Effects of Dietary Vitamins C and E on Egg Shell Quality of Broiler Breeder Hens Exposed to Heat Stress
Effects of Dietary Vitamins C and E on Egg Shell Quality of Broiler Breeder Hens Exposed to Heat Stress
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日粮维生素 C 和 E 对热应激肉种鸡蛋壳质量的影响
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
K. Chee
中科院分区：
文献类型：
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作者：
M. Chung;J. Choi;Y. Chung;K. Chee
进行了一项饲喂试验，以确定膳食维生素 C（200 毫克/千克）和维生素 E（250 毫克/千克）是否可以防止肉种鸡在热应激下蛋壳质量下降。 160 只 83 周龄时蜕皮的罗斯肉种鸡被随机饲养在一个单独的笼子里。对 40 只母鸡进行 4 次饮食治疗，每次治疗重复 4 次，分别为对照（不添加维生素）、补充维生素 C 或维生素 E 以及联合补充两种维生素。在 25°C 的十天适应期后，环境温度保持在 32°C，为期三周的测试期。产蛋量在一周内急剧下降，但各处理之间没有显示出显着变化（p<0.05）。然而，在热应激期间，饲喂复合维生素 C 和 E 的禽类的蛋质量参数，如蛋重、比重、蛋壳厚度、SWUSA、穿刺力和破壳强度均显着高于对照组（p<0.05）。饲喂维生素 C 日粮的母鸡提高了胫骨断裂强度（37.16 公斤），统计上高于饲喂对照和维生素 E 日粮的母鸡（p<0.05）。饲喂对照饮食的母鸡表现出比其他处理组更高的血清皮质酮水平，平均为 5.97 ng/ml（p<0.05）。热应激导致血清中异嗜细胞升高和淋巴细胞减少，从而增加了所有治疗的 H/L 比率。然而，通过单独饲喂含有维生素C或与维生素E一起饲喂的日粮，H/L比值的增加得到缓解，尽管两组之间的比值没有显着差异（p<0.05）。总之，在肉种鸡日粮中添加维生素C（200毫克/千克）和/或维生素E（250毫克/千克）可以防止高压力环境温度下蛋壳质量和胫骨强度的下降。 （亚洲-澳大利亚动物科学杂志，2005 年。第 18 卷，第 4 期：545-551）
A feeding trial was conducted to determine whether dietary vitamin C (200 mg/kg) and vitamin E (250 mg/kg) prevent any drops in egg shell quality under heat stress in broiler breeder hens. One hundred and sixty molted Ross broiler breeders were housed randomly in an individual cage at 83 weeks of age. Four dietary treatments with forty hens and four replications per treatment were control (no additional vitamins), vitamin C-, or vitamin E-supplemented and combined supplementation of the two vitamins. After a ten- day-adaptation period at 25°C, the ambient temperature was kept at 32°C for a three-week-testing period. Egg production dropped dramatically over week but it did not show a significant change among treatments (p<0.05). However, egg quality parameters such as egg weight, specific gravity, shell thickness, SWUSA, puncture force and shell breaking strength from the birds fed the diet with the combined vitamins C and E were significantly improved over those of the control group during the heat stress period (p<0.05). The hens fed the vitamin C diet improved tibia breaking strength (37.16 kg), statistically higher than the birds fed the control and the vitamin E diets (p<0.05). The hens fed the control diet showed higher serum corticosterone levels, a mean of 5.97 ng/ml, than those of the other treatments (p<0.05). The heat stress resulted in elevated heterophils and decreased lymphocytes in serum, increasing the H/L ratios for all the treatments. However, the increases in H/L ratios were alleviated by feeding the diets containing vitamin C alone or together with vitamin E, although there were no significant differences in the ratio between the two groups (p<0.05). In conclusion, vitamins C (200 mg/kg) and/or E (250 mg/kg) supplemented to the diets for broiler breeder hens could prevent drops in egg shell quality and tibia bone strength under highly stressful environmental temperatures. (Asian-Aust. J. Anim. Sci. 2005. Vol 18, No. 4 : 545-551)