Adaptation to diets containing significant amounts of non-protein nitrogen

Effect of Dehydrated Pig Faeces in the Diet on Microbial Protein Synthesis and Fermentation Balance in the Rumen of Holstein Steers

“…l), which is in agreement with peak NH:,-N concentrations reported by other authors (Nikolic et al, 1980) with rations containing non-protein nitrogen (urea). I t has been suggested t h a t ruinen NH:,-N levels required to maximize microbial activity are within the range 5-2Smg/100 ml of rumen liquor with a minimum level of 5 mg/100 ml (Satter and Slyter, 1974).…”

“…Thus, the positive effect observed in the efficiency of microbial growth could be associated to a greater utilization of energy and to the concentration of CP in the ration. The presence of essential amino acids has been shown in DPF including lysine, threonine and methionine, as well as sulphur amino acids and o t h e r n i t r o g e n o u s c o m p o u n d s s u c h a s glutamine, creatinine, allantoin and purines (Nikolic et al, 1980), all of which may probably play a role as g r o w t h factors for r u m e n Pig fa,eces in diet of Holstein steers 21 microorganisms. In the present work, the true efficiency of microbial growth ( Table 2) was within the range (10 to 30g N/kg of OM truly fermented i n the r u m e n ) reported i n t h e l i t e r a t u r e .…”

The Rumen Microbial Ecosystem

“…The microbial population would probably have to adapt to these new substrates (Nikolic et al, 1980), but compounds like biuret, creatine, ammoniated molasses and glycosyl ureas could be useful (Schwartz, 1967;Chalupa, 1972;Merry et al, 1982). The microbial population would probably have to adapt to these new substrates (Nikolic et al, 1980), but compounds like biuret, creatine, ammoniated molasses and glycosyl ureas could be useful (Schwartz, 1967;Chalupa, 1972;Merry et al, 1982).…”

An Evaluation of Condensed Molasses Solubles (CMS) as a Source of Nitrogen for Ruminal Microbes In Vitro

“…Mahadevan et al (1976) reported that urease was not inhibited by ammonia concentrations between 1 mM and 40 mM which are values commonly found in rumen. Again, it was suggested that urease activity is generally more than sufficient to provide ammonia from urea rapidly enough for microbial protein synthesis (Nikolic et al, 1980). Such observations highlight the need to carefully evaluate in vitro incubations to establish their inherent limitations.…”