Organic trace minerals improve eggshell quality by improving the eggshell ultrastructure of laying hens during the late laying period
文献类型： 外文期刊
作者： Qiu, J. L. 1 ; Zhou, Q. 1 ; Zhu, J. M. 1 ; Lu, X. T. 1 ; Liu, B. 1 ; Yu, D. Y. 1 ; Lin, G. 3 ; Ao, T. 4 ; Xu, J. M. 5 ;
作者机构： 1.Zhejiang Univ, Key Lab Anim Nutr & Feed East China, Minist Agr, Hangzhou 310058, Peoples R China
2.Zhejiang Univ, Coll Anim Sci, Hangzhou 310058, Peoples R China
3.Chinese Acad Agr Sci, Inst Qual Stand & Testing Technol Agr Prod, Beijing 10081, Peoples R China
4.Alltech, Ctr Appl Nutrigen & Appl Anim Nutr, Nicholasville, KY 40356 USA
5.Zhejiang Univ, Coll Life Sci, Hangzhou 310058, Peoples R China
关键词： organic trace mineral; performance; eggshell quality; serum index; laying hen
期刊名称：POULTRY SCIENCE （ 影响因子：3.352； 五年影响因子：3.679 ）
ISSN：
年卷期： 2020 年 99 卷 3 期
页码：
收录情况： SCI
摘要： The objective of this study was to investigate the effects of low inclusion levels of organic trace minerals (iron, copper, manganese, and zinc) on performance, eggshell quality, serum hormone levels, and enzyme activities of laying hens during the late laying period. A total of 405 healthy hens (HY-Line White, 50-week-old) were randomly divided into 3 treatments, with 9 replications per treatment and 15 birds per replication. The dietary treatments included a basal diet supplemented with inorganic trace minerals at commercial levels (CON), a basal diet supplemented with inorganic trace minerals at 1/3 commercial levels (ITM), and a basal diet supplemented with proteinated trace minerals at 1/3 commercial levels (TRT). The trial lasted 56 D (8 wk). Compared with the CON group, the ITM group showed decrease in (P < 0.05) egg production, eggshell strength, eggshell palisade layer, palisade layer ratio, serum estrogen, luteinizing hormone, glycosaminoglycan concentration, and carbonic anhydrase activity and increase in (P < 0.05) egg loss and mammillary layer ratio. However, the TRT group almost kept all the indices close to the CON group (P > 0.05). Furthermore, hens fed with low inclusion levels of organic trace minerals had smaller mammillary knobs (P < 0.05) than those in the CON and ITM groups. In conclusion, hens fed with low inclusion levels of proteinated trace minerals had better performance and eggshell strength than those fed with identical levels of inorganic compounds; organic trace minerals improved eggshell quality by improving the eggshell ultrastructure of laying hens during the late laying period.
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