The effect of form on equine salt intake.

Overview

• This study investigated whether the form of salt (block or loose) affects salt intake in horses.
• The main finding was that the form of salt did not significantly affect intake, but individual horses varied greatly in how much salt they consumed.

Background

• Equine nutrition requires essential minerals such as sodium and chloride.
• These minerals are typically provided as sodium chloride (salt) through compressed salt blocks.
• Understanding how salt intake varies with form is important for ensuring horses receive adequate nutrition.

Study Objective

• To compare the voluntary intake of salt between two forms: compressed salt blocks versus loose salt.
• To determine if the form affects how much salt horses consume daily.

Methods

• Sixteen mature horses were included in the study.
• Horses were blocked by housing style to control for environmental factors.
• They were assigned to receive either block salt or loose salt for four consecutive 7-day periods.
• Salt intake was measured by weighing the remaining salt at the end of each 7-day period.
• Statistical tests assessed effects of salt form, time period, and individual horse variation on salt consumption.

Findings

• No significant difference in salt intake was observed between the block salt and loose salt groups (P = 0.070).
• Salt intake did not significantly vary across the four measurement periods (P = 0.902), indicating stable consumption over time.
• A strong individual horse effect was found (P < 0.001), showing that consumption varied greatly from one horse to another.
• Daily salt intake ranged widely from as low as 2 grams to as high as 135 grams among the horses.
• More than half of the horses failed to consume enough salt to meet their nutritional requirements.

Conclusions and Implications

• The physical form of salt (block vs loose) does not affect how much salt horses will voluntarily consume.
• Individual variation is a major factor in salt intake, with some horses consuming insufficient amounts.
• Because of this variability, horses that do not consume enough salt voluntarily should be supplemented directly in their feed.
• Water intake also varies significantly, though this study focused primarily on salt intake.
• Providing salt blocks alone may not guarantee adequate sodium and chloride intake for all horses.

Practical Recommendations

• Horse owners and caretakers should monitor individual horse salt consumption rather than rely solely on providing salt blocks.
• Consider supplementing salt directly into daily feed rations for horses that consume little or no salt voluntarily.
• Ensure salt intake meets the recommended nutritional levels to avoid deficiency and maintain horse health.