Aids to stockowners / by J. Walker.

  • John Walker
Date:
1930
Catalogue details

Licence: In copyright

Credit: Aids to stockowners / by J. Walker. Source: Wellcome Collection.

    83/198 page 65
    from whence it gains access t< ike tb nr ; abrasions of the mucous membranes of the mouth and site of eruption of the milk teeth is frequently the starting point of infection. Calves become affected as early as a few days after birth. The susceptibility of the young is increased by bad hygiene and improper feeding. The disease is easily transmitted from infected to clean calves by contact. Symptoms. The first symptom observed is a soreness of the mouth and increased salivation, due to the formation of a small yellowish point or points on the tongue or elsewhere in the mouth. These points at first are small but gradually increase in size, developing towards the later stages up to half an inch in radius. As the development proceeds in the mouth, the infection is swallowed with the food and sets up similar lesions in one or other of the stomachs. The infection sometimes invades the liver, again setting up necrotic areas; in some cases the pharynx, larynx and lungs become affected. When diarrhoea is present it points to involvement of the intestines; exceptionally there occurs swelling and suppuration of the 1 mph glands of the head and necrosis of the tissues of the feet between the claws or around the top of the hoof. The appearance of a fully-developed necrotic area is that ot an ulcer or ordinary open sore, deeply pitted, and containing a thick cheesv-like material. t Course. In cases which terminate fatally the animal becomes emaciated and weak apparently from the absorption of toxins, and death occurs in from four or five days to three weeks. In cases which recover, convalescence lasts several weeks. Post-mortem Lesions. C entres ot infection as described above may he found in advanced cases in the mouth, pharynx, larynx, lungs, stomach, h\ei and elsewhere. Emaciation of the carcass and anaemia will also be noted. Treatment. In the early stages, curative treatment may he of assist¬ ance, but slaughter is usually more economical. The treat¬ ment consists of the scraping of the necrotic centres with a blunt instrument and the application of an antiseptic once or
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