Hematological and Biochemical Profiles in Mule and Horse Neonates from Birth to 30 Days of Age: A Comparative Study with Clinical Perspectives.

Overview

• This study compares blood and biochemical parameters between mule and horse newborns from birth to 30 days old to establish differences and provide reference data for clinical use.

Background and Objective

• There is a scarcity of studies evaluating hematological (blood cell-related) and biochemical values specifically in mule foals.
• Existing neonatal reference data are limited, making clinical assessments challenging.
• The main goal was to compare these blood and biochemical parameters over the first month of life between mule and horse neonates to identify differences and aid veterinary clinical assessments.

Methods

• The study sample included 15 mule and 16 horse neonates (newborns).
• Blood samples were collected at several key time points: immediately at birth, 12 and 24 hours after birth, then at 7 and 30 days old.
• Various hematological parameters (like red and white blood cells, hemoglobin, platelets) and biochemical markers (such as albumin, calcium, electrolytes, iron, liver enzymes, glucose, cholesterol, and others) were measured.

Key Findings – Parameters Higher in Mule Neonates

• Mean Corpuscular Hemoglobin Concentration (MCHC): Higher in mules, indicating a greater concentration of hemoglobin in red blood cells.
• Platelet count: Mules showed significantly more platelets, important for blood clotting.
• Albumin: Higher in mules, a protein important for blood volume and pressure maintenance.
• Electrolytes: Calcium, chloride, and magnesium levels were elevated in mule foals, which are critical for muscle function, nerve conduction, and cellular processes.

Key Findings – Parameters Lower in Mule Neonates

• Iron: Lower in mules, essential for red blood cell production and oxygen transport.
• Total leukocytes (white blood cells): Lower counts indicate possible differences in immune cell populations.
• Segmented neutrophils & lymphocytes: Specific white blood cell types that were lower in mules, suggesting variations in immune response or development.
• Neutrophil:lymphocyte ratio: Lower in mules, a marker often related to stress or inflammation differences.
• Fibrinogen: Lower levels, a protein involved in blood clotting.
• Bilirubin (total, direct, indirect): All lower in mule foals, indicating differences in red blood cell breakdown or liver function.
• Cholesterol: Lower, which could influence cellular membrane composition or hormone production.
• Creatine phosphokinase (CK): Lower enzyme levels involved in muscle metabolism.

Group × Time Interaction Effects

• Differences in parameters changed depending on the age/time point:
• Lower red blood cells, hematocrit (proportion of blood occupied by red cells), and hemoglobin in mules at 12–24 hours.
• Lower total leukocytes and segmented neutrophils in mules consistently at birth, 12 hours, 7 days, and 30 days.
• Glucose was lower in mules at birth but increased relative to horses at 12–24 hours.
• Urea, a marker of protein metabolism and kidney function, was higher in mules at 7 days.
• Triglycerides, important energy stores, were lower in mules at 12 hours and 7 days.
• CK and iron remained lower in mules specifically at 12–24 hours.

Conclusions and Clinical Implications

• Neonatal mule foals have distinct hematological and biochemical profiles compared to horse foals during their first month.
• These differences highlight the need for species-specific reference values rather than using horse norms when assessing the health of mule neonates.
• Understanding these differences can aid veterinarians in diagnosing and managing health issues more accurately in mule foals.
• The study provides valuable baseline data for clinical veterinary medicine, improving neonatal care for mules.