P.E Andersen

TL;DR: Multiple regression analysis showed that the effect of protein on milk production was dependent on the energy intake and the mobilization of body reserves, and an additional 9–10 g crude protein per production feed unit was necessary to maximize the mobilize of the body reserves.

TL;DR: In early lactation, dietary CP and energy can profoundly affect milk yield, but current methods of assessing these nutrients are often inadequate to predict animal performance.

TL;DR: In dairy cows two distinct and important aspects of the interrelationship between protein and energy-yielding nutrients can be identified; that changing "protein" supply to tissues can alter the pattern and efficiency of absorbed nutrient use and that at high levels of feeding rumen microbial demand for nitrogen per unit fermentable organic matter is high.

TL;DR: The purpose of this review was to determine with accuracy the effect of the lactation stage, length of under/over-feeding, age and production potential of the animals on the milk output and milk protein content response to variations in the energy supply.

TL;DR: The model for the response of milk yield, protein yield, and protein content obtained in this trial made it possible to predict more accurately the variations in production and composition of milk relative to the potential of the cow because of changes in diet composition.