Abstract
Rumen and total intestinal tract digestibility of protein and amino acids from different roughages, determined <i>in situ</i>
Highlights
The amino acids available for absorption in ruminants are derived from dietary protein which has escaped rumen degradation and from microbialSKIBA B
The degradability of crude protein has been used to predict the degradation of individual A A and their supply to the duodenum (Rulquin and Verite, 1993), results from some experiments suggest that the degradability of total A A can deviate from that of crude protein, and that variations in degradation can occur among individual amino acids (Susmel et al, 1989; Boila and Ingalls, 1994; Skorko-Sajko et al, 1994; Cozzi et al, 1995; Dakowski et al, 1996)
In the French system for prediction of lysine and methionine absorption (Rulquin and Verite, 1993), it is assumed that the A A profile of original feed protein is equal to the A A profile of undegraded feed protein, as found by Ganev et al (1979), Weakley et al (1983) and Teller et al (1985)
Summary
The amino acids available for absorption in ruminants are derived from dietary protein which has escaped rumen degradation and from microbialSKIBA B. Since the amount of microbial protein synthesized in the rumen is inadequate to fulfill the A A requirement for high producing cattle, the quantity of feed protein escaping rumen degradation and its amino acid composition, the amount of the most limiting amino acids, play an important role in covering an animal's A A requirements. Information on the digestibility of total and individual A A in different feed residues, which escaped degradation in the rumen, is still limited (Hvelplund and Hesselholt, 1987; Boila and Ingalls, 1994; Erasmus et a l , 1994; Skorko-Sajko et al, 1994). Reliable measures of RUDP, its A A content and intestinal digestibility are necessary
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