Small intestinal beta-galactosidase activity in the horse

Area of Science:

• Biochemistry
• Veterinary Science
• Mammalian Physiology

Background:

• Lactase activity is crucial for digesting lactose, the primary carbohydrate in milk.
• Understanding lactase enzyme dynamics in horses can provide insights into mammalian digestive development.

Purpose of the Study:

• To characterize the distinct lactase enzymes in the equine small intestine.
• To describe the developmental changes in activity for each enzyme from birth through adulthood.

Main Methods:

• Enzyme assays were performed on equine small intestine samples.
• Activity levels of neutral beta-galactosidase and acid beta-galactosidase were measured across different age groups.

Main Results:

• Neutral beta-galactosidase activity significantly decreased from birth to 3 years, vanishing by age 4.
• Acid beta-galactosidase showed reduced activity in the first three months, then stabilized, representing the adult horse's primary lactase enzyme.

Conclusions:

• Equine small intestine lactase activity is primarily due to acid beta-galactosidase in adults.
• This developmental pattern in horses may mirror that observed in many other mammals and human populations.