Mother hen aggressive to black chicks

[Lisa_123]

Pekin bantam has hatched out 11 of 13 eggs. 6 black and 5 white. We put the heating lamp in with her, in two big boxes, with room for all to move about. Day 5 have noticed that she is pecking at the black chicks especially when feeding, passing all the white chicks to get to the black chicks. Any particular reason for this?? Black chicks running away from her. Hen even trying to get under what lamp to get at the black chicks. This is strange. Is this normal?

 

[sourland]

Has she raised chicks before, and if so were they all white? Hens sometimes remember and discriminate against chicks that are 'different' than their first brood.

 

[Lisa_123]

Has she raised chicks before, and if so were they all white? Hens sometimes remember and discriminate against chicks that are 'different' than their first brood.

No she is a first time mother