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Pathological studies on systemic mycoses in calves.

Y Chihaya1, Y Furusawa, H Okada

  • 1Department of Veterinary Pathology, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Japan.

The Journal of Veterinary Medical Science
|December 1, 1991
PubMed
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Systemic mycoses, particularly alimentary mucormycosis and aspergillosis, are significant in young calves. Antibiotic use for diarrhea and early weaning are identified as key predisposing factors for these fungal infections.

Area of Science:

  • Veterinary Pathology
  • Mycology
  • Animal Health

Background:

  • Systemic mycoses pose a threat to young livestock.
  • Understanding the prevalence and types of fungal infections in calves is crucial for herd health management.

Purpose of the Study:

  • To investigate the incidence and characteristics of systemic mycoses in young calves.
  • To identify common fungal pathogens and their pathological effects in calves.
  • To explore potential predisposing factors for alimentary mycosis in calves.

Main Methods:

  • Retrospective analysis of necropsy records from 406 calves under 6 months old over a 10-year period.
  • Histopathological examination of affected tissues to identify fungal species and lesions.
  • Correlation of findings with clinical history, including antibiotic administration and weaning practices.

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Main Results:

  • Systemic mycoses were diagnosed in 4.7% of calves, with alimentary mycosis being the most common form (63.2% of cases).
  • Mucormycosis (91.7%) and aspergillosis (41.7%) were the predominant causes of alimentary mycosis, characterized by hemorrhagic necrosis.
  • Pulmonary aspergillosis occurred in 52.6% of cases, presenting as micro-abscesses; mixed alimentary and respiratory infections were also noted.

Conclusions:

  • Mucormycosis and aspergillosis are significant fungal pathogens in young calves, affecting both the alimentary and respiratory tracts.
  • Antibiotic administration for diarrhea and early weaning are identified as critical predisposing factors for alimentary mycosis.
  • Further research into preventative strategies is warranted to mitigate the impact of these mycoses on calf health.