[Clinical changes in whole-body irradiated cattle]

Area of Science:

• Veterinary Radiology
• Radiation Biology
• Animal Science

Context:

• Acute radiation sickness (ARS) impacts young livestock, necessitating clear diagnostic criteria.
• Understanding dose-dependent effects is crucial for animal health management and research.
• Cobalt-60 (60Co) sources are utilized in various scientific and medical applications, including animal studies.

Purpose:

• To characterize the clinical manifestations of acute radiation sickness in heifers following exposure to varying doses of 60Co gamma radiation.
• To establish distinct forms of radiation sickness based on observable clinical signs, latent period, and survival duration.
• To correlate radiation dose with the severity and progression of ARS in a juvenile bovine model.

Summary:

• Heifers aged seven to nine months were exposed to 60Co gamma radiation at doses of 3.7, 2.0, and 1.2 J/kg (450, 250, and 150 R).
• Distinct clinical stages of ARS were observed, allowing for differentiation into severe, medium, and light forms.
• Key differentiating factors included the intensity of clinical signs, duration of the latent stage, and overall survival time, with higher doses resulting in more severe outcomes and shorter survival.

Impact:

• Provides a framework for diagnosing and classifying ARS in young cattle based on clinical presentation.
• Informs risk assessment and mitigation strategies for accidental radiation exposure in livestock.
• Contributes to the understanding of radiosensitivity and radiation injury mechanisms in mammals.