Nutritional analysis of gastric contents and body condition score at a single time point in feral horses in Australia.

This study examines the nutrient intake and body condition of wild Australian horses, noting that many horses fall below optimal health standards, despite no apparent ill-effects on their survival. The study proposes further research into the nutrient sources in these regions and possible revisions in optimal diet recommendations for horses.

Methods

• The researchers used the carcasses of 41 wild horses from five different Australian locations for their evaluations.
• Body condition scores (BCS), using a scale of 1 to 9, were determined, and the horses’ stomachs were then removed during postmortem examinations.
• The stomach contents were analyzed for various nutritional factors, and macroelement and microelement concentrations.
• These data were compared both amongst the different locations and against the recommended daily nutrient intakes for horses.

Results

• The study discovered that the average BCS varied by location with all horses considered moderately thin.
• It was found that the BCS for males was 1 to 3 points higher than that of females.
• Protein content in the stomachs of these horses ranged from 4.3% to 14.9% and was significantly associated with BCS.
• Amounts of water-soluble carbohydrate and ethanol-soluble carbohydrate in the stomach contents of the horses were higher than those expected for horses consuming high-quality forage.
• There were extreme variations in certain macroelement and microelement concentrations, with some being excessively high and others excessively low.
• No evidence of ill health was observed among the horses despite these nutrition imbalances.

Conclusions and Recommendations

• The findings of this analysis suggest that the diet of many different populations of wild horses in Australia was less than optimal.
• Despite low BCS and mineral deficiencies, these conditions did not appear to affect the survival of the horses.
• The researchers recommend further studies on both the food sources in these regions and the high carbohydrate concentrations.
• The identification of rich nutrient sources could lead to an understanding of the imbalances in the horses’ nutrition.
• The results of this study suggest that the current understanding and recommendations for an optimal diet for horses may need to be updated and made more accurate.