Cushing's).

The first study: A comparison of nutrient digestibility between adult and aged horses, conducted by the Department of Large Animal clinical Sciences and Animal Science, Michigan State University and The Waltham Equine Studies Group, confirmed (in contrast to earlier work) that there was no difference in digestibility between healthy adult and aged horses when fed a variety of common equine diets.1 

In the second study: Characterisation of the faecal bacterial community in adult and elderly horses fed a high fibre high oil or high starch diet, the Institute of Biological Environmental and Rural Sciences, Aberystwyth University, The Waltham Equine Studies Group and Michigan State University used the same horses as the previous study but this time looked at their gut microflora. The results showed that although no significant differences in individual species of bacteria were found, ageing was, however, associated with a reduction in bacterial diversity. This, say the authors, may in part explain why older animals can be at increased risk of intestinal disturbances.2

An abstract that summarised part of the Waltham Equine Studies Group's work on the effect of additional supplementation on aged horses with and without PPID was presented at the 2nd Dorothy Havermeyer Geriatric Workshop in the USA last November.3 This work, carried out in conjunction with Dr Amanda Adams at the University of Kentucky showed that age is key in influencing inflammation and metabolism rather than whether the horse is PPID positive or not.

Professor Pat Harris, head of the Waltham Equine Studies Group, said: "For the parameters we monitored, the research showed that it is being old that is the issue, rather than having PPID." 

Clare Barfoot RNutr and the research and development manager at Spillers said: “This should give us a better understanding of the effects of diet and age on metabolism in order to determine optimal nutrition for the senior horse. Preliminary work suggests that this new research may change the way we think of feeding the older horse. Waltham’s work continues to ensure that Spillers feeds remain at the forefront of equine nutrition, for the better health of horses everywhere.”

References

  1. Elzinga, S., Nielsen, B.D., Schott II, H.C., Rapson, J., Robison, C.I., McCutcheon, J.,Harris, P.A., Geor, R (2014) Comparison of Nutrient Digestibility Between Adult and Aged Horses Journal of Equine Veterinary Science, 34 (10), pp. 1164-1169.
  2. Dougal K, de la Fuente G, HARRIS P, Girdwood SE, Pinloche E, et al. (2014) Characterisation of the Faecal Bacterial Community in Adult and Elderly Horses Fed a High Fibre, High Oil or High Starch Diet Using 454 Pyrosequencing. PLoS ONE 9(2): e87424. doi:10.1371/journal.pone.0087424
  3. Betancourt A, Harris  PA, Moffett  AD, McMurry  KE, Reedy  SE, Horohov DW, & Adam  AA (2014) Comparison of inflammation, nutritional status, muscle mass, pituitary function, and age in geriatric horses.

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