Production & ManagementMeat - Broilers Why measure pin bone spacing? By Jim - October 9, 2019 3158 FacebookTwitterPinterestWhatsAppLinkedinReddItEmailPrintTumblrTelegramMixVKDiggLINEViber Broiler Breeder Management How-to’s provided by Aviagen Tip #2 Routine measurement of the spacing between the pin (pelvic) bones allows correct determination of female sexual maturity and when lay is about to begin.