Institute of Animal Science, Gannan Academy of Sciences, Ganzhou, 341401, China.
Institute of Animal Husbandry and Veterinary Science, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China.
Animal. 2021 Feb;15(2):100081. doi: 10.1016/j.animal.2020.100081. Epub 2020 Dec 10.
Recent studies have shown that chromium (Cr) could alleviate the negative effects of heat stress on livestock and poultry, but there is little information available to laying ducks. This study aimed to investigate the effects of dietary addition of chromium propionate on laying performance, egg quality, serum biochemical parameters and antioxidant status of laying ducks under hot (average 32 °C) and humid (average 75% relative humidity) summer conditions. A total of 900 66-week-old weight- and laying-matched Shanma laying ducks were randomly divided into five treatments, each with 6 replicates of 30 individually caged birds. The birds were fed either a basal diet or the basal diet supplemented with either 200, 400, 600, or 800 μg/kg Cr as chromium propionate. All laying ducks were given feed and water ad libitum for 5 weeks. The results showed that dietary supplementation with chromium propionate significantly increased the laying rate and yolk colour score (P < 0.05). Treatment with 400 μg/kg Cr as chromium propionate significantly decreased the feed/egg ratio by 5.4% (P < 0.05). Increased supplemental Cr from 0 to 800 μg/kg resulted in an increase in albumen height and the Haugh unit linearly (P < 0.05). Increased supplemental Cr decreased serum cortisol (P < 0.001, linear; P = 0.008, quadratic), heat shock protein-70 (P < 0.001, linear; P = 0.007, quadratic) and glucose (P = 0.007, linear), whereas it increased serum insulin (P = 0.011, Linear), total protein (P = 0.006, linear; P = 0.048, quadratic) and albumin (P = 0.035, linear; P = 0.088, quadratic). Dietary Cr levels increased the activities of superoxide dismutase and glutathione peroxidase, the total antioxidant capacity linearly and quadratically (P < 0.05). A linear and quadratic (P < 0.05) decrease of the malondialdehyde concentrations in response to dietary Cr level was observed. These results indicated that dietary supplementation of Cr as chromium propionate, particularly at 800 μg/kg could beneficially affect the laying rate, egg quality and antioxidant function, as well as modulate the blood biochemical parameters of laying ducks under heat stress conditions.
最近的研究表明，铬（Cr）可以减轻热应激对家畜和家禽的负面影响，但关于产蛋鸭的信息却很少。本研究旨在探讨在炎热（平均 32°C）和高湿（平均 75%相对湿度）夏季条件下，饲粮添加丙酸铬对产蛋鸭生产性能、蛋品质、血清生化参数和抗氧化状态的影响。将 900 只 66 周龄体重和产蛋量相近的山马产蛋鸭随机分为 5 个处理组，每个处理组设 6 个重复，每个重复 30 只单笼饲养。对照组饲喂基础日粮，试验组在基础日粮中分别添加 200、400、600、800μg/kg 的丙酸铬。所有产蛋鸭自由采食和饮水 5 周。结果表明，饲粮添加丙酸铬显著提高了产蛋率和蛋黄颜色评分（P<0.05）。添加 400μg/kg 丙酸铬可使料蛋比降低 5.4%（P<0.05）。Cr 从 0 增加到 800μg/kg，蛋白高度和哈夫单位呈线性增加（P<0.05）。添加更多的 Cr 可降低血清皮质醇（P<0.001，线性；P=0.008，二次）、热休克蛋白 70（P<0.001，线性；P=0.007，二次）和葡萄糖（P=0.007，线性），而血清胰岛素（P=0.011，线性）、总蛋白（P=0.006，线性；P=0.048，二次）和白蛋白（P=0.035，线性；P=0.088，二次）水平则增加。Cr 水平的增加可使超氧化物歧化酶和谷胱甘肽过氧化物酶的活性、总抗氧化能力呈线性和二次增加（P<0.05）。丙二醛浓度随饲粮 Cr 水平的线性和二次降低（P<0.05）。这些结果表明，饲粮添加丙酸铬，特别是 800μg/kg 可对热应激条件下产蛋鸭的产蛋率、蛋品质和抗氧化功能产生有益影响，并调节血液生化参数。
