Abstract
New schemes describing the protein nutrition of ruminants consider both host and microbe requirements for nitrogenous compounds, truly absorbed amino N (TAAN) and rumen degradable N (RDN) respectively. This has made the prediction of the energetic efficiency of rumen microbial protein yield (E,MiN) crucial. However there is little guidance concerning the prediction of E,MiN since there are few consistent relationships in the literature. We face the dilemma that current techniques for measuring E,MiN are costly, invasive and laborious which makes it difficult to conduct large, designed and replicated experiments to investigate sources of variation. We have adopted the much simpler techniques of measuring urinary allantoin excretion to investigate sources of variation in E,MiN. Our objective was to investigate effects on E,MiN of varying rumen outflow rates by nutritional (level of intake and diet digestibility), and non-nutrition (supplementary NaHCO3) methods.
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Schedule a callMore From: Proceedings of the British Society of Animal Production (1972)
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