OPINION: Big litters and pre-weaning mortality

Many people think that there is a relationship between big litters and pre-weaning mortality, and some salve their conscience when using it as a reason for their continuing pre-weaning mortalities of 10% -12%. While others, continuing to enjoy equally large litters from using the new genetics, have got mortality down to only 6%. Recent information coming my way from both groups of clients suggest this needs some ?discussion. Are birth weights involved? One group of opinion thinks that extra larg