define parameters of high milk yield and the nutritional requirements to achieve the high milk yield.
This question has not a single answer.
Milk yield depends not only on nutritional regime but also on genetic merit, environmental conditions, body condition at the beginning of the lactation, etc. NRC and INRA give comprehensive methods to estimate requirements of dairy cows. The rationing would also depend on the ingredients (forages and concentrates) available for you.
Itis known that many factors affecting mill yield including genotype feeding , body condition of the cow and environmental temperture so you have to study which factorn or fsctors to maximize milk yield
Using the appropriate level of CP and natural addive in diet to produce healthy cow and functional milk and its products.
It depends on different factors like feed, climstic conditions, cattle age, and health. But overall, one solution is to give them proper feeds as per age and milking efficiency.