Protein degradability of some concentrate feeds used in dairy cow nutrition

Abstract

Protein degradibility in concentrates and by-products commonly used was determined by the in situ method on two ruminally cannulated lactating cows. The investigated feeds and their effective protein degradability at a rumen outtlow rate od 5% per hour were: wheat bran - 44,6%; maize meal - 37.1% oat meal - 40.6%; soybean meal - 42.1%; sunflower meal - 68.8%; dried sugar beet pulp 21.2%; pea grain - 62.4%; faba bean grain - 47.1%. The results for maize and sunflover meals are in agreement with those of other authors but most feeds had a somewhat lower protein degradability than expected.