Effect of Dose and Fasting on Oral Sugar Test Responses in Insulin Dysregulated Horses.

This research article investigates how fasting and different doses of oral sugar test (OST) impact insulin response in insulin dysregulated horses. The research suggests that insulin dysregulated horses had significantly higher insulin responses than non-insulin dysregulated horses. The study, however, found no significant difference in insulin responses between low and high OST doses.

Research Purpose and Methodology

• The main purpose of this research was to examine the impact of fasting and varying oral sugar test (OST) doses on insulin responses in insulin dysregulated (ID) horses. This targets understanding the effect of blood sugar levels on insulin regulation of horses for better management of ID conditions.
• Twenty-one mixed-breed horses with different insulin conditions (ID and non-insulin dysregulated or NID) were used for this study. In two separate studies (A and B), different experimental conditions were implemented.
• In Study A, horses underwent an OST with either a fast (FA) prior to the OST, or directly after feeding off pastures (FE). This was designed to understand the effect of a horse’s dietary conditions on insulin response.
• Further, in Study B, horses were given either a low dose (LD) or high dose (HD) OST on one occasion to examine dose-dependent insulin response.
• Blood samples were taken before and an hour after the OST to determine insulin concentrations.

Research Findings

• The study found that ID horses had significantly more pronounced insulin reactions than NID horses under all OST conditions. This highlights the sensitivity of ID horses towards sugar ingestion.
• The research however did not find a statistical difference between low dose versus high dose mean insulin concentrations for either ID or NID horses, suggesting both doses similarly trigger insulin response.
• The study found ID horses had higher basal insulin levels after continuous feeding prior to the OST as compared to fasting before the OST. This suggests that the immediate dietary condition of a horse might affect its insulin response.
• However, the state of fasting or feeding didn’t significantly impact insulin concentrations an hour after the OST, indicating that the body’s response to regulate insulin post sugar ingestion was not largely affected by the horse’s immediate dietary history.

Implications

• This research provides insights into managing insulin dysregulation in horses. Understanding the insulin responses under different dietary conditions and OST doses helps in formulating effective dietary planning and OST protocol for horses with insulin dysregulation.
• The findings could lead to better strategies for managing horse health, especially those suffering from insulin dysregulation.