Question: query regarding decrease growth of some local piglet 
Answer: use of  thanthalmintc  at proper time -- for local pig / inject iron  in required amount / swine fever vaccine at 2-3 month of age / improve managemental practice  , multi vitamine , liver tonic should be given from time to time to obtain optimum growth of local pig / growth promoter  like biospark-v yo the piglet if required /