Dairying is one of the most challenging to most farmers when it comes to production. Farmers never get it right because mostly we fail to complete understand our dairy cattle hence in ability to exploit their genetic potential. Just to start you on, remember phonotypic expression (external appearance)e.g color doesn't necessarily translates to better production example the fact that the cow is black and white doesn't mean Friesian breed unless backed up by her breeding records. The point is the problem starts from where you got the cow from and whether her breeding records can be traced back to true breed. Assuming the breed is true to type, you must get your feeding , housing and milking procedures well in order to harvest good milk from your cow. Dairy cows are customized to routine hence stick to same milking procedures daily including never changing milkers and milking CAN or machine. Milk let down is both an art and science. Stimulate your animal well, give right feed, have good breed in good environment free from environmental stress and you will be smilling all the way to the bank.