Blood parameters and turnover data in calves infested with lice.

Area of Science:

• Veterinary Parasitology
• Animal Physiology
• Hematology

Background:

• Naturally occurring infestations of young Ayrshire calves with the long-nosed sucking louse (Linognathus vituli) are common.
• Understanding the physiological impact of such infestations is crucial for animal health management.

Purpose of the Study:

• To investigate the erythrokinetic and plasma protein turnover in calves infested with Linognathus vituli.
• To quantify the impact of louse infestation on red blood cell dynamics and iron metabolism.

Main Methods:

• Erythrokinetic studies using chromium-51 (51Cr)-labeled red blood cells.
• Plasma iron turnover studies utilizing iron-59 (59Fe)-labeled transferrin.
• Albumin turnover assessment with iodine-125 (125I)-labeled albumin.
• Monitoring liveweight gain and appetite throughout the infestation period.

Main Results:

• Calves infested with Linognathus vituli did not develop anemia.
• A significant decrease in plasma iron turnover rates was observed in infested calves.
• Red blood cell survival time was significantly increased in the presence of lice.
• Liveweight gain was slightly greater in uninfested animals, though not statistically significant.
• Albumin catabolism and circulating red cell/plasma volumes remained largely unaffected.

Conclusions:

• Linognathus vituli infestation in calves alters iron metabolism and red blood cell kinetics without inducing anemia.
• The increased red blood cell survival time suggests a compensatory mechanism or reduced loss.
• Further research could explore the specific mechanisms behind these hematological changes.