Xiao Xiangyu, Zhu Yucheng, Deng Bohua, Wang Jiaojiao, Shi Shiyi, Wang Shaoshuai, Han Xiaoqing, Zhao Ling, Song Tongxing
College of Animal Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
Animals (Basel). 2023 Feb 14;13(4):662. doi: 10.3390/ani13040662.
This study aimed at investigating the effects of phytosterols on the productive performance, egg quality, length of small intestine, and tibia quality in aged laying hens. A total of 960 Dawu Jinfeng commercial laying hens (75 weeks of age) were randomly assigned to three groups. Each group had 16 replicates and every replicate contained four cages (five birds/cage). The control group hens received the basal diet without phytosterols. The hens in the experimental groups received a diet containing phytosterols at concentrations of 20 mg/kg and 40 mg/kg for 7 weeks. The results showed that phytosterols had a linearly increasing effect on egg weight, eggshell surface area, albumen height, and haugh unit at week 5 of experiment ( < 0.05). Supplemental phytosterols linearly and quadratically increased eggshell thickness ( < 0.05). At week 7 of the experiment, dietary supplementation of phytosterols linearly increased egg weight and eggshell weight ( < 0.05). Supplementation of 20 mg/kg, but not 40 mg/kg, phytosterols increased the length of the small intestine. However, dietary phytosterols had no effect on the laying rate, mortality, or liver index ( > 0.1). The results of tibia quality detected by micro-CT also showed no difference in the treatment of phytosterols. Therefore, supplementation with 20 mg/kg phytosterols in the diet improves egg quality and increases the length of small intestine, but has no effects on the quality of the tibia.
本研究旨在探讨植物甾醇对老龄蛋鸡生产性能、蛋品质、小肠长度及胫骨品质的影响。选取960只大午金凤商品蛋鸡（75周龄），随机分为三组。每组有16个重复，每个重复包含4个笼子（每个笼子5只鸡）。对照组母鸡饲喂不含植物甾醇的基础日粮。实验组母鸡分别饲喂含20 mg/kg和40 mg/kg植物甾醇的日粮，为期7周。结果表明，在试验第5周时，植物甾醇对蛋重、蛋壳表面积、蛋白高度和哈夫单位有线性增加作用（P<0.05）。添加植物甾醇使蛋壳厚度呈线性和二次增加（P<0.05）。在试验第7周时，日粮添加植物甾醇使蛋重和蛋壳重呈线性增加（P<0.05）。添加20 mg/kg植物甾醇可增加小肠长度，但40 mg/kg则无此作用。然而，日粮植物甾醇对产蛋率、死亡率或肝脏指数无影响（P>0.1）。微CT检测胫骨品质的结果也表明，植物甾醇处理组之间无差异。因此，日粮中添加20 mg/kg植物甾醇可改善蛋品质并增加小肠长度，但对胫骨品质无影响。
