SITES OF ORGANIC MATTER AND PROTEIN DIGESTION IN LACTATING COWS FED FRESH GRASS FROM SPRING TO AUTUMN

Abstract

Broad seasonal variations in duodenal NAN flow were observed with lactating cows fed fresh ryegrass. Lower values were observed during summer when rumen ammonia might have been limiting and during autumn when protein degradability was likely high. Key words: Protein digestion, fresh grass, dairy cows, seasonal variations