to become ulcerated. Weeping and bleeding are com- mon and then bacteria invade causing festering and foul-smelling growths. The cancer then invades the deeper tissues around
the eye itself and may progress into the lymph node of the head and eventually to the other body organs such as the lungs and liver. Older cattle are more prone to cancer of the eye, as are white-faced animals with no skin pigment around the eye. Cancer eye has been estimated to be moderately heritable. Welfare considerations today frown on the develop-
ment of cancer eye in cattle to an advanced stage, causing severe pain and suffering of the animal. Inspect live- stock regularly and cull infected animals immediately. Treatment is another option in the early stages.
Electrocautery (burning) or cryosurgery (freezing), as well as scalpel surgery and removing the third eyelid, or removing an entire eye, can sometimes be valid op- tions. Remember, handling vision-impaired animals can be very dangerous.
Pinkeye and other eye conditions There are several systemic diseases that can have ocular lesions. These include IBR, BVD, listeriosis and
PRIVATE TREATY CARCASS DATA
malignant catarrhal fever, all of which are diffi cult to diagnose. If multiple symptoms are seen, consult a veterinarian. Ocular whitening of the cornea from IBR will usu-
ally start in the center of the cornea and often an ulcer will develop as well, similar to pinkeye. With cattle that develop corneal lesions with BVD,
the cloudy opacity of the cornea generally starts at the limbus, where the white part of the eye meets the cornea, which is the clear part. It progresses to the center and eventually clouds the entire cornea. Again, most of the time these animals are sick with respira- tory symptoms. The other infective causes of eye lesions are viral
in nature and cause clouding of the cornea and con- junctivitis, which is simply an infl ammation of the soft tissues surrounding the eye and eyelids. This causes sensitivity to sunlight and the cattle will squint or close their eyes. There will usually be a discharge from the eye as well. True pinkeye, or infectious bovine keratoconjuncti-
vitis, is found wherever there are cattle. Death directly due to the disease is rare, but economic consequences can be severe due to slow growth of calves, reduced
Since 1952 – Crockett, Texas
BULLS ANGUS CHAROLAIS
HEREFORDS REGISTERED
18-24 MONTHS • EPDs READY FOR HEAVY SERVICE
OPEN AND BRED HEIFERS COWS AVAILABLE
CALL FOR AN APPOINTMENT TODAY BILL CLARK
936-544-9013 Gene Stokes, Manager
Website:
www.clarkangus.com Email:
clarkangus@aol.com
tscra.org July 2014 The Cattleman 47
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