The prevention of experimental deep pectoral myopathy of the fowl by fasciotomy

Siller, W. G.; Martindale, L.; Wight, P.A.L.

doi:10.1080/03079457908418355

Cited by 13 publications

(13 citation statements)

References 8 publications

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“…But vascular lesions of an obliterative kind external to the necrotic muscle were so rare in our study that they could not cause the ischaemic necrosis. Furthermore, we recently have shown that the broiler myopathy after electrically or voluntarily induced contractions of the supracoracoid [ 18, 211 may be prevented by surgical incision of the fascia, which covers that muscle [17]. This finding means that the immediate cause of the ischaemia is compression of the blood vessels because swelling of the contracting supracoracoid is prevented by its fascia and the adjacent sternum.…”

Section: Discussionmentioning

confidence: 76%

Pathology of Deep Pectoral Myopathy of Broilers

Wight

Siller

1980

Vet Pathol

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Abstract. Deep pectoral myopathy occurred in 39 of 204 apparently healthy and 46 of 146 ill, adult broiler breeders from Poultry Research Centre flocks. Both sexes and two commercial strains were similarly affected. The myopathy was not associated with any disease except pododermatitis.The supracoracoid was the only muscle affected. It was bilaterally involved in 33 chickens. The lesions were grouped macroscopically into three categories: acute oedema progressing to a green necrosis, centrally located cicatrix, and replacement of the caudal region by fibroadipose tissue. Microscopically the green lesion consisted of necrotic, anucleate muscle fibres devoid of inflammatory cells and surrounded by a fibrous capsule that had a reactive inner border and externally abutted on normal and regenerating muscle or fibro-adipose tissue. Considered with the ultrastructural findings of early loss of glycogen and disintegration of sarcoplasmic reticulum, mitochondria, nuclei and Z lines, these findings indicate that the condition is an ischaemic necrosis. There was no evidence that its primary cause was occlusive vascular lesions. The muscle was able to regenerate unless extensive secondary neurological lesions were present.Deep pectoral myopathy, known colloquially as green muscle and Oregon disease, is a necrotic condition of the supracoracoid muscle of certain domestic species of Galliformes. It was first observed in breeder turkey hens [5] and several studies on the condition in turkeys have since been published. Only brief reports [8,12,14) record that a similar disease also affects heavy breeds of chickens. Materials and MethodsThree hundred and fifty birds between 35 and 63 weeks old were examined. They were derived from two commercial strains of adult broiler breeders of both sexes and had been used primarily for nutritional and egg production trials. Sixty-six died in the course of the study, 80 were killed because of lameness resulting from pododermatitis, and the remaining 204 were apparently healthy birds killed at the completion of the trials. The last groups included 39 and 38 birds on which the effects of feeding restricted and unrestricted rations respectively were being studied in the primary experiment. In all cases the birds were fed practical broiler breeder diets supplemented with adequate mineral and vitamin mixes. Some birds were housed in pens, others in cages.Blocks of diseased and unaffected supracoracoid muscles were fixed in Bouin's solution. Paraffin sections were stained with haematoxylin and eosin (HE), a trichrome method, Verhoeff-van Gieson's stain, periodic acid-Schiff (PAS) with and without diastase digestion,

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Section: Discussionmentioning

confidence: 76%

Pathology of Deep Pectoral Myopathy of Broilers

Wight

Siller

1980

Vet Pathol

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“…The ischaemia due to nerve-stimulation in broilers persisted for at least 24 h but by then it was restricted to approximately the middle 1 /3 of the supracoracoid. This position is exactly that in which the great majority of necrotic lesions are found in both spontaneous and experimental (Siller et al, 1979a) deep pectoral myopathy. Lewis (1936) suggested that circulatory arrest for 30-60 min was followed by complete recovery but periods of 6-12 h resulted in muscle death and after 12-20 h nerve destruction ensued.…”

Section: Discussionmentioning

confidence: 87%

“…The thin, tough fascia which covers the ventrolateral surface of the supracoracoid muscle was opened under general anaesthesia using the special shielded scalpel and the techniques described by Siller et al (1979a). This was followed by immediate bilateral neurostimulation.…”

Section: Experiments 2 Neurostimulation With Fasciotomymentioning

confidence: 99%

“…The condition has been reproduced experimentally in a strain of light-weight laying hens by occluding the subclavian artery (Siller et al, 1978) and in broiler breeder hens (a) by electrical stimulation of the muscle, either directly or via the pectoral nerve (Wight et al, 1979) or (b) by exercising the flight muscles to exhaustion (Siller et al, 1979b). Furthermore, evidence has been produced (Siller et al, 1979a) to suggest that the cause of the localised ischaemic necrosis lies in mechanical strangulation of the supracoracoid muscle within the osteofascial compartment, so that the pathogenesis appears to be analogous to that of "March gangrene" of man (Blandy and Fuller, 1957).…”

Section: Introductionmentioning

confidence: 99%

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Effects of subfascial pressure in experimental deep pectoral myopathy of the fowl: An angiographic study

1979

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“…The lesion reported by Orr and Riddell (1977), Jones et al (1978) and Wight and Siller (1980) was confined to the deep pectoral muscle (Musculus supracoracoideus) and has recent been shown to be an exercise-induced lesion (Siller et al, 1979a) that can be experimentally prevented by fasciotomy (Siller et al, 1979b). A myopathy that principally affected the deep pectoral muscle and to a lesser extent the M. pectoralis and M. ambiens of 27-32-week-old breeder hens was found by Page and Fletcher (1975) to be selenium and vitamin E-responsive, in spite of the fact the analysis of rations showed adequate levels of these constituents.…”

Section: Introductionmentioning

confidence: 99%

Acute pectoral myopathy in broiler breeders

Randall

1982

Avian Pathology

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The prevention of experimental deep pectoral myopathy of the fowl by fasciotomy

Cited by 13 publications

References 8 publications

Pathology of Deep Pectoral Myopathy of Broilers

Pathology of Deep Pectoral Myopathy of Broilers

Effects of subfascial pressure in experimental deep pectoral myopathy of the fowl: An angiographic study

Acute pectoral myopathy in broiler breeders

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