Response of horses to sweet, salty, sour and bitter solutions.

This study focuses on the taste preferences of young horses, finding that their reactions to sweet, salty, sour, and bitter substances echo those of certain ruminant animals.

Introduction to the Study and Methodology

• The research used a two-choice preference test to understand the taste reactions of five young horses to sweet, salty, sour, and bitter tasting solutions.
• The test worked by offering the horses two choices of fluids – one being tap water and the other being the test solution.

Findings from the Research

• The horses exhibited a preference for sucrose (sugar), consuming it at greater than 60% of their total fluid intake, at concentrations between 1.25 and 10 grams per 100 ml.
• When the sucrose solution had a concentration higher or lower than this range, the horses showed no preference for it (consuming it at 40% to 60% of their fluid intake).
• The horses didn’t show any interest in NaCI (salt) until it reached .63 grams per 100 ml concentration. Beyond this concentration, the horses started to reject the solution, with rejection becoming more pronounced as NaCI concentration increased to 5 grams per 100 ml.
• The horses remained indifferent to acetic acid (that gives vinegar its sour taste) up to a concentration of .16 ml per 100 ml. Beyond this concentration, the horses started to reject the solution.
• The horses maintained a non-partisan stance towards quinine (a bitter compound) at concentrations between .16 to 10 mg per 100 ml, but started to reject it at higher concentrations (20, 40, 80 mg per 100 ml).

Comparison with Ruminant Species

• The study noted that the taste reactions of young horses were very similar to those of some ruminant species, such as sheep.
• Just like ruminant species, individual horses demonstrated considerable variability in their response to a particular test compound.