Broiler meat is a high-quality food for humans, and is worldwide consumed. Brazil plays an important role in the poultry industry and in its South region is situated the most important producer. Recently, alterations on the meat aspect have aroused the interest of researchers to clarify their causes. The objective of this investigation was to evaluate the relationship between environmental conditions and seasons on the prevalence of Dorsal Cranial Myopathy (DCM) and also, to generate a DCM classification in scores, for griller-type broilers. Carcasses were picked out from several stages of industrial processing from a slaughterhouse located in South Brazil. The prevalence of DCM was measured using the database of partial condemnations of the Official Inspection Service during 19 months. Meteorological data were obtained from the National Institute of Meteorology (in Portuguese Instituto Nacional de Meteorologia- INMET), of the Ministry of Agriculture, Livestock and Supply. In addition, microorganisms with public health importance were measured on samples taken from the muscles with DCM. The prevalence of DCM was compared among seasons using Analysis of Variance (ANOVA). The relation with other environmental conditions was accessed using a principal component analysis. Partial condemnations by DCM were higher (P < 0.001) during autumn (0.529%) and winter (0.547%). In the other extreme, summer presented the lowest percentage of condemned carcass (0.199%). The prevalence of DCM appeared to be inversely related to the temperatures. The association between relative humidity and the prevalence of DCM seemed to move in the same direction. No differences were observed in the qualitative and quantitative microbiological analysis between carcasses affected by DCM and the control group (P > 0.05). Visually, it could be noted that the hemorrhagic lesion of the Anterior latissimus dorsi (ALD) muscle diminished during the processing line, making the DCM imperceptible, even in those carcasses with severe DCM score at the beginning of the process. In conclusion, the climate features approached here could be correlated to this emerging myopathy. However, this lesion does not represent a food security issue for the consumers regarding evaluated microorganisms, as this kind of lesion tends to disappear in the final sellable product.

肉鸡是人类的优质食品，在全球范围内消费。巴西在家禽业中发挥着重要作用，其南部地区是最重要的生产国。最近，肉类方面的变化引起了研究人员的兴趣，以澄清其原因。本次调查的目的是评估环境条件和季节与背侧颅肌病 ( DCM)患病率之间的关系。) 并且还为烧烤型肉鸡生成分数的 DCM 分类。屠体是从位于巴西南部的屠宰场的几个工业加工阶段中挑选出来的。DCM 的患病率是使用官方检验服务机构在 19 个月内部分谴责的数据库来衡量的。气象数据来自农业、畜牧业和供应部的国家气象研究所（在葡萄牙国家气象研究所-INMET）。此外，对从肌肉中采集的 DCM 样本测量了具有公共卫生重要性的微生物。使用方差分析( ANOVA ) 比较各季节 DCM 的患病率）。使用主成分分析访问与其他环境条件的关系。DCM 的部分谴责在秋季 (0.529%) 和冬季 (0.547%)较高 ( P < 0.001)。在另一个极端，夏季报废屠体的百分比最低 (0.199%)。DCM 的流行似乎与温度成反比。相对湿度与 DCM 患病率之间的关联似乎朝着相同的方向发展。DCM影响的屠体与对照组之间的定性和定量微生物学分析没有观察到差异（P > 0.05）。视觉上，可以注意到背阔肌前部（ALD）的出血性病变) 生产线期间肌肉减少，使得 DCM 难以察觉，即使在加工开始时具有严重 DCM 评分的屠体也是如此。总之，这里讨论的气候特征可能与这种新出现的肌病有关。然而，这种损伤并不代表消费者对所评估微生物的食品安全问题，因为这种损伤往往会在最终可销售的产品中消失。