ABSTRACT In this study, the effect of grinding or pelleting of rapeseed on the digestibility, apparent metabolisable energy (AMEN), growth performance and gizzard weight of broiler chickens was evaluated. In Exp. 1, four treatments were tested (240 broiler chickens, 20 replications, 3 birds per cage). Birds received either a basal diet or were fed with rapeseed of different sized particles (fine, medium and coarse ground, respectively). In Exp. 2, 10 treatments were assessed (360 chickens, 12 replications, 3 birds per cage), where five different diets (a basal diet and four diets with intact rapeseed, fine ground, medium ground or coarse ground rapeseed, respectively) were fed non-pelleted or pelleted. In Exp. 3, two treatments were compared (224 broiler chickens, 14 replications, 8 birds per floor pen): fine ground rapeseed (FG) and intact rapeseed (IS). Compared with medium and coarse ground rapeseed, fine grinding increased in Exp. 1 the AMEN of rapeseed and the precaecal digestibility (PD) of dry matter and ether extract (EE) (p < 0.05). In Exp. 2, the content of AMEN and the PD of EE and crude protein (CP) increased as the degree of grinding increased when diets were not pelleted (p < 0.01). In contrast, the significantly highest values for these parameters were measured after pelleting without effect of grinding, resulting in a significant interaction between pelleting and grinding (p < 0.001). In Exp. 3, performance of chickens was not affected by dietary treatments, but gizzard weight and the PD of CP were higher when IS were included in the diet (p < 0.05). The results suggested that fine grinding may be used to increase the feeding value of full-fat rapeseed for broiler chickens. Nevertheless, pelleting of diets with rapeseed seemed to be much more effective in the reduction of particle size than grinding.

中文翻译：

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饲喂完整、磨碎和/或颗粒状油菜籽对肉鸡营养消化率和生长性能的影响

摘要 本研究评估了油菜籽研磨或制粒对肉鸡消化率、表观代谢能 (AMEN)、生长性能和胼胝重量的影响。在 Exp. 1，测试了四种处理（240 只肉鸡，20 次重复，每笼 3 只）。鸟类接受基础饮食或喂食不同大小颗粒的油菜籽（分别为细粒、中粒和粗粒）。在 Exp. 2、评估了 10 个处理（360 只鸡，12 次重复，每笼 3 只鸟），其中五种不同的饮食（基础饮食和四种分别含有完整油菜籽、细磨、中磨或粗磨油菜籽的饮食）饲喂非-颗粒状或颗粒状。在 Exp. 3、比较两种处理（224只肉鸡，14个重复，每层围栏8只鸡）：细磨油菜籽 (FG) 和完整油菜籽 (IS)。与中粗磨油菜籽相比，实验中细磨增加了。1 油菜籽的 AMEN 以及干物质和乙醚提取物 (EE) 的盲肠前消化率 (PD) (p < 0.05)。在 Exp. 2，当日粮未制成颗粒时，随着研磨程度的增加，AMEN的含量以及EE和粗蛋白（CP）的PD增加（p < 0.01）。相比之下，这些参数的显着最高值是在没有研磨影响的情况下在制粒后测量的，导致制粒和研磨之间存在显着的相互作用（p < 0.001）。在 Exp. 3、鸡的生产性能不受日粮处理的影响，但当日粮中加入IS时，鸡的胗重和CP的PD较高（p < 0.05）。结果表明，细磨可提高全脂油菜籽对肉鸡的饲喂价值。尽管如此，将油菜籽制成颗粒似乎比研磨更有效地减小颗粒尺寸。