ive herd this rubbish before that jerseys arent fertile the reason for many is that a few jerseys are put in with a large amount of bigger breeds eg holstein the problem is if there grazed too hard the jerseys wont get time to eat enough trials have been done on this so the yield poorer and have poorer fertility i dont graze very hard and my pure jerseys are as fertile and some years more fertile than crossbreds.The reason i want to keep breeding a percentage of the herd pure is to see if theres much difference in yield a purebred is allways easier to manage.my daughters of vj link have an average 364 calving interval.My pure jerseys have all but died out for this very reason, bought two lovely danish ones but they had beef calves every year as I put a sweeper but in. Had 7 at one point, only one left now. In calf to AA