We studied the metal-poor globular cluster populations of a large variety of galaxies and compared their mean metallicity with the properties of the host galaxies .
For this purpose , we constructed a comprehensive database of old , metal-poor globular cluster populations , hosted by 47 galaxies spanning about 10 magnitudes in absolute brightness .
The mean metallicities of the systems are found to be very similar and to lie in the -1.65 < [ Fe/H ] \leq - 1.20 range ( 74 % of the population ) .
Using only globular cluster systems with more than 6 objects detected , we find that 85 % of the population are within -1.65 < [ Fe/H ] \leq - 1.20 .
The relation between the mean metallicity of the metal-poor globular cluster systems and the absolute V magnitude of their host galaxies presents a very low slope which includes zero .
An analysis of the correlation of the mean metallicity of the populations with other galaxy properties ( such as velocity dispersion , metallicity , environment density ) also leads to the conclusion that no strong correlation exists .
The lack of correlation with galaxy properties suggests a formation of all metal-poor globular clusters in very similar gas fragments .
A weak correlation ( to be confirmed ) might exist between mean metallicity of the metal-poor clusters and host galaxy metallicity .
This would imply that at least some fragments in which metal-poor globular clusters formed were already embedded in the larger dark matter halo of the final galaxy ( as oppose to being independent satellites that were accreted later ) .
Our result suggests a homogeneous formation of metal-poor globular clusters in all galaxies , in typical fragments of masses around 10 ^ { 9 } - 10 ^ { 10 } M _ { \odot } with very similar metallicities , compatible with hierarchical formation scenarios for galaxies .

We further compare the mean metallicities of the metal-poor globular cluster populations with the typical metallicities of high redshift objects .
If we add the constraint that globular clusters need a high column density of gas to form , Damped Lyman \alpha systems are the most likely sites among the known high redshift objects for the formation of metal-poor globular cluster populations .