Key Laboratory of Animal Genetics and Breeding and Molecular Design of Jiangsu Province, Yangzhou University, Yangzhou 225009, China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou, Jiangsu 225009, China.
Key Laboratory of Animal Genetics and Breeding and Molecular Design of Jiangsu Province, Yangzhou University, Yangzhou 225009, China.
Poult Sci. 2020 Apr;99(4):2011-2016. doi: 10.1016/j.psj.2019.09.006. Epub 2020 Feb 28.
The present study was conducted to evaluate the effects of different rearing methods and stocking densities on carcass yield and proximate composition of meat in small-sized meat ducks. A total of 555 one-day-old birds were randomly allocated to six treatment groups (three replicates per treatment, sex ratio 1/1) with a 2 × 3 factorial arrangement of two rearing methods (reared in cage or net) and three stocking densities (5 [low], 7 [medium], or 9 [high] birds/m) until day 70. Five male and five female birds from each replicate were randomly selected and processed to determine the carcass yield. Proximate composition was determined by proximate analysis using the breast and thigh muscles. There was no interaction effect between the rearing method and stocking density on carcass yield. The rearing method affected the thigh muscle rate, which was higher in the cage groups (P < 0.05). The final BW and abdominal fat rate decreased with increasing density (P < 0.05), whereas the thigh muscle rate increased (P < 0.05). There were significant interaction effects (P < 0.05) between the rearing method and stocking density on the content of protein, fat, and collagen. The content of fat and moisture was greater and lower, respectively, in the cage groups (P < 0.05). The content of moisture, fat, and collagen with a medium density was higher (P < 0.05). In addition, the content of protein and fat was lower in the ducks fed in nets at low and high densities (P < 0.05), respectively; the collagen content of breast and thigh muscle was lower in the ducks fed in cages and nets, respectively, at a low density (P < 0.05). Our findings provide valuable insights into the single and interactive effects of the rearing method and stocking density on duck slaughter performance and proximate composition of meat. The results indicate that a rearing system with a cage pattern and a medium density is better than other arrangements for small-sized meat ducks.
本研究旨在评估不同饲养方式和饲养密度对小型肉鸭屠体产率和肉品 proximate 组成的影响。将 555 只 1 日龄雏鸭随机分配到 6 个处理组（每个处理组 3 个重复，雌雄比例为 1/1），采用 2×3 因子设计，分别为两种饲养方式（笼养或网养）和三种饲养密度（5[低]、7[中]或 9[高]只/m2），直至 70 日龄。每个重复中随机选择 5 只雄性和 5 只雌性进行屠宰，测定屠体产率。通过使用胸肌和腿肌进行 proximate 分析来测定 proximate 组成。饲养方式和饲养密度对屠体产率没有互作效应。饲养方式影响腿肌率，笼养组较高（P<0.05）。随着密度的增加，终体重和腹脂率降低（P<0.05），而腿肌率增加（P<0.05）。饲养方式和饲养密度对蛋白质、脂肪和胶原蛋白含量有显著的互作效应（P<0.05）。笼养组的脂肪和水分含量较高（P<0.05），而网养组的蛋白质和水分含量较高（P<0.05）。此外，低和高密度网养组的蛋白质和脂肪含量较低（P<0.05），低密度笼养组的蛋白质和脂肪含量较低（P<0.05）。本研究结果为饲养方式和饲养密度对鸭屠宰性能和肉品 proximate 组成的单一和交互影响提供了有价值的见解。结果表明，笼养模式和中等密度的饲养系统比其他饲养方式更适合小型肉鸭。
