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Effects of processing on rumen degradabilities of soyabean meal, and low and high glucosinolate rapeseed meals in cattle

Published online by Cambridge University Press:  24 November 2017

A.M. Subuh
Affiliation:
Department of Animal Husbandry, University of Liverpool, Veterinary Field Station, Leahurst, Neston, L64 7TE
T.G. Rowan
Affiliation:
Department of Animal Husbandry, University of Liverpool, Veterinary Field Station, Leahurst, Neston, L64 7TE
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Extract

The effects of methods of processing soyabean meal (SBM), and low (LRSM) and high (HRSM) gluco-sinolate rapeseed meals on rumen degradability (DG) of dry matter (DM) and nitrogen (N), were determined by the nylon bag method in experiments of Latin Square design with 4 rumen-fistulated heifers. Rumen fractional outflow rates (FOR) for untreated SBM, LRSM and HRSM were determined by the chromium-mordant method in 2 heifers. Effective rumen degradabilities (EDG) for rumen incubation times of 24 h were calculated from DG and FOR.

Methods of processing were formaldehyde (FT, 0.8g HCH0/I6g N), heat (HT, 110°C for 2 h) and untreated (UT). Heifers were given a basal diet of hay (0.55 of DM intake) and mineralized barley with LRSM (0.45 of DM intake). The diet was offered twice a day at 08.00 and 16.00 hours. An adaptation period of four weeks preceded the experiments.

Type
Rumen Metabolism
Copyright
Copyright © The British Society of Animal Production 1992

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References

Ørskov, E.R. and McDonald, I. 1979. Journal of Agricultural Science (Cambridge), 92: 449503 Google Scholar