Humoral, hormonal and behavioral correlates of feeding in ponies: the effects of meal frequency.

This study investigates how the frequency of meals impacts various physiological aspects, including body fluid levels, glucose levels, triiodothyronine (T3) levels, heart rate, and behavior in ponies. The research suggests that larger single meals lead to more significant changes in all measured variables compared to smaller, more frequent meals, provided the total daily food intake remains consistent.

Introduction

• The study focuses on findings related to the impact of meal frequency on various biological markers in ponies. They were either given one or six meals per day using a simple reversal design.

Nutritional Intake and Physiological Measurements

• Topics of interest explored in this study include plasma levels of glucose, T3, protein, osmolality, and the heart rate. Changes in these parameters were observed before and after meals.
• The study held the total daily food intake constant for the ponies, altering only the frequency of meals. This was done to observe the effect of meal frequency independently from the total calorie intake.

Findings

• The study revealed a rise in plasma levels of glucose, T3, protein, and osmolality subsequent to feeding the ponies.
• A noticeably higher rise in all these variables was observed following a single large meal compared to six smaller meals.

Heart Rate and Behavioral Observations

• Behavioural findings indicated a rise in heart rate from 42 to 50 beats per minute when food was visible to the ponies. The heart rate, however, did not increase further once they started eating.
• There were no significant differences noted in the cardiac response to one large meal and that to a smaller meal.

Conclusion

• The study underscores the role of mealsize and feeding frequency on physiological parameters in ponies. Notably, it reveals that the body’s response to food intake, in terms of biological markers and heart rate, varies depending on the meal size rather than the total amount of food consumed within a day.