Controlling ocular squamous cell carcinoma in Hereford cattle

Area of Science:

• Veterinary Ophthalmology
• Cattle Health Management
• Neoplastic Disease Research

Background:

• Ocular lesions are a concern in cattle herds.
• Neoplastic ocular lesions can impact herd health and productivity.

Purpose of the Study:

• To evaluate the efficacy of cryosurgery for neoplastic ocular lesions in Hereford cattle.
• To determine optimal inspection intervals and treatment strategies for ocular lesions.
• To assess the natural regression rates of untreated ocular lesions.

Main Methods:

• 737 Hereford cattle across 3 herds were monitored over 20-242 days.
• Lesions >3mm were cryosurgically treated; smaller lesions were observed.
• Lesions increasing to 5mm were subsequently treated.

Main Results:

• Ocular lesion prevalence decreased from 8.1-45.7% to 1.5-8.8% over 3.5 years.
• 71% of treated lesions and 75% of small untreated lesions regressed.
• Lesion progression and new occurrences peaked in summer.

Conclusions:

• Cryosurgery is effective for neoplastic ocular lesions in cattle.
• 3-4 month inspection intervals, including summer checks, are recommended.
• Owners can effectively identify and present cattle with growing ocular lesions for treatment.