ORIGINAL PAPER
Evaluation of three rape seed commodities in the rumen of steers
1. Degradation of dry matter and crude protein
and disappearance of amino acids in situ
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Institute of Animal Nutrition, Physiology and Metabolism,
Christian-Albrechts-University,
D-24098 Kiel, Germany
Publication date: 1997-02-06
J. Anim. Feed Sci. 1997;6(1):23-40
KEYWORDS
ABSTRACT
Ruminal degradation characteristics of rape seed and of untreated and formaldehyde-treated
rapeseed meals containing less than 8 µmol of total glucosinolates per gram of dry matter were
investigated. Feeds were incubated in polyester bags in the rumen of three fistulated steers for 0, 2, 4, 8, 16, 24 and 48 h. The rate and extent of degradation of dry matter and crude protein and
disappearance of amino acids from polyester bags were determined. The crude protein was more
degradable than the dry matter of rape seed and untreated rapeseed meal, whereas the opposite was
observed for the formaldehyde-treated rapeseed meal. The treatment of the rapeseed meal with
formaldehyde greatly reduced the rate and extent of dry matter and crude protein degradation
compared with the untreated meal. Effective degradabilities of dry matter and crude protein declined
in the following order: rape seed > untreated rapeseed meal > formaldehyde-treated rapeseed meal.
The effective degradabilities of crude protein at assumed ruminal passage rates of 2, 5 and 8%/h
ranged from 77 to 62% for the rape seed, 76 to 51% for the untreated meal and 39 to 16% for the
formaldehyde-treated meal. With increasing exposure time to the rumen, the amino acid profile of
undegraded residues of rape seed and of untreated rapeseed meal changed. As a result, large
differences among amino acids were observed for percentages of disappearance from the bags.
Treatment of rapeseed meal with formaldehyde was effective in preserving the amino acid
composition of the undegraded feed protein.
CITATIONS (3):
1.
Wool growth in Merino wethers fed lupins untreated or treated with heat or formaldehyde, with and without a supplementation of rumen protected methionine
M. Rodehutscord, P. Young, N. Phillips, C.L. White
Animal Feed Science and Technology
2.
Estimating ruminal crude protein degradation with in situ and chemical fractionation procedures
S. Shannak, K.-H. Südekum, A. Susenbeth
Animal Feed Science and Technology
3.
Amino Acid Profile of Escaped Feed Protein After Rumen Incubation and Their Intestinal Digestibility
Zuzana Čerešňáková, A. Sommer, Mária Chrenková, Patrícia Dolešová
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