I want to know if there are formulas for estimating microbial nitrogen synthesis using urinary excretion of purine derivative in goats. Gomez and Chen 1992 gave the formulas for this in cattle and sheep.
This has been modelled in dairy goats. It also seem that of sheep may be used for goats. A study by Belenguer et al., 2002 actually found similar relationship between duodenal flow and urinary excretion of purines in goat and sheep. However it needs to be clarified if such holds true for other classes of goat. See attachment.
This paper may help you: J Anim Sci 2004. 82:2023-2032 Ruminal fermentation and degradation patterns, protozoa population, and urinary purine derivatives excretion in goat
At the moment there is none; so we only rely on sheep data to infer on microbial protein supply in goats. Assumptions concerning sheep data is table the digestion and absorption nucleic acids are similar; the metabolism of nucleic acid and the excretion of purine derivative are similar; these are still assumptions and are used without proof.
Otherwise, the NRC equations or the AFRC (1994) equation would help you to estimate microbial protein supply in goats.
Many thanks for suggestions and contributions. From all indications, the formula used for sheep can as well be adopted for goats. I will appreciate if Prof Nsahlai can send me a copy of an article where I can obtain the AFRC 1994 equation.
Dear,
please find the following attachments which may be helpful
1. Belenguer, A., Yanez, D., Balcells, J., Baber, N. O., & Ronquillo, M. G. (2002). Urinary excretion of purine derivatives and prediction of rumen microbial outflow in goats. Livestock Production Science, 77(2), 127-135.
Dear Dr Olafadehan,
Although not specific to goats, following 2 articles might interest you.
Regards,
Mahesh
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