Effect of dietary protein degradability on microbial protein supply to the small intestine of sheep
1999
Djouvinov, D. (Tracian University, Stara Zagora (Bulgaria))
Eight lambs were fed 3 experimental diets at 2 levels according to a balanced changeover design.The diets differed in the proportions of quickly (QDN), slowly (SDN) and digestible undegradable nitrogen(DUN) of total N (diets Q, S and U, respectively), and in rumen degradable N (RDN):fermentable metabolizable energy (FME) ratio.The efficiency of utilisation of effective rumen degradabl N for microbial N synthesis was 0.51, 0.95 and 0.46 for diets Q, S and U.The value of 0.51 for diet with high QDN content was lower than the AFRC prediction of 0.8.Diet S confermed the assumption that SDN can be incorporated into MN with efficiency 1.Feeding diet U led to reduction in food intake and digestibility, most likely due to their inability to sustain the microbial activity in the rumen.
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