Digestion, absorption and utilization of single-cell protein by the preruminant XXXX . The true digestibility of milk and bacterial protein and the apparent digestibility and utilization of their constituent @entity1522 .

@entity1522 @entity1568 @entity3363 @entity535 @entity14569 @entity8664 @entity348 @entity460 @entity3151 @entity291 @entity369 @entity7443
Two experiments of Latin square design were made, each with four Friesian bull @entity291 fitted with re-entrant duodenal and ileal cannulas at 4-10 d of age. The @entity291 were used to study the effect of giving milk-substitutes containing 0, 300, 500 and 700 g bacterial protein (Pruteen)/kg total protein on apparent digestibility of @entity1568 fractions and @entity1522 and true digestibility of 3H-labelled milk protein and 35S-labelled bacterial protein in the small intestine. A third experiment of Latin square design with four intact Friesian @entity291 was used to measure apparent digestibility of nutrients throughout the alimentary tract and retention of N, @entity460 and @entity3151 . At the duodenum, volume of outflow, its pH, and outflow of @entity348 ( @entity7443 ), @entity8664 (NPN) decreased with time after feeding. At the ileum, volume of outflow and @entity7443 outflow were unaffected by time after feeding but @entity8664 outflow decreased; NPN outflow at the ileum increased to a maximum 6 h after feeding and then declined. Increased inclusion of Pruteen did not affect the volume of outflow at the duodenum or ileum, but duodenal @entity8664 outflow increased. At the ileum, pH values were lower and @entity7443 , @entity8664 and NPN outflows were higher with increasing concentration of Pruteen in the diet. Apparent digestibility in the small intestine tended to decrease with greater amounts of Pruteen, but was only significant for NPN. Apparent digestibility from mouth to ileum significantly decreased for @entity7443 and @entity8664 as Pruteen inclusion increased. @entity535 concentration in duodenal outflow, with the exception of that of @entity369 , reflected intake. The total amount of each @entity535 in ileal outflow increased and the apparent digestibility of most @entity1522 decreased with greater amounts of Pruteen in the diet. Apparent digestibility of nucleic acid-N from Pruteen was very high. True digestibility in the small intestine and between mouth and ileum of 3H-labelled milk protein was high and did not differ between dietary treatments. True digestibility of 35S-labelled Pruteen was low for the @entity14569 diet and tended to increase linearly as more dietary Pruteen was included. Dry matter concentration in faeces and a high apparent digestibility throughout the whole alimentary tract of @entity3363 did not differ between treatments.(ABSTRACT TRUNCATED AT 400 WORDS)
