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Evaluation of mathematical models to describe protein fraction degradation kinetics of various oilseed meals

Published online by Cambridge University Press:  22 November 2017

M Danesh Mesgaran ,
T Tashakkori ,
A Heravi Moussavi ,
S Danesh Mesgaran ,
A Vakili  and
A A Aslaminejad
M Danesh Mesgaran*
Affiliation:
Dept of Animal Science, Ecellence Centre for Animal Science, Ferdowsi University of Mashhad, Mashhad, Islamic Republic of Iran
T Tashakkori
Affiliation:
Dept of Animal Science, Ecellence Centre for Animal Science, Ferdowsi University of Mashhad, Mashhad, Islamic Republic of Iran
A Heravi Moussavi
Affiliation:
Dept of Animal Science, Ecellence Centre for Animal Science, Ferdowsi University of Mashhad, Mashhad, Islamic Republic of Iran
S Danesh Mesgaran
Affiliation:
Dept of Animal Science, Ecellence Centre for Animal Science, Ferdowsi University of Mashhad, Mashhad, Islamic Republic of Iran
A Vakili
Affiliation:
Dept of Animal Science, Ecellence Centre for Animal Science, Ferdowsi University of Mashhad, Mashhad, Islamic Republic of Iran
A A Aslaminejad
Affiliation:
Dept of Animal Science, Ecellence Centre for Animal Science, Ferdowsi University of Mashhad, Mashhad, Islamic Republic of Iran
*
Email: danesh@um.ac.ir
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Extract

In situ procedure is a direct method of measuring the rumen degradation kinetic of a feed nutrient. Data obtained by this technique are generally analysed using an exponential curve (Ørskov and McDonald, 1979). However, very low attention has been paid to choice of mathematical model to fit the curves and goodness-of-fit of the model. Lopez et al. (1999) pointed out that the disappearance of some feed components, particularly structural carbohydrates, exhibits a larger variety of forms than for crude protein (CP). In the present study, two different mathematical models of a straight line or a negative exponential (France et al., 1990; and Ørskov and McDonald, 1979) were selected to evaluate in situ degradation kinetics of protein fractions including true protein (TP), neutral-detergent insoluble protein (NDIP) and acid-detergent insoluble protein (ADIP) of various oilseed meals (cottonseed meal (CSM), soyabean meal (SM) and rapeseed meal (RM)).

Type
Theatre Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2009 , April 2009 , pp. 171
Copyright
Copyright © The British Society of Animal Science 2009

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References

France, J., Thornley, J. H. M., Lopez, S., Siddons, R. C., Dhanoa, M. S., Van Soest, P. J. and Gill, M. 1990. Journal of Theoretical Biology. 146, 269–287.Google Scholar
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