Effect of gender and exercise on haematological and biochemical parameters in Holsteiner horses.

This research aimed to investigate the effect of average intensity exercise on various health indicators in Holsteiner horses, distinguishing between males and females. It found differences between the two sexes regarding blood cell counts and other biochemical markers after exercise, with stallions in particular showing increased oxidative stress.

Brief Highlights of the Study

• Seventeen Holsteiner horses (7 females and 10 males) of around 6 years of age participated in the study, which assessed the effect of moderate exercise on different haematological (blood-related) and biochemical parameters.
• The research explored a broad range of health indicators, including values for different types of blood cells (like red and white blood cells, platelets), their related attributes (such as haemoglobin concentration, mean corpuscular volume), and serum (liquid part of blood) concentrations of enzymes, as well as measures of oxidative stress.

Key Findings

• Males showed a significant increase in leucocytes (white blood cells), granulocytes (a type of white blood cell), erythrocytes (red blood cells), haemoglobin and haematocrit levels after the exercise test. This could indicate a more robust physiological response to stress or injury in stallions.
• Females, on the other hand, demonstrated a significant decrease in platelet volume following the exercise test. The exact implication of this is not clear, but it might suggest that exercise affects clotting mechanisms differently in mares.
• Following physical exertion, stallions displayed a notable increase in aspartate aminotransferase activity, an enzyme that, when released into blood, is often associated with tissue damage or inflammation. It reflects that intensity of exercise had a certain impact on muscle or liver cells in stallions.
• Both mares and stallions displayed a decrease in lipid peroxidation after exercise, which could mean training makes their bodies more efficient at reducing or dealing with this potentially damaging process.
• Stallions also showed increased amounts of oxidative modified protein in their red blood cells following exercise, potentially highlighting increased levels of oxidative stress induced by exercise in males.
• No significant changes were observed in the resistance of red blood cells to acidic conditions (tested using 0.1 m HCl) or the percentage of burst open (or haemolysed) red blood cells following exercise in either group.

Conclusions and Future Directions

• The research provides valuable information on gender-specific effects of exercise on various haematological and biochemical markers in Holsteiner horses, which could have implications for their health and fitness assessments.
• It highlights potential gender-specific vulnerabilities, such as the possibly higher susceptibility of males to tissue damage or oxidative stress and differing clotting responses in females.
• Future research might need to further elaborate on these initial findings, including other factors that can influence these parameters, such as age, diet, type and intensity of exercise, in addition to considering larger and more diverse samples to generalize the results.