ABSTRACT

1. The aim of the present study was to investigate increasing amount of n-3 fatty acids (FA) in common edible chicken meat cuts by testing different levels of extruded linseeds (LS) and rapeseed oil in growing and finishing diets. Another challenge was to replace a part of soybean meal by faba beans.

2. For that purpose, 3168, one-day-old Hubbard JV15 strain chickens were distributed into six groups: R1 = control diet, R2 = 3% then 5% LS, R3 = 4% then 6% LS, R4 = 5% then 7% LS, R5 = 3% then 5% LS and a low amount of soybean meal in the finishing diet and R6 = 3% then 5% LS and no soybean meal in the finishing diet. The growing performance was recorded throughout the trial. At 30 days of age, all chickens were slaughtered in a commercial slaughter plant at an average weight of 1322 g, to mirror the production of low body weight ‘broiler griller’ birds commonly available for export markets. Thirty carcases per group were processed to determine cut yields. The edible parts from each half carcase were removed to determine the chemical composition and fatty acid composition of meat with skin. The sensorial quality of thighs was evaluated for 20 carcases per group, after roasting. The environmental and economic impacts of the feeding programmes were further evaluated.

3. This study showed that it was possible to replace a part of the soybean meal in finishing diet by faba beans and to enrich meat with n-3 FA of broiler meat portions without altering growth performance, carcase composition and sensorial quality of meat. The environmental impact was reduced by these dietary interventions, whereby climate change parameters, expressed as kg CO₂ eq./T, and phosphorus and fossil energy consumption were lower, but the land occupation was increased. The extra feed cost was +3 to +8% for groups fed R2 to R6 compared to the control group R1.

 抽象的

1. 本研究的目的是通过测试生长和肥育日粮中不同含量的挤压亚麻籽 (LS) 和菜籽油，调查常见食用鸡肉块中 n-3 脂肪酸 (FA) 含量的增加。另一个挑战是用蚕豆代替部分豆粕。

2. 为此，将 3168 只一日龄 Hubbard JV15 品系鸡分为六组：R1 = 对照饮食，R2 = 3% 然后 5% LS，R3 = 4% 然后 6% LS，R4 = 5%然后 7% LS，R5 = 3%，然后在育肥日粮中添加 5% LS 和少量豆粕，R6 = 3%，然后在育肥日粮中添加 5% LS，并且不含豆粕。在整个试验过程中记录了不断增长的表现。 30 日龄时，所有鸡均在商业屠宰场屠宰，平均重量为 1322 克，以反映出口市场上常见的低体重“肉鸡烧烤”禽类的生产。每组加工三十个屠体以确定产量。去除每半胴体的可食用部分，测定带皮肉的化学成分和脂肪酸成分。烘烤后，对每组 20 个胴体大腿的感官质量进行评估。进一步评估了喂养计划的环境和经济影响。

3. 本研究表明，用蚕豆替代精加工日粮中的部分豆粕，并用肉鸡肉部分的 n-3 FA 丰富肉质，而不改变肉的生长性能、胴体成分和感官品质。这些饮食干预措施减少了环境影响，气候变化参数（以kg CO ₂ eq./T表示）、磷和化石能源消耗降低，但土地占用增加。与对照组 R1 相比，饲喂 R2 至 R6 的组的额外饲料成本为 +3% 至 +8%。