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Effects of zinc methionine supplementation on laying performance, zinc status, intestinal morphology, and expressions of zinc transporters' mRNA in laying hens
Author(s) -
Li Lanlan,
Li Huaiyu,
Zhou Wenting,
Feng Jie,
Zou Xiaoting
Publication year - 2019
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.9941
Subject(s) - jejunum , zinc , duodenum , zoology , methionine , kilogram , crypt , ileum , metallothionein , biology , medicine , basal (medicine) , endocrinology , chemistry , biochemistry , body weight , organic chemistry , amino acid , insulin
BACKGROUND This study was conducted to investigate effects of dietary zinc methionine (Zn‐Met) supplementation on laying performance, zinc (Zn) status, intestinal morphology, and Zn transporters in laying hens compared with zinc sulfate (ZnSO 4 ). A total of 384 Hyline Grey laying hens (38 weeks old) with similar performance (1.42 ± 0.07 kg) were randomly allotted to four dietary treatments and fed with a basal diet (control) or the basal diet supplemented with Zn, either as Zn‐Met at 40 and 80 mg Zn/kilogram diet or as ZnSO 4 at 80 mg Zn/kilogram diet, for 10 weeks. RESULTS There was no difference in egg weight, egg production, feed intake, and feed conversation ratio among all groups ( P > 0.05). Compared with the control, Zn contents were increased ( P < 0.05) in the liver, duodenum, and jejunum of laying hens fed diets supplemented with different Zn sources. There was no difference ( P > 0.05) in Zn contents in liver, duodenum, and jejunum between diets supplemented with Zn‐Met or ZnSO 4 at 80 mg Zn/kilogram diet. Compared with the control and the ZnSO 4 group (80 mg Zn/kilogram diet), supplementation with Zn‐Met of 80 mg Zn/kilogram diet increased ( P < 0.05) villus height, villus area, and villus height/crypt depth ratio but reduced ( P < 0.05) crypt depth in jejunum. Expression of metallothionein messenger RNA of jejunum in the group fed a diet containing Zn‐Met (80 mg Zn/kilogram diet) was higher ( P < 0.05) than that in the control. CONCLUSION These results indicated that Zn‐Met has positive effects on the Zn status of liver, duodenum, and jejunum, intestinal morphology, and metallothionein messenger RNA expression in jejunum of laying hens compared with ZnSO 4 . © 2019 Society of Chemical Industry