. Common diseases of farm animals. Veterinary medicine. INFECTIOUS DISEASES OF CATTLE 317 The specific cause of actinomycosis is commonly known as the ray fnngns (Fig. 118). This fungus grows on certain plants, and the animal usually contracts the disease by eating plants or roughage that have the fungus on them. Grasses having awns that are capable of woundirig the mucous membrane of the mouth and penetrating the gums are most apt to produce the disease. Young cattle that are replacing and erupting their teeth are most prone to " lumpy ; (Conditions that favor bruising of the ja
. Common diseases of farm animals. Veterinary medicine. INFECTIOUS DISEASES OF CATTLE 317 The specific cause of actinomycosis is commonly known as the ray fnngns (Fig. 118). This fungus grows on certain plants, and the animal usually contracts the disease by eating plants or roughage that have the fungus on them. Grasses having awns that are capable of woundirig the mucous membrane of the mouth and penetrating the gums are most apt to produce the disease. Young cattle that are replacing and erupting their teeth are most prone to " lumpy ; (Conditions that favor bruising of the jaw and external wounds favor the develoj^ment of actinomycosis. The fungus grows in the tissues, causing an inflammatory reaction and destruction of the tissue. The ray fungus can be seen in the diseased tissue or the pus as yellow- ish, sj)herical bodies about the size of a grain of sand. Each of these bodies is formed by a large number of club-like bodies arranged about a cen- tral mass of filaments, il W "ft^'' The local symptoms are ir 1,0 -ru t •J L Fig. 118,—The ray fungus. characteristic (Fig. 117). The tumor may involve the soft tissues of the head. If the jaw- bone is affected the tumor feels hard and cannot be moved about. Sometimes it is soft and filled with pus. Tumors of long stand- ing may possess uneven, nodular surfaces and fistulous openings. When the tongue is affected, it is swollen and painful, and prehension and mastication of the food may be impossible. A\Tien the pharynx is the seat of disease, breathing and swallow- ing are difficult and painful. Actinomycosis of the lungs may present the appearance of a chronic pulmonary affection. If the disease involves the head and lungs, the animal may become unthrifty and emaciated. In doubtful cases a microscopic ex-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly
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Keywords: ., bookpublisherphilad, booksubjectveterinarymedicine, bookyear1919
