Abstract
For detecting a possible relation between claws lesions and the lesions of carpo-digital joint capsule, the nearest joint to the claws, with an importance in diagnosing the exact cause of lameness in sheep resulting to be brought for casualty slaughter. For that goal 128 front limb were collected from slaughtered sheep at Mosul abattoir for period from 5-25/2/2013, the gross examination was made for observing the claws lesions and the synovial capsule were harvested, preserved and prepared for histopathologic examination, then examined microscopically with recording lesions. the correlation coefficient values were estimated between claws affection and joint capsular lesions at the same limb. Results demonstrated affection of 83 limbs with claws lesions as foot rot and erosions at incidence ratio 64.84%. The histopathological examination revealed a chronic type of changes including Fibroplasia in both synovium and tunica densa at incidences 8.59% and 6.25% respectively, Foci of hyperplastic synovial lining at 4.68% of samples, adipose tissue marbleizing synovium at 7.03% of the examined sections. Mild degree of chronic synovitis was observed within 10.93% of total samples, connective tissue metaplasia was evident at 3.9% of sections at tunica densa layer, the arteriolar musculature showed vacuolation at 18.75% of samples. The correlation coefficient value was significantly positive between occurrence of foot rot disease and the incidence of chronic synovitis in carpo-digital joint capsule which can be considered as the most important conclusion in the study.
Highlights
The claws affection in sheep, Foot rot or so called infectious pododermatitis is one of the infectious diseases causes economic losses in small ruminants [1], the gram negative bacteria Dichelobacter nodusus is considered the main causative agent of it [2], other organisms as Fusobacterium necrophorum plays an important role in progression of pathogenesis and formation of lesions [3]
For that goal 128 front limb were collected from slaughtered sheep at Mosul abattoir for period from 5-25/2/2013, the gross examination was made for observing the claws lesions and the synovial capsule were harvested, preserved and prepared for histopathologic examination, examined microscopically with recording lesions. the correlation coefficient values were estimated between claws affection and joint capsular lesions at the same limb
Mild degree of chronic synovitis was observed within 10.93% of total samples, connective tissue metaplasia was evident at 3.9% of sections at tunica densa layer, the arteriolar musculature showed vacuolation at 18.75% of samples
Summary
The claws affection in sheep, Foot rot or so called infectious pododermatitis is one of the infectious diseases causes economic losses in small ruminants [1], the gram negative bacteria Dichelobacter nodusus is considered the main causative agent of it [2], other organisms as Fusobacterium necrophorum plays an important role in progression of pathogenesis and formation of lesions [3]. Foot affections are the most observable cause of inducing lameness in sheep, Arthritis, the inflammation of joints appears to record high incidences in these animals through affecting one or two joints in the limb including knee joint, carpal or tarsal joints with swelling, the younger animals or lambs are the most susceptible than adults according to [9], he reported that the most common causative agent that can be isolated and cultured from the inflamed joint are Streprococci, E.coli, Erysiplothrix rhusipathiae and Fusobacterium necrophorum, describing the inflamed joint as swollen, hot and painful. Lameness can appear as a complicated case containing both foot lesions and arthritis on the same affected limb It stated by [16] that Microorganisms can lodge in joints through hematogenous dissemination or by contiguous spread from osteomyelitis or a soft tissue abscess. The joint capsule is an important component of the joint and vital for its function that mainly composed from dense fibrous tissue, it is attached to the bone and forms sleeve around joint, the capsule may exposed to an injurious agent through rheumatoid arthritis or osteoarthritis or aging leaving variable changes on it [17]
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