4151
In conclusion , feeding aged laying hens with diets containing increasing concentrations of Mg up to 3 . 0 g / kg improves eggshell strength , but has no detrimental effects on laying performance .
 Chemical: Mg
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Mg 
Answer:
 Chemical: Mg