Degenerative myopathy of the supracoracoideus (DMS) in turkeys and broiler chickens, Review

칠면조와 육계에서 청색증 발생기전에 관한 고찰

  • Song, Hee-Jong (Department of Infectious Diseases & Avian Diseases, College of Veterinary Medicine, Chonbuk National University) ;
  • Lee, Myung-Woo (Halim Co. Ltd) ;
  • Ryu, Kyeong-Sun (Department of Animal Resources & Biotechnology, College of Agriculture & Life Science, Chonbuk National University) ;
  • Jang, Hyung-Kwan (Department of Infectious Diseases & Avian Diseases, College of Veterinary Medicine, Chonbuk National University)
  • 송희종 (전북대학교 수의과대학 전염병학교실 및 조류질병학교실) ;
  • 이명우 ((주)하림) ;
  • 류경선 (전북대학교 농업생명과학대학 동물자원과학부) ;
  • 장형관 (전북대학교 수의과대학 전염병학교실 및 조류질병학교실)
  • Published : 2008.03.30

Abstract

Deep pectoral myopathy (DPM), also known as Oregon muscle disease or green muscle disease, was first described in 1968 by Dickinson et al as "degenerative myopathy" in turkeys. Even though this condition was first recognized in adult meat-type turkey and chicken breeders, it is becoming more and more common in meat-type growing birds. DPM occurs exclusively in birds that have been specially selected for breast muscle development. It is generally recognized that DPM is an ischemic necrosis that develops in the deep pectoral muscle (supracoracoideus or pectoralis minor muscle) mainly because this muscle is surrounded by inelastic fascia and the sternum, which do not allow the muscle mass to swell in response to the physiological changes occurring when muscle are exercised, as in wing flapping. The lesion does not impair the general health of birds and is generally found during cut-up and deboning, moreover, it can be both unilateral or bilateral, affecting just one or both pectoralis minor muscle, respectively. No public health significance is associated to DPM, but it is aesthetically undesirable. The fillet should be removed, whereas the rest of the carcass is still fit for human consumption. However, the required trimming operations determine the downgrading of the products and produce an economic loss for the industry, especially because it affects the more valuable part of the carcass. The incidence of DPM increases with market weight in broilers, with more cases reported in higher-yielding strains and in males. Increased bird activity (flock nervousness, flightiness, struggle, and wing flapping) induced by factors such as feed or water outages, lighting programs and intensity, human activity, and excessive noises in and around chicken houses should be looked at as a trigger for the development of DPM in broiler. However, most of the studies conducted to evaluate the incidence of DPM in poultry are concerned with parental commercial breeding stocks under experimental conditions (Bianchi et al. 2006. Poult Sci 85 : 1843-1846). There is a possible genetic relationship between the selection for large-breasted birds and this condition. Management procedures that discourage excessive wing flapping would reduce the incidence (Jordan and Pattison. 1998. Poultry diseases. 398-399).

Keywords

References

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