First you need to know what is the average daily milk production per Holstein cow. The figure below is average based on making sure your cow has decent nutrition and you follow best feeding management practices. If you do take care of your cows well, she should produce minimum of 60 pounds of 4% fat corrected milk.
Make sure you give them able space, It has been noticed that cows being put in tight areas produce lower quantities of milk. Ensure you have a wide area for keeping cows. Provide them with plenty of space to roam freely and this will affect the quantity of milk they produce.
You can get more milk out of cows by milking them several times a day. A healthy cow can be milked six to seven times in a single day. The more you milk a cow, the more milk it produces. However, you must be careful not to over-milk your cows, as this can result in sore utters and decrease the quantity of milk being produced. Milk the cow several times a day and if no milk comes, leave it.
Dehydration in cows can hugely effect the production of milk. You must provide plenty of water to cows and keep them well-hydrated all the time.
Provide more food to cows when they are pregnant and producing milk. Dry feed, specially being manufactured for dairy cows, is available in the market and it helps to provide appropriate nourishment. It is better to let your cows graze fresh grain but when it is not feasible, dry hay will also serve a good purpose.
Arrange for a good shelter to keep cows, protecting them from harsh weather, thunderstorms or hail. If your cows are facing inclement weather, their milk producing capacity lowers down significantly and there are also high chances for them to fall sick. The place where you keep your cows should be able to protect them from severe cold of winter or scorching heat of summer.
Younger cows have the tendency to produce more milk than older cows and hence, you should have as many young cows on your farm as possible.