College of Animal Science and Technology, Anhui Agricultural University, Hefei, China.
Qingyang Pingyun Poultry Conservation and Breeding, Co. Ltd, Chizhou, China.
Anim Sci J. 2019 Jul;90(7):887-893. doi: 10.1111/asj.13220. Epub 2019 May 20.
This study was conducted to investigate the effects of free-range system (FRS) and conventional cage-rearing system (CRS) on growth performance, carcass yield, meat quality, lymphoid organ indices, and serum biochemistry of Wannan Yellow chickens. At 56 days of age, a total of 640 male chickens were randomly allocated to FRS and CRS groups, each of which included 4 replicates with 80 chickens in each replicate. The experiment lasted from 56 to 112 days of age. The results showed that CRS chickens exhibited better final body weight, average daily feed intake, average daily gain, and feed conversion ratio, whereas FRS chickens showed better breast and leg yields, shear force, meat color, lower drip loss, and decreased abdominal fat deposition. Moreover, the absolute thymus weight and thymus to body weight ratio of FRS birds were significantly higher than those of CRS birds (p < 0.05). Additionally, FRS chickens had significantly reduced glucose, total protein, triglyceride, and cholesterol contents, but enhanced levels of high-density lipoprotein cholesterol (p < 0.05). In conclusion, the FRS has advantages in breast and leg yields, meat quality, and some serum biochemical parameters of Wannan Yellow chickens, whereas it has negative effects on growth performance.
本研究旨在探讨自由放养系统（FRS）和传统笼养系统（CRS）对皖南黄鸡生长性能、屠体产率、肉质、免疫器官指数和血清生化指标的影响。在 56 日龄时，将 640 只雄性鸡随机分配到 FRS 和 CRS 组，每组包括 4 个重复，每个重复 80 只鸡。试验从 56 日龄持续到 112 日龄。结果表明，CRS 鸡表现出更好的末重、平均日采食量、平均日增重和饲料转化率，而 FRS 鸡表现出更好的胸肌和腿肌产率、剪切力、肉色、较低的滴水损失和减少的腹部脂肪沉积。此外，FRS 鸟类的绝对胸腺重量和胸腺与体重比显著高于 CRS 鸟类（p<0.05）。此外，FRS 鸡的葡萄糖、总蛋白、甘油三酯和胆固醇含量显著降低，但高密度脂蛋白胆固醇水平升高（p<0.05）。综上所述，FRS 对皖南黄鸡的胸肌和腿肌产率、肉质和一些血清生化参数具有优势，但其生长性能较差。
