Abstract
Impressive increases in the genetic potential of dairy cows have driven equally substantial improvements in management and nutrition. There appears to be a conflict between supplying the nutrient requirements of high yielding dairy cows and maintaining healthy rumen function. Research into optimising rumen function has demonstrated an incredible capacity for nutrient production given suitable rumen conditions. Nutrition models based on this research have been used to feed herds with average milk yields above 45 kg/cow/day with minimal loss of body condition, even on diets with crude protein concentrations below 15%. Such a diet requires exceptional rumen function to maximise microbial energy and protein production and demonstrates the significant advances in scientific understanding in recent years.
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