Elfadil A A, Vaillancourt J P, Meek A H, Julian R J, Gyles C L
Department of Population Medicine, Ontario Veterinary College, University of Guelph, Canada.
Avian Dis. 1996 Jul-Sep;40(3):690-8.
A total of 110 broiler flocks processed in a single processing plant in southern Ontario were studied for purposes of describing the cellulitis lesions and investigating possible associations between cellulitis and other categories of condemnation at the processing plant. Two hundred and ninety-five carcasses condemned for cellulitis were examined. They came from 65 of the 110 flocks. The lesions tended to be unilateral with most carcasses (87%) having one lesion. The majority of the lesions (92%) were located on the abdomen. Almost 65% of the lesions were large (> or = 8.1 cm2), and 27% were medium (2.1-8.0 cm2). On the basis of gross appearance, 69% of the lesions were classified as severe, 26% moderate, and 5% mild. Of 149 lesions examined histologically, 74% were classified as chronic, 21% ongoing, and 5% mild-acute. Condemnation data from the 110 broiler flocks were analyzed using Poisson regression. Simple relationships were examined between a count outcome (number of cellulitis-condemned carcasses per flock) and other categories of condemnation and average bird weight. Cellulitis was significantly associated with average bird weight (P = 0.0018), Escherichia coli-related conditions (SEROSITIS; P < or = 0.0001), ascites (P = 0.0004), cyanosis (P < or = 0.0001), valgus varus deformity (P < or = 0.0001), REJECT (combined carcass condemnations for bruising, mutilation, and contamination; P = 0.0003), and the interaction terms "average bird weight and ascites" (AVWTASCIT; P < or = 0.0001) and "average bird weight and cyanosis" (AVWTCYAN; P < or = 0.0001). Average bird weight, SEROSITIS, ascites, cyanosis, valgus varus deformity, and AVWT*ASCIT were the only significant factors after adjusting for clustering. No association was observed between cellulitis and emaciation and dead on arrival. Variables significantly associated with cellulitis in the multivariate analysis could be considered as potential predictors. These predictors may share common risk factors predisposing broiler chickens to cellulitis.
为了描述蜂窝织炎病变，并调查加工厂中蜂窝织炎与其他类别判废之间可能存在的关联，对安大略省南部一家加工厂处理的110个肉鸡群进行了研究。检查了295具因蜂窝织炎而被判废的胴体。它们来自110个鸡群中的65个。病变往往是单侧的，大多数胴体（87%）有一处病变。大多数病变（92%）位于腹部。几乎65%的病变较大（≥8.1平方厘米），27%为中等大小（2.1 - 8.0平方厘米）。根据肉眼外观，69%的病变被分类为严重，26%为中度，5%为轻度。在149个经组织学检查的病变中，74%被分类为慢性，21%为进行性，5%为轻度急性。使用泊松回归分析了110个肉鸡群的判废数据。研究了计数结果（每群中因蜂窝织炎被判废的胴体数量）与其他判废类别以及平均禽重之间的简单关系。蜂窝织炎与平均禽重（P = 0.0018）、大肠杆菌相关病症（浆膜炎；P≤0.0001）、腹水（P = 0.0004）、发绀（P≤0.0001）、内外翻畸形（P≤0.0001）、拒收（因瘀伤、残缺和污染导致的胴体综合判废；P = 0.0003）以及交互项“平均禽重和腹水”（AVWTASCIT；P≤0.0001）和“平均禽重和发绀”（AVWTCYAN；P≤0.0001）显著相关。在调整聚类后，平均禽重、浆膜炎、腹水、发绀、内外翻畸形和AVWT*ASCIT是仅有的显著因素。未观察到蜂窝织炎与消瘦和到场死亡之间的关联。多变量分析中与蜂窝织炎显著相关的变量可被视为潜在预测因素。这些预测因素可能共享使肉鸡易患蜂窝织炎的共同风险因素。
