I have been a herd manager and dairy nutritionist and i studied a few of the top production herds in America and they pretty much followed exactly what this herd does. Tye one herd I did nutritionist work for we averaged 106 to 115 lbs per cow and it was a pretty basic diet with high quality feed, alot of high chop BMR, 170rfv alfalfa, hmsc, rumensin, half a lb of hi palm fat, fed sugar via whey mixed 3x and had 10 day bst at the time now no bst. The main difference is that the cows DMI is high, making alot of milk is all about hetting dmi and feed efficientcy up and the foundation for that are dam good genetics and then management that allows for the cows to milk to tyeir potential. I managed a 120 cow jersey herd almost 10 years ago that had really good genetics but the prior manager was pretty bad, when i got their we where at 50-52 lbs milk within a year with mich better forage lower DIM, better cow health and comfort we where in the mid to high 70s with the same components without any bst. I think with bst and some more fine tuning I could of had them up to 90 lbs. Its very fun fine tuning a herd to obtain their potential!