Shao Yuxin, Wang Yangyang, Li Xing, Zhao Dongdong, Qin Shizhen, Shi Zhaoguo, Wang Zheng
Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China; Faculty of Animal Science and Technology, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China.
Poult Sci. 2023 Nov;102(11):102809. doi: 10.1016/j.psj.2023.102809. Epub 2023 May 25.
The purpose of this experiment was to explore the effects of zinc supplementation in breeding pigeons diet on carcass traits, meat quality, antioxidant capacity and mRNA expressions of myogenic regulatory factors of squabs. A total of 120 healthy White King pigeons were randomly assigned to 5 treatments, each involving 8 replicates. The experiment lasted for 46 d (18-d incubation period of eggs and 28-d growth period of squabs). The 5 groups were 0, 30, 60, 90, and 120 mg/kg zinc addition. Results showed that the 28-d body weight, breast muscle yield, zinc content in crop milk and myogenic factor 6 (MyF6) abundance of breast muscle were linearly increased (P < 0.050), but the abdominal fat yield linearly decreased (P = 0.040) with increasing dietary zinc supplementation. Both the linear (P < 0.050) and quadratic responses (P < 0.001) were observed in copper zinc superoxide dismutase (Cu-Zn SOD), total antioxidant capacity (T-AOC) and malondialdehyde (MDA) contents in liver and breast muscle. The 28-d body weight was increased by 90 mg/kg zinc supplementation (P < 0.05), and there is no significant difference between 90 and 120 mg/kg zinc addition. The breast muscle yield, Cu-Zn SOD and T-AOC contents in breast muscle and liver, zinc contents in crop milk and breast muscle, MyF6 mRNA expression in breast muscle were higher (P < 0.05) in the group supplemented with 120 mg/kg zinc than the control. The abdominal fat yield was numerically lowest, and MDA contents in breast muscle and liver were significantly lowest in the group fed 120 mg/kg zinc (P < 0.05). However, the meat quality traits were not affected (P > 0.05) by zinc supplementation, except for shear force. It should be stated dietary zinc supplementation at the level of 120 mg/kg for breeding pigeons increased body weight and breast muscle yield of squabs, which may be associated with the up-regulating MyF6 mRNA expression and antioxidant capacity in liver and breast muscle.
本实验旨在探讨种鸽日粮中添加锌对乳鸽胴体性状、肉质、抗氧化能力及生肌调节因子mRNA表达的影响。选取120只健康的白羽王鸽，随机分为5组，每组8个重复。实验为期46天（18天的蛋孵化期和28天的乳鸽生长期）。5组日粮锌添加量分别为0、30、60、90和120 mg/kg。结果表明，随着日粮锌添加量的增加，28日龄乳鸽体重、胸肌产量、鸽乳锌含量和胸肌生肌因子6（MyF6）丰度呈线性增加（P < 0.050），但腹脂产量呈线性下降（P = 0.040）。肝脏和胸肌中铜锌超氧化物歧化酶（Cu-Zn SOD）、总抗氧化能力（T-AOC）和丙二醛（MDA）含量均呈现线性（P < 0.050）和二次响应（P < 0.001）。添加90 mg/kg锌可提高28日龄乳鸽体重（P < 0.05），90和120 mg/kg锌添加组之间无显著差异。添加120 mg/kg锌组的胸肌产量、胸肌和肝脏中Cu-Zn SOD及T-AOC含量、鸽乳和胸肌锌含量、胸肌MyF6 mRNA表达均高于对照组（P < 0.05）。添加120 mg/kg锌组的腹脂产量在数值上最低，胸肌和肝脏中MDA含量显著最低（P < 0.05）。然而，除剪切力外，肉质性状不受锌添加的影响（P > 0.05）。应指出的是，种鸽日粮中添加120 mg/kg锌可提高乳鸽体重和胸肌产量，这可能与上调肝脏和胸肌中MyF6 mRNA表达及抗氧化能力有关。
