female pigeon not layin eggs

Question
hi
  i am from Pakistan ,Lahore i'have some racer pigeons (local type ) the female pigeon r not laying eggs for three o four month i tried multi vitamin,Cal but no result

pls hlep me

Thanx

Answer
Hi, Salman,

I need more information about what is going on in order to help you.  Do your females have mates and have they mated?  What type of loft setup do you have and how are your birds housed in this setup?  You say "local type" pigeons, what does this mean?  Please provide as much detailed information as possible.  Thanks.

Chrys